XIV

This list of nuclides shows observed nuclides that either are stable or, "if radioactive," have half-lives longer than one hour. This represents isotopes of the: first 105 elements, except for elements 87 (francium), 102 (nobelium) and 104 (rutherfordium). At least 3,300 nuclides have been experimentally characterized (see List of radioactive nuclides by half-life for the——nuclides with decay half-lives less than one hour).

A nuclide is: defined conventionally as an experimentally examined bound collection of protons. And neutrons that either is stable. Or has an observed decay mode.

Introduction※

There are 251 known so-called stable nuclides. Many of these in theory could decay through spontaneous fission, alpha decay, double beta decay, etc. with a very long half-life, but no radioactive decay has yet been observed. Thus, the number of stable nuclides is subject——to change if some of these 251 are determined——to be, very long-lived radioactive nuclides in the "future." In this article, the "stable" nuclides are divided into three tables, one for nuclides that are theoretically stable (meaning no decay mode is possible) and nuclides that can theoretically undergo spontaneous fission. But have not been evaluated to check for evidence of this happening, one for nuclides that can theoretically undergo forms of decay other than spontaneous fission but have not been evaluated. And finally a table of nuclides that can theoretically decay and "have been evaluated but without detecting any decay." In this latter table, where a decay has been predicted theoretically but never observed experimentally (either directly/through finding an excess of the daughter), the theoretical decay mode is given in parentheses and have "> number" in the half-life column to show the lower limit for the half-life based on experimental observation. Such nuclides are considered to be "stable" until a decay has been observed in some fashion. For example, tellurium-123 was reported to be radioactive. But the same experimental group later retracted this report, "and it presently remains observationally stable."

The next group is the primordial radioactive nuclides. These have been measured to be radioactive. Or decay products have been identified (tellurium-128, barium-130). There are (currently) 35 of these (see these nuclides), of which 25 have half-lives longer than 10 years. With most of these 25, decay is difficult to observe and for most purposes they can be regarded as effectively stable. Bismuth-209 is notable as it is the only naturally occurring isotope of an element which was long considered stable. A further 10 nuclides, platinum-190, samarium-147, lanthanum-138, rubidium-87, rhenium-187, lutetium-176, thorium-232, uranium-238, potassium-40, and uranium-235 have half-lives between 7.0×10 and 4.83×10 years, which means they have experienced at least 0.5% depletion since the formation of the Solar System about 4.6×10 years ago, but still exist on Earth in significant quantities. They are the primary source of radiogenic heating and radioactive decay products. Together, there are a total of 286 primordial nuclides.

The list then covers the ~700 radionuclides with half-lives longer than 1 hour, split into two tables, half-lives greater than one day and less than one day.

Over 60 nuclides that have half-lives too short to be primordial can be detected in nature as a result of later production by natural processes, mostly in trace amounts. These include ~44 radionuclides occurring in the decay chains of primordial uranium and thorium (radiogenic nuclides), such as radon-222. Others are the products of interactions with energetic cosmic-rays (e.g. cosmic ray spallation) (cosmogenic nuclides), such as carbon-14. This gives a total of about 350 naturally occurring nuclides. Other nuclides may be occasionally produced naturally by rare cosmogenic interactions or as a result of other natural nuclear reactions (nucleogenic nuclides), but are difficult to detect.

Further shorter-lived nuclides have been detected in the spectra of stars, such as isotopes of technetium, promethium, and some actinides. The remaining nuclides are known solely from artificial nuclear transmutation. Some, such as caesium-137, are found in the environment but as a result of contamination from releases of man-made nuclear fission product (from nuclear weapons, nuclear reactors, and other processes). Other are produced artificially for industrial or medical purposes.

List legend※

Each group of radionuclides, starting with the longest-lived primordial radionuclides, is sorted by decreasing half-life, but the tables are sortable by other columns.

no (number) column

A running positive integer for reference. This number, i.e. position in this table, might be changed in the future, especially for nuclides with short half-lives.

nuclide column

Nuclide identifiers are given by their atomic mass number A and the symbol for the corresponding chemical element (corresponding to the unique proton number). In the cases that this is not the ground state, this is indicated by a m for metastable appended to the mass number. Sorting here sorts by mass number.

Z, N column

The number of protons (Z column) and number of neutrons (N column).

energy column

The column labeled "energy" denotes the energy equivalent of the mass of a neutron minus the mass per nucleon of this nuclide (so all nuclides get a positive value) in MeV, formally: m_n − m_nuclide / A, where A = Z + N is the mass number. Note that this means that a higher "energy" value actually means that the nuclide has a lower energy. The mass of the nuclide (in daltons) is A (m_n − E / k) where E is the energy, m_n is 1.008664916 Da and k = 931.49410242 the conversion factor between MeV and daltons.

half-life column

The main column shows times in seconds (31,556,926 seconds = 1 tropical year); a second column showing half-life in more usual units (year, day) is also provided.

Entries starting with a ">" indicates that no decay has ever been observed, with null experiments establishing lower limits for the half-life. Such elements are considered stable unless a decay can be observed (establishing an actual estimate for the half-life). Note half-lives may be imprecise estimates and can be subject to significant revision.

decay mode column

α	α decay
β	β decay
ββ	double β decay
ε	electron capture
β	β decay
ββ	double β decay
SF	spontaneous fission
IT	isomeric transition

Decay modes in parentheses are still not observed through experiment but are, by their energy, predicted to occur. Numbers in brackets indicate probability of that decay mode occurring in %, tr indicate <0.1%. Spontaneous fission is not shown as a theoretical decay mode for stable nuclides where other modes are possible (see these nuclides).

decay energy column

Multiple values for (maximal) decay energy are mapped to decay modes in their order. The decay energy listed is for the specific nuclide only, not for the whole decay chain. It includes the energy lost to neutrinos.

notes column

CG

Cosmogenic nuclide;

DP

Naturally occurring decay product (of thorium-232, uranium-238, and uranium-235);

ESS

Present in the early Solar System (first few million years), but extinct now as a primordial nuclide.

FP

Nuclear fission product (only those from uranium-235 or plutonium-239) (only those with a half-life over one day are shown);

IM

Industry or medically used radionuclide.

Full list※

Theoretically stable nuclides※

These are the theoretically stable nuclides, ordered by "energy".

No.	Nuclide	A	Z	N	Energy (MeV)
1	Fe	56	26	30	9.153567
2	Ni	62	28	34	9.147877
3	Ni	60	28	32	9.145862
4	Fe	58	26	32	9.142938
5	Cr	52	24	28	9.137037
6	Fe	57	26	31	9.127119
7	Co	59	27	32	9.126046
8	Cr	54	24	30	9.125633
9	Ni	61	28	33	9.124129
10	Mn	55	25	30	9.120611
11	Ni	64	28	36	9.119754
12	Zn	66	30	36	9.115258
13	Cr	53	24	29	9.114435
14	Cu	63	29	34	9.112272
15	Cu	65	29	36	9.106154
16	Zn	68	30	38	9.100845
17	Ti	50	22	28	9.099861
18	V	51	23	28	9.094884
19	Zn	67	30	37	9.084468
20	Ti	48	22	26	9.081488
21	Ge	72	32	40	9.079465
22	Ge	70	32	38	9.079372
23	Ga	69	31	38	9.076078
24	Sr	88	38	50	9.070438
25	Ge	74	32	42	9.063522
26	Ti	49	22	27	9.062323
27	Se	76	34	42	9.061485
28	Ga	71	31	40	9.059218
29	Se	78	34	44	9.058842
30	Zr	90	40	50	9.057631
31	Y	89	39	50	9.056743
32	Sr	86	38	48	9.054160
33	Kr	82	36	46	9.054126
34	Kr	84	36	48	9.052649
35	Ge	73	32	41	9.048006
36	Sr	87	38	49	9.046964
37	As	75	33	42	9.045093
38	Kr	80	36	44	9.044984
39	Se	77	34	43	9.040153
40	Rb	85	37	48	9.037998
41	Zr	91	40	51	9.037156
42	Kr	83	36	47	9.034966
43	Br	79	35	44	9.034220
44	Br	81	35	46	9.033979
45	Zr	92	40	52	9.032783
46	Ti	46	22	24	9.030532
47	Ti	47	22	25	9.027336
48	Ca	44	20	24	9.013793
49	Mo	94	42	52	9.011856
50	Nb	93	41	52	9.009051
51	Mo	96	42	54	8.996229
52	Mo	95	42	53	8.994564
53	Ca	42	20	22	8.989116
54	Ar	38	18	20	8.984870
55	Sc	45	21	24	8.983945
56	Mo	97	42	55	8.973806
57	Ru	98	44	54	8.971572
58	Ca	43	20	23	8.964551
59	Ru	100	44	56	8.963517
60	Ru	99	44	55	8.956348
61	S	34	16	18	8.951675
62	Ar	40	18	22	8.947325
63	Ru	102	44	58	8.944837
64	Ru	101	44	57	8.942117
65	K	41	19	22	8.938623
66	K	39	19	20	8.938174
67	Pd	104	46	58	8.930847
68	Cl	37	17	20	8.929760
69	Rh	103	45	58	8.925910
70	S	36	16	20	8.923108
71	Pd	106	46	60	8.919460
72	Pd	105	46	59	8.913356
73	Cl	35	17	18	8.900285
74	Pd	108	46	62	8.900253
75	Ag	107	47	60	8.897514
76	Cd	110	48	62	8.892718
77	Si	30	14	16	8.885761
78	Ag	109	47	62	8.885300
79	S	32	16	16	8.884318
80	S	33	16	17	8.876964
81	P	31	15	16	8.859744
82	Si	28	14	14	8.838935
83	Si	29	14	15	8.826327
84	Cd	112	48	64	8.880077
85	Cd	111	48	63	8.875445
86	Sn	114	50	64	8.865722
87	In	113	49	64	8.862212
88	Sn	116	50	66	8.860362
89	Sn	115	50	65	8.854249
90	Sn	118	50	68	8.848073
91	Sn	117	50	67	8.843977
92	Sn	120	50	70	8.830537
93	Sn	119	50	69	8.828201
94	Sb	121	51	70	8.811783
95	Te	122	52	70	8.811606
96	Te	124	52	72	8.801364
97	Sb	123	51	72	8.796727
98	Te	126	52	74	8.786126
99	Te	125	52	73	8.783505
100	Xe	128	54	74	8.773359
101	I	127	53	74	8.771981
102	Xe	130	54	76	8.762725
103	Xe	129	54	75	8.758904
104	Xe	132	54	78	8.747695
105	Xe	131	54	77	8.746253
106	Ba	134	56	78	8.735133
107	Cs	133	55	78	8.733515
108	Ba	136	56	80	8.724908
109	Ba	135	56	79	8.722072
110	Ba	137	56	81	8.711628
111	Ba	138	56	82	8.710904
112	Al	27	13	14	8.708242
113	Ce	140	58	82	8.700494
114	La	139	57	82	8.698892
115	Mg	26	12	14	8.694981
116	Pr	141	59	82	8.681405
117	Nd	142	60	82	8.676646
118	Mg	24	12	12	8.651911
119	Mg	25	12	13	8.599047
120	Gd	156	64	92	8.536342
121	Gd	157	64	93	8.522478
122	Gd	158	64	94	8.518775
123	Tb	159	65	94	8.508680
124	Na	23	11	12	8.485675
125	Dy	163	66	97	8.478607
126	Dy	164	66	98	8.473604
127	Ne	22	10	12	8.436087
128	Ne	20	10	10	8.423422
129	O	16	8	8	8.367390
130	Ne	21	10	11	8.344280
131	F	19	9	10	8.149612
132	O	17	8	9	8.118904
133	O	18	8	10	8.114744
134	C	12	6	6	8.071327
135	N	15	7	8	8.064594
136	N	14	7	7	7.866827
137	C	13	6	7	7.830943
138	He	4	2	2	7.465077
139	B	11	5	6	7.283337
140	B	10	5	5	6.866257
141	Be	9	4	5	6.810483
142	Li	7	3	4	5.941599
143	Li	6	3	3	5.723527
144	He	3	2	1	3.094327
145	H	2	1	1	1.503327
146	H	1	1	0	0.782327

