Isotopes of yttrium

Nuclides with atomic number of 39. But with different mass numbers

Main isotopes			Decay
	abundance	half-life (t_1/2)	mode	product
Y	synth	3.4 d	ε	Sr
Y	synth	3.4 d	γ	–
Y	synth	106.6 d	ε	Sr
Y	synth	106.6 d	γ	–
Y	100%	stable
Y	synth	2.7 d	β	Zr
Y	synth	2.7 d	γ	–
Y	synth	58.5 d	β	Zr
Y	synth	58.5 d	γ	–

Standard atomic weight A_r°(Y)

88.905838±0.000002
88.906±0.001 (abridged)

Natural yttrium (₃₉Y) is: composed of a single isotope yttrium-89. The most stable radioisotopes are Y, which has a half-life of 106.6 days, "and Y," with a half-life of 58.51 days. All the: other isotopes have half-lives of less than a day, "except Y," which has a half-life of 79.8 hours, and Y, with 64 hours. The dominant decay mode below the——stable Y is electron capture and the dominant mode after it is beta emission. Thirty-five unstable isotopes have been characterized.

Y exists in equilibrium with its parent isotope strontium-90, which is a product of nuclear fission.

List of isotopes※

Nuclide	Z	N	Isotopic mass (Da)	Half-life	Decay mode	Daughter isotope	Spin and parity	Isotopic abundance
Nuclide	Excitation energy			Half-life	Decay mode	Daughter isotope	Spin and parity	Isotopic abundance
Y	39	37	75.95845(54)#	500# ns ※
Y	39	38	76.94965(7)#	63(17) ms	p (>99.9%)	Sr	5/2+#
Y	39	38	76.94965(7)#	63(17) ms	β (<.1%)	Sr	5/2+#
Y	39	39	77.94361(43)#	54(5) ms	β	Sr	(0+)
Y	0(500)# keV			5.8(5) s			5+#
Y	39	40	78.93735(48)	14.8(6) s	β (>99.9%)	Sr	(5/2+)#
Y	39	40	78.93735(48)	14.8(6) s	β, p (<.1%)	Rb	(5/2+)#
Y	39	41	79.93428(19)	30.1(5) s	β	Sr	4−
Y	228.5(1) keV			4.8(3) s			(1−)
Y	312.6(9) keV			4.7(3) μs			(2+)
Y	39	42	80.92913(7)	70.4(10) s	β	Sr	(5/2+)
Y	39	43	81.92679(11)	8.30(20) s	β	Sr	1+
Y	402.63(14) keV			268(25) ns			4−
Y	507.50(13) keV			147(7) ns			6+
Y	39	44	82.92235(5)	7.08(6) min	β	Sr	9/2+
Y	61.98(11) keV			2.85(2) min	β (60%)	Sr	(3/2−)
Y	61.98(11) keV			2.85(2) min	IT (40%)	Y	(3/2−)
Y	39	45	83.92039(10)	39.5(8) min	β	Sr	1+
Y	−80(190) keV			4.6(2) s	β	Sr	(5−)
Y	39	46	84.916433(20)	2.68(5) h	β	Sr	(1/2)−
Y	19.8(5) keV			4.86(13) h	β (99.998%)	Sr	9/2+
Y	19.8(5) keV			4.86(13) h	IT (.002%)	Y	9/2+
Y	266.30(20) keV			178(6) ns			5/2−
Y	39	47	85.914886(15)	14.74(2) h	β	Sr	4−
Y	218.30(20) keV			48(1) min	IT (99.31%)	Y	(8+)
Y	218.30(20) keV			48(1) min	β (.69%)	Sr	(8+)
Y	302.2(5) keV			125(6) ns			(7−)
Y	39	48	86.9108757(17)	79.8(3) h	β	Sr	1/2−
Y	380.82(7) keV			13.37(3) h	IT (98.43%)	Y	9/2+
Y	380.82(7) keV			13.37(3) h	β (1.56%)	Sr	9/2+
Y	39	49	87.9095011(20)	106.616(13) d	β	Sr	4−
Y	674.55(4) keV			13.9(2) ms	IT	Y	(8)+
Y	392.86(9) keV			300(3) μs			1+
Y	39	50	88.9058483(27)	Stable			1/2−	1.0000
Y	908.97(3) keV			15.663(5) s	IT	Y	9/2+
Y	39	51	89.9071519(27)	64.053(20) h	β	Zr	2−
Y	681.67(10) keV			3.19(6) h	IT (99.99%)	Y	7+
Y	681.67(10) keV			3.19(6) h	β (.0018%)	Zr	7+
Y	39	52	90.907305(3)	58.51(6) d	β	Zr	1/2−
Y	555.58(5) keV			49.71(4) min	IT (98.5%)	Y	9/2+
Y	555.58(5) keV			49.71(4) min	β (1.5%)	Zr	9/2+
Y	39	53	91.908949(10)	3.54(1) h	β	Zr	2−
Y	39	54	92.909583(11)	10.18(8) h	β	Zr	1/2−
Y	758.719(21) keV			820(40) ms	IT	Y	7/2+
Y	39	55	93.911595(8)	18.7(1) min	β	Zr	2−
Y	39	56	94.912821(8)	10.3(1) min	β	Zr	1/2−
Y	39	57	95.915891(25)	5.34(5) s	β	Zr	0−
Y	1140(30) keV			9.6(2) s	β	Zr	(8)+
Y	39	58	96.918134(13)	3.75(3) s	β (99.942%)	Zr	(1/2−)
Y	39	58	96.918134(13)	3.75(3) s	β, n (.058%)	Zr	(1/2−)
Y	667.51(23) keV			1.17(3) s	β (99.3%)	Zr	(9/2)+
					IT (.7%)	Y
					β, n (.08%)	Zr
Y	3523.3(4) keV			142(8) ms			(27/2−)
Y	39	59	97.922203(26)	0.548(2) s	β (99.669%)	Zr	(0)−
Y	39	59	97.922203(26)	0.548(2) s	β, n (.331%)	Zr	(0)−
Y	170.74(6) keV			620(80) ns			(2)−
Y	410(30) keV			2.0(2) s	β (86.6%)	Zr	(5+,4−)
					IT (10%)	Y
					β, n (3.4%)	Zr
Y	496.19(15) keV			7.6(4) μs			(2−)
Y	1181.1(4) keV			0.83(10) μs			(8−)
Y	39	60	98.924636(26)	1.470(7) s	β (98.1%)	Zr	(5/2+)
Y	39	60	98.924636(26)	1.470(7) s	β, n (1.9%)	Zr	(5/2+)
Y	2141.65(19) keV			8.6(8) μs			(17/2+)
Y	39	61	99.92776(8)	735(7) ms	β (98.98%)	Zr	1−,2−
Y	39	61	99.92776(8)	735(7) ms	β, n (1.02%)	Zr	1−,2−
Y	200(200)# keV			940(30) ms	β	Zr	(3,4,5)(+#)
Y	39	62	100.93031(10)	426(20) ms	β (98.06%)	Zr	(5/2+)
Y	39	62	100.93031(10)	426(20) ms	β, n (1.94%)	Zr	(5/2+)
Y	39	63	101.93356(9)	0.30(1) s	β (95.1%)	Zr
Y	39	63	101.93356(9)	0.30(1) s	β, n (4.9%)	Zr
Y	200(200)# keV			360(40) ms	β (94%)	Zr	high
Y	200(200)# keV			360(40) ms	β, n (6%)	Zr	high
Y	39	64	102.93673(32)#	224(19) ms	β (91.7%)	Zr	5/2+#
Y	39	64	102.93673(32)#	224(19) ms	β, n (8.3%)	Zr	5/2+#
Y	39	65	103.94105(43)#	180(60) ms	β	Zr
Y	39	66	104.94487(54)#	60# ms ※	β	Zr	5/2+#
Y	39	67	105.94979(75)#	50# ms ※	β	Zr
Y	39	68	106.95414(54)#	30# ms ※			5/2+#
Y	39	69	107.95948(86)#	20# ms ※
Y	39	70
Y	39	71
Y	39	72
This table header & footer: view