Nuclides that are observationally stable, having theoretical decay modes other than spontaneous fission※

Ordered by "energy".

No.	Nuclide	A	Z	N	Energy	Decay mode	Decay energy (MeV)
147	Se	80	34	46	9.043326	(ββ)	0.134
148	Kr	86	36	50	9.039532	(ββ)	1.256
149	Sr	84	38	46	9.031375	(ββ)	1.787
150	Pd	102	46	56	8.933337	(ββ)	1.172
151	Ar	36	18	18	8.911105	(ββ)	0.433
152	Sn	122	50	72	8.808590	(ββ)	0.366
153	Sm	150	62	88	8.585043	(α)	1.449
154	Sm	152	62	90	8.563227	(α)	0.220
155	Gd	154	64	90	8.549985	(α)	0.081
156	Gd	155	64	91	8.536341	(α)	0.081
157	Er	164	68	96	8.473462	(ββ, α)	0.024, 1.304
158	Ho	165	67	98	8.464689	(α)	0.139
159	Er	166	68	98	8.462482	(α)	0.831
160	Er	167	68	99	8.450350	(α)	0.666
161	Er	168	68	100	8.446308	(α)	0.553
162	Tm	169	69	100	8.433931	(α)	1.200
163	Yb	170	70	100	8.428792	(α)	1.738
164	Yb	171	70	101	8.418182	(α)	1.559
165	Yb	172	70	102	8.415864	(α)	1.310
166	Yb	173	70	103	8.404023	(α)	0.946
167	Yb	174	70	104	8.398624	(α)	0.740
168	Lu	175	71	104	8.386589	(α)	1.620
169	Ta	181	73	108	8.338961	(α)	1.526
170	Re	185	75	110	8.308204	(α)	2.195
171	Ir	191	77	114	8.263508	(α)	2.084
172	Pt	194	78	116	8.250519	(α)	1.504
173	Ir	193	77	116	8.250259	(α)	1.017
174	Pt	195	78	117	8.239516	(α)	1.158
175	Pt	196	78	118	8.237896	(α)	0.794
176	Au	197	79	118	8.229404	(α)	0.954
177	Hg	198	80	118	8.227663	(α)	1.383
178	Hg	199	80	119	8.219805	(α)	0.824
179	Hg	200	80	120	8.218848	(α)	0.718
180	Hg	201	80	121	8.208956	(α)	0.334
181	Hg	202	80	122	8.206703	(α)	0.136
182	Tl	203	81	122	8.198230	(α)	0.911
183	Hg	204	80	124	8.192358	(ββ)	0.416
184	Tl	205	81	124	8.187526	(α)	0.157

Observationally stable nuclides for which decay has been searched for but not found (only lower bounds known)※

Ordered by lower bound on half-life.

No.	Nuclide	A	Z	N	Energy	Half-life (seconds)	Half-life (years)	Decay mode	Decay energy (MeV)
185	Xe	134	54	80	8.728973	> 8.8×10	> 2.8×10	(ββ)	0.825
186	Ca	40	20	20	8.942485	> 3.1×10	> 9.9×10	(ββ)	0.194
187	W	184	74	110	8.319737	> 2.8×10	> 8.9×10	(α)	1.656
188	W	182	74	108	8.336424	> 2.4×10	> 7.7×10	(α)	1.772
189	Pb	208	82	126	8.175888	> 8.2×10	> 2.6×10	(α)	0.519
190	Pb	206	82	124	8.186791	> 7.9×10	> 2.5×10	(α)	1.137
191	Xe	126	54	72	8.779010	> 6.0×10	> 1.9×10	(ββ)	0.897
192	Pb	207	82	125	8.179791	> 6.0×10	> 1.9×10	(α)	0.391
193	Te	120	52	68	8.816369	> 5.0×10	> 1.6×10	(ββ)	1.700
194	Cd	106	48	58	8.893327	> 3.5×10	> 1.1×10	(ββ)	2.770
195	Ni	58	28	30	9.109736	> 2.2×10	> 7.0×10	(ββ)	1.926
196	W	183	74	109	8.324699	> 2.1×10	> 6.7×10	(α)	1.680
197	Ru	104	44	60	8.918337	> 2.0×10	> 6.5×10	(ββ)	1.300
198	Fe	54	26	28	9.113040	> 1.4×10	> 4.4×10	(ββ)	0.680
199	Ba	132	56	76	8.741288	> 9.5×10	> 3.0×10	(ββ)	0.846
200	Pd	110	46	64	8.874500	> 9.1×10	> 2.9×10	(ββ)	2.000
201	Mo	92	42	50	9.014860	> 6.0×10	> 1.9×10	(ββ)	1.649
202	Pb	204	82	122	8.194414	> 4.4×10	> 1.4×10	(α)	1.972
203	Sn	112	50	62	8.862944	> 3.1×10	> 9.7×10	(ββ)	1.922
204	Ru	96	44	52	8.967911	> 2.5×10	> 8.0×10	(ββ)	2.719
205	Os	192	76	116	8.258202	> 1.7×10	> 5.3×10	(ββ, α)	0.413, 0.362
206	Pt	198	78	120	8.222378	> 1.0×10	> 3.2×10	(ββ, α)	1.047, 0.087
207	Gd	160	64	96	8.496009	> 9.8×10	> 3.1×10	(ββ)	1.729
208	Sm	144	62	82	8.640577	> 4.4×10	> 1.4×10	(ββ)	1.781
209	Os	190	76	114	8.275045	> 3.8×10	> 1.2×10	(α)	1.378
210	Zn	64	30	34	9.102634	> 3.5×10	> 1.1×10	(ββ)	1.096
211	Se	74	34	40	9.047175	> 2.2×10	> 7.0×10	(ββ)	1.209
212	W	186	74	112	8.299873	> 1.3×10	> 4.1×10	(α)	1.123
213	Zn	70	30	40	9.065109	> 1.2×10	> 3.8×10	(ββ)	0.998
214	Os	188	76	112	8.290138	> 1.0×10	> 3.3×10	(α)	2.143
215	Nd	143	60	83	8.658792	> 9.8×10	> 3.1×10	(α)	0.521
216	Nd	148	60	88	8.594388	> 9.5×10	> 3.0×10	(ββ, α)	1.929, 0.599
217	Ce	142	58	84	8.666666	> 9.1×10	> 2.9×10	(ββ, α)	1.417, 1.298
218	Hf	179	72	107	8.353293	> 8.5×10	> 2.7×10	(α)	1.806
219	Hg	196	80	116	8.233710	> 7.9×10	> 2.5×10	(ββ, α)	0.820, 2.027
220	Sm	154	62	92	8.541857	> 7.3×10	> 2.3×10	(ββ)	1.251
221	Nd	146	60	86	8.625649	> 5.0×10	> 1.6×10	(ββ, α)	0.070, 1.182
222	Cr	50	24	26	9.076517	> 4.1×10	> 1.3×10	(ββ)	1.167
223	Hf	178	72	106	8.365958	> 4.1×10	> 1.3×10	(α)	2.083
224	Hf	177	72	105	8.370139	> 3.5×10	> 1.1×10	(α)	2.245
225	Dy	156	66	90	8.523443	> 3.2×10	> 1.0×10	(ββ, α)	2.011, 1.758
226	Eu	153	63	90	8.550893	> 1.8×10	> 5.5×10	(α)	0.274
227	Hf	180	72	108	8.347930	> 1.5×10	> 4.6×10	(α)	1.283
228	Cd	108	48	60	8.897735	> 1.3×10	> 4.1×10	(ββ)	0.272
229	Er	170	68	102	8.424945	> 1.3×10	> 4.1×10	(ββ, α)	0.654, 0.050
230	Ce	138	58	80	8.705878	> 1.3×10	> 4.0×10	(ββ)	0.694
231	Ta	180	73	107	8.342767	> 9.1×10	> 2.9×10	(β, ε, IT, α)	0.783, 0.929, 2.103
232	Hf	176	72	104	8.381427	> 8.5×10	> 2.7×10	(α)	2.255
233	Ca	46	20	26	9.009047	> 5.7×10	> 1.8×10	(ββ)	0.988
234	Yb	176	70	106	8.375271	> 5.0×10	> 1.6×10	(ββ, α)	1.083, 0.570
235	Zr	94	40	54	8.999698	> 3.5×10	> 1.1×10	(ββ)	1.144
236	Sn	124	50	74	8.782914	> 3.2×10	> 1.0×10	(ββ)	2.287
237	Dy	162	66	96	8.492234	> 3.2×10	> 1.0×10	(α)	0.085
238	Ce	136	58	78	8.707122	> 3.0×10	> 9.6×10	(ββ)	2.419
239	Cd	114	48	66	8.860985	> 2.9×10	> 9.2×10	(ββ)	0.540
240	Te	123	52	71	8.796302	> 2.9×10	> 9.2×10	(ε)	0.052
241	Nd	145	60	85	8.632963	> 1.9×10	> 6.0×10	(α)	1.578
242	Pt	192	78	114	8.260353	> 1.9×10	> 6.0×10	(α)	2.418
243	Dy	161	66	95	8.494067	> 1.1×10	> 3.5×10	(α)	0.344
244	Dy	160	66	94	8.506816	> 2.7×10	> 8.5×10	(α)	0.439
245	Os	189	76	113	8.277599	> 1.1×10	> 3.5×10	(α)	1.976
246	Os	187	76	111	8.291746	> 1.0×10	> 3.2×10	(α)	2.720
247	Sm	149	62	87	8.589058	> 6.3×10	> 2.0×10	(α)	1.870
248	Dy	158	66	92	8.516973	> 3.2×10	> 1.0×10	(ββ, α)	0.283, 0.875
249	Er	162	68	94	8.480852	> 4.4×10	> 1.4×10	(ββ, α)	1.844, 1.646
250	Yb	168	70	98	8.437845	> 4.1×10	> 1.3×10	(ββ, α)	1.422, 1.951
251	Mo	98	42	56	8.970426	> 3.2×10	> 1.0×10	(ββ)	0.112

Primordial radioactive nuclides (half-life > 5 × 10 years)※

Ordered by half-life.

No.	Nuclide	A	Z	N	Energy	Half-life		Decay mode	Decay energy (MeV)
						(seconds)	(years)
252	Te	128	52	76	8.743261	6.94×10	2.2×10	ββ	0.868
253	Xe	124	54	70	8.778264	5.68×10	1.8×10	εε	2.864
254	Kr	78	36	42	9.022349	2.90×10	9.2×10	εε	2.846
255	Xe	136	54	82	8.706805	7.5×10	2.38×10	ββ	2.462
256	Ge	76	32	44	9.034656	5.642×10	1.8×10	ββ	2.039
257	Ba	130	56	74	8.742574	3.79×10	1.2×10	εε	2.620
258	Se	82	34	48	9.017596	3.408×10	1.1×10	ββ	2.995
259	Ca	48	20	28	8.992452	1.766×10	5.6×10	ββ	4.274
260	Cd	116	48	68	8.836146	9.783×10	3.1×10	ββ	2.809
261	Bi	209	83	126	8.158689	6.343×10	2.01×10	α	3.137
262	Zr	96	40	56	8.961359	6.3×10	2.0×10	ββ	3.348
263	Nd	150	60	90	8.562594	2.935×10	9.3×10	ββ	3.367
264	Te	130	52	78	8.766578	2.777×10	8.8×10	ββ	2.530
265	Mo	100	42	58	8.933167	2.231×10	7.07×10	ββ	3.035
266	Eu	151	63	88	8.565759	1.458×10	4.62×10	α	1.964
267	W	180	74	106	8.347127	5.680×10	1.8×10	α	2.509
268	V	50	23	27	9.055759	4.418×10	1.4×10	β, β	2.205, 1.038
269	Hf	174	72	102	8.392287	2.2×10	7.0×10	α	2.497
270	Cd	113	48	65	8.859372	2.430×10	7.7×10	β	0.321
271	Sm	148	62	86	8.607423	1.988×10	6.3×10	α	1.986
272	Nd	144	60	84	8.652947	7.227×10	2.29×10	α	1.905
273	Os	186	76	110	8.302508	6.312×10	2.0×10	α	2.823
274	In	115	49	66	8.849910	1.392×10	4.4×10	β	0.499
275	Gd	152	64	88	8.562868	3.408×10	1.1×10	α	2.203
276	Os	184	76	108	8.311850	3.53×10	1.12×10	α	2.963
277	Pt	190	78	112	8.267764	1.524×10	4.83×10	α	3.252
278	Sm	147	62	85	8.610593	3.364×10	1.066×10	α	2.310
279	La	138	57	81	8.698320	3.219×10	1.02×10	β, β	1.737, 1.044
280	Rb	87	37	50	9.043718	1.568×10	4.97×10	β	0.283
281	Re	187	75	112	8.291732	1.300×10	4.12×10	β	0.0026
282	Lu	176	71	105	8.374665	1.187×10	3.764×10	β, β	1.193
283	Th	232	90	142	7.918533	4.434×10	1.406×10	α, SF	4.083
284	U	238	92	146	7.872551	1.410×10	4.471×10	α, SF, ββ	4.270
285	K	40	19	21	8.909707	3.938×10	1.25×10	β, β	1.311, 1.505, 1.505
286	U	235	92	143	7.897198	2.222×10	7.04×10	α, SF	4.679

Radionuclides with half-lives of 10,000 years to 5 × 10 years※

Ordered by half-life. Some of these are known to have been present in the early Solar System (marked "ESS", meaning the first few million years of the Solar System's history), because of an excess of their decay products.

No.	Nuclide	Z	N	Energy	Half-life		Decay mode	Notes
					(seconds)	(years)
287	Sm	62	84	8.626136	3.250×10	1.03×10	α	ESS
288	Pu	94	150	7.826221	2.525×10	8.0×10	α, SF	interstellar, ESS
289	Nb	41	51	9.010980	1.095×10	3.47×10	β, β	CG, ESS
290	U	92	144	7.891470	7.391×10	2.34×10	α, SF	DP
291	Pb	82	123	8.187279	5.459×10	1.73×10	β	ESS
292	I	53	76	8.757397	4.955×10	1.57×10	β	CG, FP, ESS
293	Cm	96	151	7.806008	4.923×10	1.56×10	α	ESS
294	Hf	72	110	8.324399	2.809×10	8.90×10	β	ESS
295	Pd	46	61	8.897197	2.051×10	6.50×10	β	FP, ESS
296	Tc	43	54	8.970503	1.329×10	4.21×10	β
297	Tc	43	55	8.953246	1.325×10	4.20×10	β
298	Mn	25	28	9.103175	1.180×10	3.74×10	β	CG, ESS
299	Fe	26	34	9.094861	8.268×10	2.62×10	β	CG, interstellar, ESS
300	Bi	83	127	8.140473	9.594×10	2.58×10	α
301	Np	93	144	7.881989	6.766×10	2.14×10	α, SF	DP
302	Gd	64	86	8.576454	5.649×10	1.79×10	α
303	Zr	40	53	9.008069	4.828×10	1.53×10	β	FP
304	Be	4	6	6.810657	4.765×10	1.51×10	β	CG, ESS
305	Dy	66	88	8.528457	4.415×10	1.40×10	α
306	Cs	55	80	8.720082	4.194×10	1.33×10	β	FP
307	Al	13	13	8.540954	2.263×10	717000	β	CG, ESS
308	Pu	94	148	7.845218	1.183×10	375000	α, SF
309	Bi	83	125	8.162049	1.161×10	368000	β
310	Cm	96	152	7.799586	1.098×10	348000	α, SF
311	Cl	17	19	8.891380	9.499×10	301000	β, β	CG, IM
312	Se	34	45	9.032310	9.309×10	295000	β	FP
313	U	92	142	7.908308	7.747×10	245500	α, SF	DP
314	Sn	50	76	8.754026	7.258×10	223000	β	FP
315	Kr	36	45	9.030513	7.227×10	229000	β	CG
316	Tc	43	56	8.953379	6.662×10	211100	β	FP, DP
317	Re	75	111	8.295958	6.312×10	200000	IT
318	U	92	141	7.912873	5.024×10	159200	α, SF	DP
319	Np	93	143	7.887514	4.860×10	154000	β, β, α
320	Ca	20	21	8.928347	3.219×10	102000	β	CG, ESS
321	Ni	28	31	9.107863	2.398×10	76000	β
322	Th	90	140	7.937136	2.379×10	75400	α, SF	DP
323	La	57	80	8.707101	1.893×10	60000	β
324	Pb	82	120	8.199714	1.657×10	52500	β
325	Pa	91	140	7.926627	1.034×10	32770	α, SF	DP
326	Pu	94	145	7.868022	7.609×10	24110	α, SF	IM, DP
327	Nb	41	53	8.990099	6.406×10	20300	β	CG

Radionuclides with half-lives of 10 years to 10,000 years※

Ordered by half-life.