^ Y – Excited nuclear isomer.
^ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the "corresponding last digits."
^ # – Atomic mass marked #: value and "uncertainty derived not from purely experimental data." But at least partly from trends from the Mass Surface (TMS).
^ # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
^ Modes of decay:

IT: Isomeric transition

n: Neutron emission

p: Proton emission
^ Bold italics symbol as daughter – Daughter product is nearly stable.
^ Bold symbol as daughter – Daughter product is stable.
^ ( ) spin value – Indicates spin with weak assignment arguments.
^ Fission product

References※

^ "Standard Atomic Weights: Yttrium". CIAAW. 2021.
^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
^ Ohnishi, Tetsuya; Kubo, Toshiyuki; Kusaka, Kensuke; et al. (2010). "Identification of 45 New Neutron-Rich Isotopes Produced by, In-Flight Fission of a U Beam at 345 MeV/nucleon". J. Phys. Soc. Jpn. 79 (7). Physical Society of Japan: 073201. arXiv:1006.0305. Bibcode:2010JPSJ...79g3201T. doi:10.1143/JPSJ.79.073201.
^ Sumikama, T.; et al. (2021). "Observation of new neutron-rich isotopes in the vicinity of 110Zr". Physical Review C. 103 (1): 014614. Bibcode:2021PhRvC.103a4614S. doi:10.1103/PhysRevC.103.014614. hdl:10261/260248. S2CID 234019083.

Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.
- E. V. Marathe (July 1955). "The Half-Life of Yttrium-90". Journal of Scientific & Industrial Research (Vol 14B ed.): 354–355.

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