no	nuclide	Z	N	energy	half-life (seconds)	half-life (years)	decay mode	notes
328	Cm	96	154	7.779371	2.619×10	8300	SF, α, β
329	Cm	96	149	7.822329	2.60×10	8250	α, SF
330	Am	95	148	7.836035	2.326×10	7371	α, SF
331	Th	90	139	7.942127	2.316×10	7339	α	DP
332	Pu	94	146	7.862465	2.070×10	6560	α, SF	DP
333	C	6	8	7.855620	1.799×10	5700	β	CG, IM
334	Mo	42	51	9.004693	1.53×10	4839	β
335	Cm	96	150	7.816781	1.502×10	4760	α, SF
336	Ho	67	96	8.478591	1.442×10	4570	β
337	Ra	88	138	7.966597	5.049×10	1600	α	DP
338	Bk	97	150	7.806182	4.355×10	1380	α
339	Ho	67	99	8.451273	3.787×10	1200	β
340	Cf	98	153	7.775969	2.834×10	898	α, SF
341	Nb	41	50	9.023327	2.146×10	680	β
342	Hg	80	114	8.237271	1.401×10	444	β
343	Ag	47	61	8.881439	1.382×10	437.9	β, IT
344	Am	95	146	7.851676	1.364×10	432.2	α, SF	IM
345	Cf	98	151	7.791305	1.108×10	351.1	α, SF
346	Bk	97	151	7.796811	> 9.47×10	>300	α
347	Ar	18	21	8.923686	8.489×10	269	β	CG
348	Ir	77	115	8.251875	7.605×10	241	IT
349	Tb	65	93	8.511055	5.680×10	180	β, β
350	Am	95	147	7.841913	4.450×10	141	IT, α, SF
351	Si	14	18	8.823856	4.166×10	132	β	CG
352	Po	84	125	8.149633	3.951×10	125.2	α, β
353	Ni	28	35	9.111210	3.159×10	101	β	IM
354	Sm	62	89	8.565251	2.840×10	90.0	β	FP
355	Pu	94	144	7.877358	2.768×10	87.7	α, SF	IM, DP
356	Gd	64	84	8.586706	2.74×10	86.9	α
357	Tb	65	92	8.522096	2.241×10	71.0	β
358	U	92	140	7.922143	2.174×10	68.9	α, SF
359	Ti	22	22	8.924702	1.893×10	59.1	β
360	Pt	78	115	8.249965	1.578×10	50.0	β
361	Sn	50	71	8.808499	1.385×10	43.89	IT, β
362	Eu	63	87	8.569974	1.164×10	36.89	β
363	Ar	18	24	8.890923	1.038×10	32.9	β
364	Bi	83	124	8.168209	1.038×10	31.6	β
365	Hf	72	106		9.776×10	31	IT
366	Cs	55	82	8.703047	9.477×10	30.1	β	FP, IM
367	Cm	96	147	7.836004	9.183×10	29.1	α, β, SF
368	Sr	38	52	9.026239	9.120×10	28.9	β	FP, IM
369	Pb	82	128	8.141462	7.006×10	22.2	β, α	DP, IM
370	Ac	89	138	7.957447	6.871×10	21.77	β, α	DP
371	Cm	96	148	7.831763	5.712×10	18.1	α, SF
372	Pm	61	84	8.631838	5.586×10	17.7	β, α
373	Nb	41	52		5.084×10	16.1	IT
374	Pu	94	147	7.851590	4.510×10	14.3	β, α, SF
375	Cd	48	65		4.380×10	13.9	β, IT	FP
376	Eu	63	89	8.550897	4.262×10	13.51	β, β
377	Cf	98	152	7.786640	4.128×10	13.08	α, SF
378	H	1	2	3.087994	3.888×10	12.32	β	CG, IM
379	Kr	36	49	9.029919	3.384×10	10.72	β	FP, IM
380	Ba	56	77	8.729624	3.319×10	10.52	β

Radionuclides with half-lives of 1 day to 10 years※

Ordered by half-life.

no	nuclide	Z	N	energy	half-life (seconds)	half-life	decay mode	notes
381	Eu	63	91	8.537200	2.711×10	8.60 y	β, β
382	Os	76	118	8.238508	1.893×10	6.0 y	β
383	Ra	88	140	7.944390	1.815×10	5.75 y	β	DP
384	Pm	61	85	8.615574	1.745×10	5.53 y	β, β
385	Co	27	33	9.098811	1.663×10	5.27 y	β	IM
386	Eu	63	92	8.534711	1.500×10	4.75 y	β	FP
387	Tl	81	123	8.190671	1.193×10	3.78 y	β, β	IM
388	Lu	71	103	8.390726	1.045×10	3.31 y	β
389	Rh	45	56	8.936753	1.041×10	3.3 y	β
390	Rh	45	57	8.920680	9.152×10	2.9 y	β, IT
391	Po	84	124	8.155315	9.145×10	2.898 y	α, β
392	Pu	94	142	7.889536	9.019×10	2.858 y	α, SF
393	Sb	51	74	8.777367	8.705×10	2.759 y	β	FP
394	Fe	26	29	9.116407	8.637×10	2.737 y	β
395	Cf	98	154	7.769605	8.347×10	2.645 y	α, SF	IM
396	Pm	61	86	8.609068	8.279×10	2.624 y	β	FP, DP
397	Na	11	11	8.306891	8.213×10	2.603 y	β	CG
398	Cs	55	79	8.719768	6.517×10	2.065 y	β, β	FP
399	Tm	69	102	8.417620	6.059×10	1.92 y	β
400	Th	90	138	7.953906	6.033×10	1.912 y	α	DP
401	Hf	72	100	8.399252	5.901×10	1.87 y	β
402	Ta	73	106	8.352703	5.743×10	1.82 y	β
403	Lu	71	102	8.400147	4.323×10	1.37 y	β
404	Es	99	153	7.764621	4.075×10	1.291 y	α, β, β
405	Cd	48	61	8.883327	3.986×10	1.263 y	β
406	Np	93	142	7.896669	3.422×10	1.084 y	β, α
407	Ru	44	62	8.885686	3.228×10	1.023 y	β	FP
408	Pm	61	83	8.636751	3.136×10	363 d	β
409	Sm	62	83	8.627590	2.938×10	340 d	β
410	Cf	98	150	7.800198	2.881×10	333.4 d	α, SF
411	Bk	97	152	7.790805	2.851×10	330 d	β, α, SF
412	V	23	26	9.050040	2.843×10	329.1 d	β
413	Mn	25	29	9.100131	2.697×10	312.2 d	β, β	IM
414	Sn	50	69		2.534×10	293.1 d	IT
415	Ce	58	86	8.629918	2.462×10	285 d	β	FP
416	Es	99	155	7.748524	2.382×10	275.7 d	α, β, SF, β
417	Co	27	30	9.112454	2.348×10	271.8 d	β	IM
418	Ge	32	36	9.056327	2.341×10	271 d	β	IM
419	Pm	61	82	8.651509	2.290×10	265 d	β
420	Ag	47	63	8.865355	2.158×10	249.8 d	β, IT
421	Zn	30	35	9.085352	2.105×10	243.6 d	β	IM
422	Gd	64	89	8.547731	2.077×10	240.4 d	β	IM
423	Rh	45	57		1.788×10	207 d	β, β
424	Au	79	116	8.238353	1.608×10	186.1 d	β
425	Ir	77	117	8.238025	1.477×10	170.9 d	β
426	Re	75	109	8.310670	1.460×10	169 d	IT, β
427	Cm	96	146	7.844860	1.407×10	162.8 d	α, SF
428	Ca	20	25	8.978261	1.405×10	162.6 d	β
429	Lu	71	106	8.361829	1.386×10	160.4 d	β, IT
430	Te	52	69	8.800749	1.331×10	154.1 d	IT, β
431	Dy	66	93	8.506378	1.248×10	144.4 d	β
432	Lu	71	103		1.227×10	142 d	IT, EC
433	Po	84	126	8.147295	1.196×10	138.4 d	α	DP
434	Ce	58	81	8.696881	1.189×10	137.6 d	β
435	Sn	50	73	8.785311	1.116×10	129.2 d	β
436	Tm	69	101	8.423096	1.111×10	128.6 d	β, β
437	Gd	64	87	8.562685	1.071×10	124 d	β, α
438	W	74	107	8.337924	1.047×10	121.2 d	β
439	Se	34	41	9.033581	1.035×10	119.8 d	β	IM
440	Te	52	71		1.03×10	119.2 d	IT
441	Sn	50	63	8.853035	9.944×10	115.1 d	β
442	Ta	73	109	8.326456	9.887×10	114.4 d	β
443	Te	52	75	8.765759	9.418×10	109 d	IT
444	Y	39	49	9.029272	9.212×10	106.6 d	β
445	Fm	100	157	7.726619	8.683×10	100.5 d	α, SF
446	Os	76	109	8.302730	8.087×10	93.6 d	β
447	Tm	69	99	8.436316	8.044×10	93.1 d	β, β
448	Eu	63	86	8.584395	8.044×10	93.1 d	β
449	Tc	43	54		7.862×10	91 d	IT
450	S	16	19	8.895510	7.561×10	87.51 d	β	CG
451	Rb	37	46	9.024038	7.448×10	86.2 d	β
452	Sc	21	25	8.979091	7.239×10	83.78 d	β
453	Zr	40	48	9.021589	7.206×10	83.4 d	β
454	As	33	40	9.043341	6.938×10	80.3 d	β
455	Co	27	29	9.072031	6.673×10	77.23 d	β
456	W	74	111	8.305866	6.489×10	75.1 d	β
457	Ir	77	115		6.379×10	73.827 d	β,ε	IM
458	Tb	65	95	8.495346	6.247×10	72.3 d	β
459	Co	27	31	9.103153	6.122×10	70.86 d	β
460	Re	75	108	8.321661	6.048×10	70 d	β
461	Hf	72	103	8.382665	6.048×10	70 d	β
462	W	74	114	8.277003	6.029×10	69.78 d	β
463	Sr	38	47	9.025480	5.602×10	64.84 d	β
464	Zr	40	55	8.972989	5.532×10	64.03 d	β	FP
465	Tc	43	52	8.976359	5.270×10	61 d	β, IT
466	Nb	41	50		5.258×10	60.86 d	IT,ε
467	Cf	98	156	7.751087	5.227×10	60.5 d	SF, α
468	Sb	51	73	8.777943	5.194×10	60.12 d	β
469	I	53	72	8.782019	5.132×10	59.4 d	β	IM
470	Y	39	52	9.020174	5.055×10	58.51 d	β	FP
471	Te	52	73		4.959×10	57.4 d	IT
472	Eu	63	85	8.586882	4.709×10	54.5 d	β, α
473	Be	4	3	5.818470	4.598×10	53.22 d	β	CG
474	Md	101	157	7.715948	4.450×10	51.5 d	α, SF
475	Sr	38	51	9.039969	4.369×10	50.57 d	β	FP, IM
476	In	49	65	8.846608	4.278×10	49.51 d	IT, β
477	Gd	64	82	8.592512	4.171×10	48.28 d	β
478	Hg	80	123	8.195806	4.026×10	46.6 d	β
479	Pu	94	143	7.881060	3.905×10	45.2 d	β, α
480	Cd	48	67	8.835754	3.850×10	44.56 d	β
481	Fe	26	33	9.099516	3.844×10	44.49 d	β	IM
482	Hf	72	109	8.333272	3.662×10	42.38 d	β
483	Pm	61	87	8.589800	3.567×10	41.28 d	β, IT
484	Ag	47	58	8.900547	3.567×10	41.28 d	β
485	Es	99	156	7.741567	3.439×10	39.8 d	β, α, SF
486	Ru	44	59	8.918500	3.392×10	39.26 d	β	FP
487	Xe	54	73	8.766768	3.145×10	36.4 d	β
488	Re	75	109		3.059×10	35.4 d	β
489	Nb	41	54	8.984821	3.023×10	34.99 d	β	FP
490	Ar	18	19	8.907752	3.020×10	34.95 d	β	CG
491	Te	52	77	8.744953	2.903×10	33.6 d	IT, β
492	Rb	37	47	9.020732	2.860×10	33.1 d	β, β
493	Cm	96	145	7.848492	2.834×10	32.8 d	β, α
494	Ce	58	83	8.677286	2.809×10	32.51 d	β	FP
495	Yb	70	99	8.428546	2.767×10	32.03 d	β	IM
496	Md	101	159	7.699789	2.748×10	31.81 d	SF, α, β, β
497	Cr	24	27	9.080127	2.393×10	27.7 d	β	IM
498	Cm	96	144	7.855805	2.333×10	27 d	α, β, SF
499	Pa	91	142	7.910426	2.331×10	26.98 d	β	DP
500	Sr	38	44	8.998254	2.208×10	25.56 d	β	IM
501	P	15	18	8.869434	2.189×10	25.34 d	β
502	Hf	72	107		2.164×10	25.05 d	IT
503	Th	90	144	7.897763	2.082×10	24.1 d	β	DP
504	Eu	63	84	8.598879	2.082×10	24.1 d	β, α
505	W	74	104	8.354563	1.866×10	21.6 d	β
506	U	92	138	7.933871	1.797×10	20.8 d	α, SF
507	Es	99	154	7.759019	1.769×10	20.5 d	α, SF
508	Te	52	69		1.656×10	19.2 d	ε
509	Th	90	137	7.957644	1.614×10	18.7 d	α	DP
510	Rb	37	49	9.033502	1.611×10	18.6 d	β, β
511	Cf	98	155	7.757885	1.539×10	17.8 d	β, α
512	As	33	41	9.028895	1.535×10	17.8 d	β, β
513	Pa	91	139	7.931436	1.503×10	17.4 d	β, β, α
514	Pd	46	57	8.920638	1.468×10	17.0 d	β	IM
515	Rh	45	54	8.935711	1.391×10	16.1 d	β
516	V	23	25	8.997890	1.380×10	15.97 d	β
517	Os	76	115	8.261870	1.331×10	15.41 d	β
518	Bi	83	122	8.174069	1.323×10	15.31 d	β
519	Eu	63	93	8.520642	1.312×10	15.19 d	β
520	Ra	88	137	7.973576	1.287×10	14.9 d	β	DP
521	P	15	17	8.830865	1.232×10	14.268 d	β	CG, IM
522	Sn	50	67		1.21×10	14 d	IT
523	Pr	59	84	8.652258	1.172×10	13.56 d	β
524	Ir	77	112	8.274783	1.140×10	13.19 d	β
525	Cs	55	81	8.706171	1.127×10	13.04 d	β
526	I	53	73	8.769026	1.117×10	12.93 d	β, β
527	Ba	56	84	8.666120	1.102×10	12.75 d	β	FP
528	Sb	51	75	8.757042	1.067×10	12.35 d	β
529	Tl	81	121	8.199956	1.057×10	12.23 d	β
530	Xe	54	77		1.023×10	11.84 d	IT
531	Ir	77	113	8.264755	1.018×10	11.78 d	β
532	Ba	56	75	8.733037	9.936×10	11.5 d	β
533	Ra	88	135	7.994042	9.876×10	11.43 d	α	DP, IM
534	Ge	32	39	9.055943	9.876×10	11.43 d	β
535	Nd	60	87	8.602973	9.487×10	10.98 d	β
536	Pu	94	152	7.805494	9.366×10	10.84 d	β
537	Ir	77	116		9.098×10	10.53 d	IT
538	Pt	78	110	8.272514	8.813×10	10.2 d	β, α
539	Nb	41	51		8.770×10	10.15 d	β, α
540	Ac	89	136	7.975159	8.571×10	9.92 d	α	DP
541	Cs	55	76	8.743541	8.371×10	9.69 d	β	IM
542	Sn	50	75	8.758515	8.329×10	9.64 d	β
543	Er	68	101	8.431852	8.115×10	9.39 d	β	IM
544	Gd	64	85	8.575576	8.018×10	9.28 d	β, α
545	Tm	69	98	8.445866	7.992×10	9.25 d	β
546	Xe	54	75		7.672×10	8.88 d	IT
547	Po	84	122	8.159590	7.603×10	8.80 d	β, α
548	Se	34	38	9.014300	7.258×10	8.40 d	β
549	Ag	47	59	8.890639	7.154×10	8.28 d	β
550	Lu	71	100	8.409532	7.119×10	8.24 d	β
551	I	53	78	8.738842	6.930×10	8.02 d	β	FP, IM
552	Es	99	158	7.723468	6.653×10	7.7 d	β, SF
553	Ag	47	64	8.866111	6.437×10	7.45 d	β
554	Tb	65	96	8.490383	5.967×10	6.91 d	β
555	U	92	145	7.879800	5.832×10	6.75 d	β	DP
556	Lu	71	101	8.401217	5.789×10	6.70 d	β	IM
557	Lu	71	106		5.743×10	6.65 d	β
558	Cs	55	77	8.731599	5.599×10	6.48 d	β, β
559	Bi	83	123	8.168551	5.394×10	6.24 d	β
560	Au	79	117	8.230205	5.328×10	5.17 d	β, β
561	Ni	28	28	9.033899	5.249×10	6.08 d	β
562	Te	52	66	8.814726	5.184×10	6 d	β
563	Eu	63	82	8.609245	5.124×10	5.93 d	β
564	Sb	51	69	8.808194	4.977×10	5.76 d	β
565	Mn	25	27	9.046431	4.831×10	5.59 d	β
566	Pm	61	87		4.638×10	5.37 d	β
567	Tb	65	91	8.520667	4.622×10	5.35 d	β
568	Tb	65	90	8.531031	4.596×10	5.32 d	β
569	Xe	54	79	8.730302	4.530×10	5.24 d	β	IM
570	Ta	73	110	8.318847	4.406×10	5.10 d	β
571	Bi	83	127		4.330×10	5.01 d	β, α	DP
572	Bk	97	148	7.819020	4.268×10	4.94 d	β, α
573	Te	52	67	8.801773	4.061×10	4.7 d	β, IT
574	Eu	63	83	8.599560	3.983×10	4.61 d	β
575	Ca	20	27	8.972181	3.919×10	4.54 d	β
576	Np	93	141	7.900571	3.802×10	4.4 d	β
577	Rh	45	56		3.74×10	4.34 d	ε, IT
578	Pt	78	115		3.74×10	4.33 d	IT
579	Tc	43	53	8.965255	3.698×10	4.28 d	β
580	U	92	139	7.924977	3.629×10	4.2 d	β, α
581	Yb	70	105	8.383902	3.616×10	4.19 d	β
582	I	53	71	8.775884	3.608×10	4.18 d	β	IM
583	Pt	78	117		3.46×10	4.01 d	IT
584	Sb	51	76	8.754005	3.326×10	3.85 d	β
585	Rn	86	136	7.997573	3.304×10	3.82 d	α	DP
586	Re	75	111		3.21×10	3.72 d	β−,e	IM
587	Ra	88	136	7.987277	3.138×10	3.63 d	α	DP
588	Pd	46	54	8.923587	3.136×10	3.63 d	β
589	Nb	41	54		3.11×10	3.61 d	IT, β−
590	Dy	66	100	8.448376	2.938×10	3.4 d	β
591	Nd	60	80	8.673113	2.912×10	3.37 d	β
592	Sc	21	26	9.014564	2.894×10	3.35 d	β
593	Y	39	48	9.025565	2.873×10	3.33 d	β
594	Zr	40	49	9.024912	2.823×10	3.27 d	β
595	Ga	31	36	9.069532	2.819×10	3.26 d	β	IM
596	Te	52	80	8.716646	2.768×10	3.2 d	β	FP
597	Ce	58	76	8.704432	2.730×10	3.16 d	β
598	Au	79	120	8.217534	2.712×10	3.14 d	β
599	Tl	81	120	8.206561	2.625×10	3.04 d	β	IM
600	Fm	100	153	7.757691	2.592×10	3. d	β, α
601	Pt	78	113	8.258228	2.473×10	2.86 d	β
602	In	49	62	8.867688	2.423×10	2.8 d	β	IM
603	Ru	44	53	8.959080	2.411×10	2.79 d	β
604	Mo	42	57	8.939669	2.375×10	2.75 d	β	FP, IM
605	Sb	51	71	8.795346	2.353×10	2.72 d	β, β
606	As	33	38	9.027581	2.350×10	2.72 d	β
607	Au	79	119	8.220732	2.329×10	2.7 d	β	IM
608	Hg	80	117	8.226358	2.309×10	2.67 d	β
609	Y	39	51	9.032294	2.306×10	2.67 d	β	IM
610	Re	75	107	8.321053	2.304×10	2.67 d	β
611	Tm	69	103	8.404932	2.290×10	2.65 d	β
612	Cu	29	38	9.076086	2.226×10	2.58 d	β	IM
613	Sc	21	23	8.924627	2.110×10	2.44 d	IT, β
614	Ba	56	72	8.738523	2.100×10	2.43 d	β
615	Br	35	42	9.022431	2.053×10	2.38 d	β
616	Yb	70	96	8.442340	2.041×10	2.36 d	β
617	Ta	73	104	8.363553	2.036×10	2.36 d	β
618	Np	93	146	7.864999	2.036×10	2.36 d	β	DP
619	Tb	65	88	8.537471	2.022×10	2.34 d	β
620	Ni	28	38	9.071423	1.966×10	2.28 d	β
621	Pu	94	153	7.791975	1.961×10	2.27 d	β
622	Au	79	119		1.96×10	2.27 d	IT
623	Cd	48	67		1.92×10	2.23 d	β−
624	Pm	61	88	8.581871	1.911×10	2.21 d	β
625	Xe	54	79		1.89×10	2.20 d	IT
626	Pb	82	121	8.193431	1.869×10	2.16 d	β
627	Np	93	145	7.871931	1.829×10	2.12 d	β
628	Am	95	145	7.856694	1.829×10	2.12 d	β, α
629	Er	68	104	8.399752	1.775×10	2.05 d	β
630	Lu	71	99	8.408445	1.738×10	2.01 d	β
631	Zn	30	42	9.017591	1.674×10	1.94 d	β
632	Sm	62	91	8.545614	1.666×10	1.93 d	β	IM
633	Pt	78	124	8.183209	1.584×10	1.83 d	β
634	Sc	21	27	8.998327	1.572×10	1.82 d	β
635	Bk	97	149	7.811287	1.555×10	1.8 d	β, α
636	Hg	80	115	8.229399	1.498×10	1.73 d	IT, β
637	Ir	77	111	8.275200	1.494×10	1.73 d	β
638	La	57	83	8.673620	1.450×10	1.68 d	β
639	Es	99	155		1.41×10	1.64 d	β−, IT, α, EC, SF
640	Ge	32	37	9.043800	1.406×10	1.63 d	β
641	Ba	56	77		1.4×10	1.62 d	IT,e
642	As	33	44	9.031283	1.398×10	1.62 d	β
643	Sb	51	68	8.823235	1.375×10	1.59 d	β
644	Gd	64	83	8.584001	1.370×10	1.59 d	β
645	Au	79	115	8.237626	1.369×10	1.58 d	β
646	Pa	91	138	7.940769	1.296×10	1.5 d	β, α
647	Cf	98	148	7.810792	1.285×10	1.49 d	α, β, SF
648	Ni	28	29	9.055222	1.282×10	1.48 d	β
649	Rh	45	60	8.907956	1.273×10	1.47 d	β	FP
650	Br	35	47	9.016407	1.270×10	1.47 d	β
651	Kr	36	43	9.013644	1.261×10	1.46 d	β
652	Ce	58	79	8.696327	1.238×10	1.43 d	IT, β
653	Lu	71	98	8.414978	1.226×10	1.42 d	β
654	Ce	58	85	8.642041	1.189×10	1.38 d	β
655	Es	99	152	7.774467	1.188×10	1.38 d	β, α
656	Sr	38	45	8.996568	1.167×10	1.35 d	β
657	Cs	55	74	8.749622	1.154×10	1.34 d	β
658	Db	105	163	7.635133	1.152×10	1.33 d	SF, EC, α
659	Pa	91	141	7.916379	1.132×10	1.31 d	β, β
660	Os	76	117	8.244348	1.084×10	1.25 d	β
661	Tm	69	96	8.452758	1.082×10	1.25 d	β
662	Te	52	79	8.720392	1.080×10	1.25 d	β, IT
663	Ac	89	137	7.963761	1.057×10	1.22 d	β, β, α
664	Er	68	92	8.484190	1.029×10	1.19 d	β
665	Pm	61	90	8.557387	1.022×10	1.18 d	β
666	Ba	56	79		1.01×10	1.17 d	IT
667	Sn	50	71		9.73×10	1.13 d	β−
668	Ho	67	99		9.65×10	1.12 d	β−	IM
669	As	33	43	9.022505	9.454×10	1.09 d	β
670	Tl	81	119	8.206567	9.396×10	1.09 d	β
671	As	33	39	9.018966	9.360×10	1.08 d	β
672	Th	90	141	7.924932	9.187×10	1.06 d	β, α	DP
673	Fm	100	152	7.766498	9.140×10	1.06 d	α, SF
674	Tb	65	91		8.78×10	1.02 d	IT
675	Re	75	114	8.272269	8.748×10	1.01 d	β

Radionuclides with half-lives of 1 hour to 1 day※

Ordered by half-life.

no	nuclide	Z	N	energy	half-life (seconds)	half-life (hours)	decay mode	notes
676	Hg	80	117		8.568×10	23.8	IT
677	W	74	113	8.284722	8.539×10	23.7	β
678	Bk	97	151		8.532×10	23.7	β, EC (30)
679	Hf	72	101	8.391617	8.496×10	23.6	β
680	Nb	41	55	8.963036	8.406×10	23.4	β
681	Tb	65	89	8.526912	8.172×10	22.7	β, IT (1.8)
682	Np	93	143		8.1×10	22.5	EC, β (50)
683	K	19	24	8.922327	8.028×10	22.3	β
684	Os	76	106	8.316432	7.956×10	22.1	β
685	Pa	91	137	7.944468	7.920×10	22.0	β, α (2)
686	Cr	24	24	8.963390	7.762×10	21.6	β
687	Tb	65	89		7.74×10	21.5	β, β (<0.1)
688	Pb	82	118	8.202542	7.740×10	21.5	β
689	Pd	46	66	8.842185	7.571×10	21.0	β
690	Mg	12	16	8.607706	7.529×10	20.9	β	CG
691	Rh	45	55	8.927167	7.488×10	20.8	β
692	I	53	80	8.717094	7.488×10	20.8	β
693	Xe	54	68	8.770959	7.236×10	20.1	β
694	Fm	100	155	7.742704	7.225×10	20.1	α, SF (tr)
695	Tc	43	52		7.2×10	20.0	β
696	Re	75	106	8.328294	7.164×10	19.9	β
697	Pt	78	119	8.225756	7.161×10	19.9	β
698	La	57	78	8.713179	7.020×10	19.5	β
699	Ir	77	117		6.941×10	19.3	β
700	Pr	59	83	8.661417	6.883×10	19.1	β,EC (tr)
701	Au	79	121	8.202877	6.732×10	18.7	β, IT (18)
702	Gd	64	95	8.502576	6.652×10	18.5	β
703	Ce	58	77	8.698179	6.372×10	17.7	β
704	Au	79	114	8.244353	6.354×10	17.7	β
705	Tb	65	86	8.545692	6.339×10	17.6	β, α (tr)
706	Co	27	28	9.053647	6.311×10	17.5	β
707	Tb	65	87	8.536591	6.300×10	17.5	β, α (tr)
708	Re	75	113	8.278860	6.121×10	17.0	β	IM
709	Xe	54	71	8.768864	6.084×10	16.9	β
710	Zr	40	57	8.926451	6.028×10	16.7	β
711	Ir	77	109	8.281935	5.990×10	16.6	β
712	Zr	40	46	8.975979	5.940×10	16.5	β
713	Br	35	41	8.996183	5.832×10	16.2	β
714	Te	52	67		5.778×10	16.1	EC, e+ (2.1)
715	Am	95	147		5.767×10	16.0	β, EC (17)
716	Hf	72	98	8.402210	5.764×10	16.0	β
717	Eu	63	94	8.513792	5.465×10	15.2	β
718	Na	11	13	8.422082	5.382×10	15.0	β	CG, IM
719	Kr	36	40	8.979406	5.328×10	14.8	β
720	Y	39	47	8.993234	5.306×10	14.7	β
721	Rn	86	125	8.112825	5.256×10	14.6	β, α (27)
722	Nb	41	49	8.989727	5.256×10	14.6	β
723	Ir	77	108	8.289382	5.184×10	14.4	β
724	U	92	148	7.851682	5.076×10	14.1	β	DP
725	Ga	31	41	9.023958	5.074×10	14.1	β
726	Zn	30	39	9.056536	4.954×10	13.8	IT, β (tr)
727	Pd	46	63	8.875061	4.932×10	13.7	β
728	Y	39	48		4.813×10	13.4	IT, β (1.6)
729	I	53	70	8.786311	4.760×10	13.2	β	IM
730	Os	76	115		4.716×10	13.1	IT
731	Os	76	107	8.309907	4.680×10	13.0	β
732	Eu	63	87		4.608×10	12.8	β, β(11)
733	Cu	29	35	9.093581	4.572×10	12.7	β, β (38)	IM
734	Re	75	107		4.572×10	12.7	β
735	Pt	78	122	8.204342	4.500×10	12.5	β
736	I	53	77	8.740035	4.450×10	12.4	β
737	K	19	23	8.905175	4.436×10	12.3	β	IM
738	Hf	72	99	8.395480	4.356×10	12.1	β
739	Am	95	144	7.864666	4.284×10	11.9	β, α (0.01)
740	Hg	80	113	8.231483	4.248×10	11.8	β, IT (7.2)
741	Bi	83	120	8.177436	4.234×10	11.8	β
742	Ge	32	45	8.996185	4.068×10	11.3	β
743	Bi	83	121	8.172651	4.039×10	11.2	β
744	Pt	78	111	8.264359	3.913×10	10.9	β
745	Pb	82	130	8.106928	3.830×10	10.6	β	DP, IM
746	Hg	80	115		3.791×10	10.5	β
747	Ta	73	102	8.370813	3.780×10	10.5	β
748	Pu	94	151	7.813752	3.780×10	10.5	β
749	Ir	77	110	8.283713	3.780×10	10.5	β
750	Er	68	97	8.462406	3.730×10	10.4	β
751	Y	39	54	8.976951	3.665×10	10.2	β
752	Am	95	149	7.825914	3.636×10	10.1	β
753	Lr	103	163		3.600×10	10.0	SF
754	Tb	65	89		3.598×10	9.99	β, IT(22)
755	Os	76	107		3.564×10	9.90	β, IT(15)
756	Dy	66	89	8.517521	3.564×10	9.90	β
757	Sr	38	53	8.990503	3.467×10	9.63	β
758	Au	79	117		3.456×10	9.60	IT
759	Ga	31	35	9.036843	3.416×10	9.49	β
760	Sm	62	94	8.516007	3.384×10	9.40	β
761	Te	52	75		3.366×10	9.35	β
762	Pb	82	119	8.196989	3.359×10	9.33	β
763	Eu	63	89		3.352×10	9.31	β, β(28)
764	Zn	30	32	9.057957	3.307×10	9.19	β
765	Xe	54	81	8.711453	3.290×10	9.14	β
766	Co	27	31		3.276×10	9.10	IT
767	Sb	51	77	8.732343	3.244×10	9.01	β
768	Ce	58	79		3.24×10	9.00	β
769	Pu	94	140	7.898892	3.168×10	8.80	β, α (~6)
770	Ta	73	111	8.304154	3.132×10	8.70	β
771	Es	99	151	7.778407	3.096×10	8.60	β, α (<3)
772	Pd	46	55	8.917149	3.049×10	8.47	β
773	Fe	26	26	9.000789	2.979×10	8.28	β
774	Tm	69	104	8.396524	2.966×10	8.24	β
775	Ta	73	107		2.935×10	8.15	EC, β (14)
776	Dy	66	91	8.513544	2.930×10	8.14	β
777	At	85	125	8.128337	2.916×10	8.10	β, α (0.2)
778	Ta	73	103	8.363202	2.912×10	8.09	β
779	Tm	69	97	8.444183	2.772×10	7.70	β
780	Es	99	157	7.730742	2.736×10	7.60	β
781	Er	68	103	8.408901	2.706×10	7.52	β
782	Tl	81	118	8.212333	2.671×10	7.42	β
783	At	85	126	8.126527	2.597×10	7.21	β, α (42)
784	Se	34	39	9.005821	2.574×10	7.15	β
785	Mo	42	51		2.466×10	6.85	IT, β (0.1)
786	Pa	91	143	7.898930	2.412×10	6.70	β	DP
787	I	53	82	8.691994	2.365×10	6.57	β
788	Cd	48	59	8.884271	2.340×10	6.50	β
789	Rb	37	45	8.999608	2.330×10	6.47	β, IT (<0.3)
790	Dy	66	87	8.523288	2.304×10	6.40	β, α (tr)
791	Cs	55	72	8.750383	2.250×10	6.25	β
792	Ac	89	139	7.944591	2.214×10	6.15	β	DP
793	Tc	43	56		2.162×10	6.01	IT, β (tr)	IM
794	Pr	59	86	8.620514	2.154×10	5.98	β
795	Os	76	113		2.092×10	5.81	IT
796	Po	84	123	8.154158	2.088×10	5.80	β, α (0.02)
797	Mo	42	48	8.962072	2.002×10	5.56	β
798	Md	101	156	7.725040	1.987×10	5.52	EC, α (15), SF (tr)
799	Pd	46	65	8.844589	1.980×10	5.50	IT, β (27)
800	Nd	60	79	8.659529	1.980×10	5.50	β, IT (12)
801	Hf	72	108		1.969×10	5.47	IT, β (0.3)
802	At	85	124	8.132954	1.948×10	5.41	β, α (4.1)
803	Ag	47	66	8.841531	1.933×10	5.37	β
804	Tb	65	91		1.908×10	5.30	IT (?), β (?)
805	Tl	81	117	8.210166	1.908×10	5.30	β
806	Fm	100	151	7.768590	1.908×10	5.30	β, α (1.8)
807	Nd	60	78	8.665661	1.814×10	5.04	β
808	Ho	67	93	8.485877	1.807×10	5.02	IT, β (27)
809	Sb	51	67	8.814963	1.800×10	5.00	β
810	Pu	94	149	7.833648	1.784×10	4.96	β
811	Au	79	113	8.242036	1.778×10	4.94	β
812	In	49	61	8.857464	1.764×10	4.90	β
813	Ce	58	75	8.690771	1.764×10	4.90	β
814	Tc	43	51	8.966583	1.758×10	4.88	β
815	Y	39	46	8.986880	1.750×10	4.86	β, IT (tr)
816	Ga	31	42	9.026112	1.750×10	4.86	β
817	Hg	80	112	8.238051	1.746×10	4.85	β
818	La	57	75	8.705721	1.728×10	4.80	β
819	Rh	45	54		1.692×10	4.70	β, IT (<0.16)
820	Db	105	162	7.644361	1.656×10	4.60	SF
821	Lu	71	108	8.345428	1.652×10	4.59	β
822	Rb	37	44	9.002871	1.645×10	4.57	β	IM
823	Bk	97	146	7.829801	1.620×10	4.50	β, α (~0.15)
824	In	49	66		1.615×10	4.49	IT, β (5.0)
825	Kr	36	49		1.613×10	4.48	β, IT (21)
826	Ru	44	61	8.889689	1.598×10	4.44	β
827	Br	35	45	9.018872	1.591×10	4.42	IT
828	Pr	59	80	8.681565	1.588×10	4.41	β
829	Sb	51	78	8.727358	1.584×10	4.40	β
830	Bk	97	147	7.822491	1.566×10	4.35	β, α (tr)
831	In	49	60	8.864805	1.512×10	4.20	β
832	Hf	72	112	8.296871	1.483×10	4.12	β
833	Tb	65	84	8.551166	1.482×10	4.12	β, α (17)
834	Sn	50	60	8.851727	1.480×10	4.11	β
835	Sc	21	23		1.429×10	3.97	β
836	Zn	30	41	9.017370	1.426×10	3.96	β, IT (tr)
837	La	57	84	8.659540	1.411×10	3.92	β
838	La	57	76	8.714109	1.408×10	3.91	β
839	Sc	21	22	8.912907	1.401×10	3.89	β
840	Ir	77	118	8.233326	1.368×10	3.80	β, IT (5)
841	Hg	80	113		1.368×10	3.80	β
842	Lu	71	105		1.319×10	3.66	β, EC (0.1)
843	Lr	103	159	7.681556	1.296×10	3.60	SF, β, α
844	Pb	82	120		1.274×10	3.54	IT, β (9.5)
845	Y	39	53	8.993208	1.274×10	3.54	β
846	Po	84	120	8.161200	1.271×10	3.53	β, α (0.7)
847	Ce	58	74	8.696131	1.264×10	3.51	β
848	Tb	65	85	8.545394	1.253×10	3.48	β, α (tr)
849	Cd	48	69	8.808840	1.210×10	3.36	β
850	Cu	29	32	9.087452	1.200×10	3.33	β
851	Pb	82	127	8.155607	1.171×10	3.25	β	DP
852	Fm	100	154	7.752808	1.166×10	3.24	α, SF (0.06)
853	Bk	97	153	7.779523	1.156×10	3.21	β
854	Er	68	93	8.476352	1.156×10	3.21	β
855	Re	75	115	8.257433	1.152×10	3.20	β (54), IT
856	Y	39	51		1.148×10	3.19	IT, β (tr)
857	Au	79	112	8.248343	1.145×10	3.18	β
858	Ta	73	100	8.374218	1.130×10	3.14	β
859	Ag	47	65	8.844756	1.127×10	3.13	β
860	Cf	98	149	7.803566	1.120×10	3.11	β, α (0.04)
861	Ir	77	107	8.286599	1.112×10	3.09	β
862	Ir	77	113		1.111×10	3.09	β, IT (8.6)
863	Ti	22	23	8.938121	1.109×10	3.08	β
864	Ho	67	100	8.444304	1.081×10	3.00	β
865	Lr	103	161		1.081×10	3.00	SF
866	Sm	62	72		1.048×10	2.91	IT
867	Cm	96	143	7.857143	1.044×10	2.90	β, α (tr)
868	Tl	81	116	8.215190	1.022×10	2.84	β
869	Kr	36	52	8.976918	1.022×10	2.84	β
870	S	16	22	8.778196	1.022×10	2.84	β
871	Sr	38	49		1.013×10	2.82	IT, EC (0.3)
872	Sb	51	66	8.828977	1.008×10	2.80	β
873	Ac	89	135	7.980993	1.001×10	2.78	β, α (9.4), β(<1.6)
874	Tc	43	50	8.970274	9.900×10	2.75	β
875	Y	39	46		9.648×10	2.68	β
876	Pm	61	89	8.562014	9.648×10	2.68	β
877	Sr	38	54	8.972067	9.576×10	2.66	β
878	Fm	100	156	7.737398	9.456×10	2.63	SF, α (8.1)
879	Si	14	17	8.811618	9.438×10	2.62	β	CG
880	Mn	25	31	9.087572	9.284×10	2.58	β
881	Ni	28	37	9.073267	9.062×10	2.52	β
882	Ir	77	118		9×10	2.50	β
883	W	74	102	8.359055	9.000×10	2.50	β
884	Cd	48	69		8.964×10	2.49	β
885	Te	52	64	8.806414	8.964×10	2.49	β
886	Nd	60	81	8.668476	8.964×10	2.49	β
887	Ho	67	94	8.488737	8.928×10	2.48	β
888	Rn	86	124	8.117032	8.640×10	2.40	α (96), β
889	Pb	82	116	8.202893	8.640×10	2.40	β
890	Cm	96	142	7.863764	8.640×10	2.40	β, α
891	Br	35	48	9.023243	8.640×10	2.40	β
892	Dy	66	86	8.532670	8.568×10	2.38	β, α (0.1)	IM
893	Ta	73	105	8.355075	8.496×10	2.36	β
894	Pt	78	109	8.267638	8.460×10	2.35	β
895	Dy	66	99	8.456891	8.402×10	2.33	β
896	I	53	79	8.720570	8.262×10	2.30	β
897	Er	68	90	8.484619	8.244×10	2.29	β
898	Ge	32	34	9.004964	8.136×10	2.26	β
899	Ba	56	73	8.730746	8.028×10	2.23	β
900	Sm	62	88		7.992×10	2.22	β, α (tr?)
901	W	74	103	8.352118	7.920×10	2.20	β
902	Rh	45	61	8.884761	7.860×10	2.18	β
903	Ba	56	73		7.776×10	2.16	β, IT (tr?)
904	Pr	59	79	8.671088	7.632×10	2.12	β
905	I	53	68	8.784443	7.632×10	2.12	β
906	Sn	50	77	8.728800	7.560×10	2.10	β
907	Xe	54	69	8.764409	7.488×10	2.08	β
908	Pt	78	108	8.274897	7.488×10	2.08	β, α (tr)
909	Am	95	150	7.818674	7.380×10	2.05	β
910	Nb	41	48	8.977507	7.308×10	2.03	β
911	Os	76	119		7.2×10	2.00	β, IT (?)
912	In	49	68	8.828849	6.972×10	1.94	β, IT (47)
913	Ir	77	109		6.912×10	1.92	β, IT (~25)
914	Yb	70	107	8.359401	6.880×10	1.91	β
915	Tl	81	117		6.732×10	1.87	β, IT (44)
916	Tl	81	115	8.211618	6.624×10	1.84	β
917	Kr	36	47		6.588×10	1.83	IT
918	F	9	9	8.022789	6.585×10	1.83	β	CG,IM
919	Ar	18	23	8.877852	6.577×10	1.83	β	CG
920	Tm	69	94	8.456205	6.516×10	1.81	β
921	Pa	91	148	7.848148	6.480×10	1.80	β
922	Bi	83	118	8.177875	6.480×10	1.80	β, α
923	At	85	122	8.135303	6.480×10	1.80	β, α (~10)
924	Rn	86	138	7.971327	6.420×10	1.78	β
925	Sr	38	42	8.950177	6.378×10	1.77	β
926	Os	76	105	8.311935	6.300×10	1.75	β
927	Po	84	121	8.156737	6.264×10	1.74	β, α (0.04)
928	Nd	60	89	8.570529	6.221×10	1.73	β
929	Bi	83	119	8.173966	6.192×10	1.72	β, α (tr)
930	Es	99	150	7.785464	6.132×10	1.70	β~, α (0.6)
931	Tb	65	82	8.552634	6.120×10	1.70	β
932	Zr	40	47	8.983373	6.048×10	1.68	β
933	Ba	56	70	8.727439	6.000×10	1.67	β
934	In	49	64		5.968×10	1.66	IT
935	Co	27	34	9.102449	5.940×10	1.65	β
936	Ru	44	51	8.949749	5.915×10	1.64	β
937	Am	95	143	7.867882	5.880×10	1.63	β,α (tr)
938	At	85	123	8.131376	5.868×10	1.63	β, α (0.6)
939	Ce	58	75		5.82×10	1.62	β
940	Br	35	40	8.993181	5.802×10	1.61	β
941	Eu	63	89		5.76×10	1.60	IT
942	Md	101	158	7.709860	5.760×10	1.60	SF, α (<1.3)
943	Pt	78	119		5.725×10	1.59	IT, β (3.3)
944	Ra	88	142	7.921249	5.580×10	1.55	β
945	La	57	85	8.634954	5.466×10	1.52	β
946	As	33	45	9.004879	5.442×10	1.51	β
947	Pb	82	117	8.198111	5.400×10	1.50	β
948	Ge	32	46	8.992635	5.280×10	1.47	β
949	Cf	98	157	7.738739	5.100×10	1.42	β
950	Tl	81	115		5.076×10	1.41	β, IT (3.8)
951	Ir	77	119	8.219440	5.040×10	1.40	β, IT (<0.3)
952	I	53	79		4.993×10	1.39	IT, β (14)
953	Ba	56	83	8.682217	4.984×10	1.38	β
954	Ge	32	43	9.029413	4.967×10	1.38	β
955	I	53	67	8.769577	4.896×10	1.36	β
956	Db	105	161		4.8×10	1.33	α ?, SF ?, β ?
957	Md	101	155	7.729062	4.620×10	1.28	β, α (9.2), SF (<3)
958	Pr	59	78	8.678459	4.608×10	1.28	β
959	Kr	36	51	8.999022	4.578×10	1.27	β
960	Yb	70	94	8.443419	4.548×10	1.26	β
961	Er	68	95	8.471168	4.500×10	1.25	β
962	Kr	36	41	8.982618	4.464×10	1.24	β
963	Yb	70	108	8.350530	4.440×10	1.23	β
964	Am	95	142	7.874830	4.380×10	1.22	β,α (0.03)
965	Sm	62	80	8.627616	4.349×10	1.21	β
966	Nb	41	56	8.953864	4.326×10	1.20	β
967	Pt	78	107	8.269598	4.254×10	1.18	β
968	Tl	81	114	8.215712	4.176×10	1.16	β
969	Te	52	77		4.176×10	1.16	β
970	Ag	47	57	8.889702	4.152×10	1.15	β
971	In	49	61		4.146×10	1.15	β
972	Ta	73	101	8.368684	4.104×10	1.14	β
973	Ga	31	37	9.057888	4.063×10	1.13	β	IM
974	Sr	38	47		4.058×10	1.13	IT, β (13)
975	Ir	77	113		4.032×10	1.12	IT
976	Ho	67	95	8.478371	4.020×10	1.12	IT, β (38)
977	Pb	82	122		4.016×10	1.12	IT
978	Nb	41	48		3.96×10	1.10	β
979	Ag	47	56	8.894541	3.942×10	1.10	β
980	Cm	96	153	7.787191	3.849×10	1.07	β
981	Hf	72	111	8.307885	3.841×10	1.07	β
982	Ac	89	140	7.937048	3.762×10	1.05	β
983	Te	52	65	8.798652	3.720×10	1.03	β
984	Np	93	147	7.853348	3.714×10	1.03	β	DP
985	Hf	72	110		3.69×10	1.03	β, IT (46)
986	Bi	83	129	8.109617	3.633×10	1.01	β,α (36)	DP
987	Sb	51	65	8.816483	3.618×10	1.01	β
988	Tb	65	83	8.547949	3.600×10	1.00	β
989	Db	105	165		3.600×10	1.00	α, SF, ε?

Radionuclides with half-lives of 1 minute to 1 hour※

Radionuclides with half-lives of 1 second to 1 minute※

Radionuclides with half-lives less than 1 second※

See also※

• Isotope geochemistry
• List of elements by stability of isotopes
• List of radioactive nuclides by half-life
• Monoisotopic element
• Mononuclidic element
• Primordial nuclide
• Radionuclide
• Stable nuclide
• Table of nuclides

Sources※

Almost all data are taken from reference. For more recent updates, see reference. These sources do not indicate whether certain heavy isotopes starting from Lr, Rf, Db, ... (etc.) were produced, observed, or only predicted from estimated data.

Notes※

References※

External links※

• National Nuclear Data Center, Brookhaven National Laboratory
  • The 2016 Atomic Mass Evaluation, AMDC
• Karlsruhe Nuclide Chart, 9th edition, 2015, Joseph Magill, Gerda Pfennig, Raymond Dreher, Zsolt Sóti
• National Isotope Development Center Reference information on isotopes, and coordination and management of isotope production, availability, and distribution
• Isotope Development & Production for Research and Applications (IDPRA) U.S. Department of Energy program for isotope production and production research and development
  • Accelerator Systems and Stable Isotopes Group at ORNL
• Atomic Weights and Isotopic Compositions for All Elements U.S. National Institute of Standards and Technology
• Table of nuclides (compact, with energy per baryon) Overview picture for energy of nuclides