Isotopes of yttrium

Natural yttrium (₃₉Y) is composed of the single stable isotope, ⁸⁹Y. The most stable radioisotopes are ⁸⁸Y, which has a half-life of 106.63 days, and ⁹¹Y, with a half-life of 58.51 days. All the other isotopes and isomers have half-lives of less than 15 hours, except ⁸⁷Y with 79.8 hours and ⁹⁰Y with 64.05 hours. The dominant decay mode below the stable ⁸⁹Y is electron capture to isotopes of strontium and the dominant mode after it is beta emission to isotopes of zirconium.

Isotopes of yttrium (₃₉Y)

Main isotopes Decay Isotope abun­dance half-life (t1/2) mode pro­duct ^87Y synth 79.8 h ε ^87Sr ^88Y synth 106.63 d ε ^88Sr ^89Y 100% stable ^90Y synth 64.05 h β^− ^90Zr ^91Y synth 58.51 d β^− ^91Zr
Standard atomic weight Ar°(Y)
	88.905838±0.000002 88.906±0.001 (abridged)
view talk edit

In total, the isotopes characterized range from ⁷⁶Y to ¹⁰⁹Y.

In products of nuclear fission, ⁹⁰Y exists in equilibrium with its parent isotope strontium-90. This isotope alone is also used in medicine; see yttrium-90.

List of isotopes

Nuclide	Z	N	Isotopic mass (Da)	Half-life	Decay mode	Daughter isotope	Spin and parity	Isotopic abundance
	Excitation energy
^76Y	39	37	75.95894(32)#	28(9) ms	β^+?	^76Sr	1−#
					p?	^75Sr
					β^+, p?	^75Rb
^77Y	39	38	76.95015(22)#	63(17) ms	β^+	^77Sr	5/2+#
					p?	^76Sr
					β^+, p?	^76Rb
^78Y	39	39	77.94399(32)#	54(5) ms	β^+	^78Sr	(0+)
					β^+, p?	^77Rb
^78mY	~300 keV			5.8(6) s	β^+	^78Sr	(5+)
					β^+, p?	^77Rb
^79Y	39	40	78.937752(14)	14.8(6) s	β^+	^79Sr	5/2+#
^80Y	39	41	79.9343548(67)	30.1(5) s	β^+	^80Sr	4−
^80m1Y	228.5(1) keV			4.8(3) s	IT (81%)	^80Y	1−
					β^+ (19%)	^80Sr
^80m2Y	312.6(9) keV			4.7(3) μs	IT	^80Y	(2+)
^81Y	39	42	80.9294459(30)	70.4(10) s	β^+	^81Sr	(5/2+)
^82Y	39	43	81.9269302(59)	8.30(20) s	β^+	^82Sr	1+
^82m1Y	402.63(14) keV			258(22) ns	IT	^82Y	4−
^82m2Y	507.50(13) keV			148(6) ns	IT	^82Y	6+
^83Y	39	44	82.922484(20)	7.08(8) min	β^+	^83Sr	(9/2+)
^83mY	62.04(10) keV			2.85(2) min	β^+ (60%)	^83Sr	(3/2−)
					IT (40%)	^83Y
^84Y	39	45	83.9206711(46)	39.5(8) min	β^+	^84Sr	(6+)
^84m1Y	67.0(2) keV			4.6(2) s	β^+	^84Sr	1+
^84m2Y	210.42(16) keV			292(10) ns	IT	^84Y	4−
^85Y	39	46	84.916433(20)	2.68(5) h	β^+	^85Sr	(1/2)−
^85m1Y	19.68(17) keV			4.86(20) h	β^+	^85Sr	(9/2)+
					IT?	^85Y
^85m2Y	266.18(10) keV			178(7) ns	IT	^85Y	(5/2)−
^86Y	39	47	85.914886(15)	14.74(2) h	β^+	^86Sr	4−
^86m1Y	218.21(9) keV			47.4(4) min	IT (99.31%)	^86Y	(8+)
					β^+ (0.69%)	^86Sr
^86m2Y	302.18(9) keV			125.3(55) ns	IT	^86Y	6+
^87Y	39	48	86.9108761(12)	79.8(3) h	β^+	^87Sr	1/2−
^87mY	380.82(7) keV			13.37(3) h	IT (98.43%)	^87Y	9/2+
					β^+ (1.57%)	^87Sr
^88Y	39	49	87.9095013(16)	106.629(24) d	β^+	^88Sr	4−
^88m1Y	392.86(9) keV			301(3) μs	IT	^88Y	1+
^88m2Y	674.55(4) keV			13.98(17) ms	IT	^88Y	8+
^89Y	39	50	88.90583816(36)	Stable			1/2−	1.0000
^89mY	908.97(3) keV			15.663(5) s	IT	^89Y	9/2+
^90Y	39	51	89.90714175(38)	64.05(5) h	β^−	^90Zr	2−
^90mY	682.01(5) keV			3.226(11) h	IT	^90Y	7+
					β^− (0.0018%)	^90Zr
^91Y	39	52	90.9072980(20)	58.51(6) d	β^−	^91Zr	1/2−
^91mY	555.58(5) keV			49.71(4) min	IT	^91Y	9/2+
					β^−?	^91Zr
^92Y	39	53	91.9089458(98)	3.54(1) h	β^−	^92Zr	2−
^92mY	807(50)# keV			3.7(5) μs	IT	^92Y	7+#
^93Y	39	54	92.909578(11)	10.18(8) h	β^−	^93Zr	1/2−
^93mY	758.719(21) keV			820(40) ms	IT	^93Y	9/2+
^94Y	39	55	93.9115921(68)	18.7(1) min	β^−	^94Zr	2−
^94mY	1202.3(10) keV			1.304(12) μs	IT	^94Y	(5+)
^95Y	39	56	94.9128197(73)	10.3(1) min	β^−	^95Zr	1/2−
^95mY	1087.6(6) keV			48.6(5) μs	IT	^95Y	9/2+
^96Y	39	57	95.9159093(65)	5.34(5) s	β^−	^96Zr	0−
^96m1Y	1540(9) keV			9.6(2) s	β^−	^96Zr	8+
^96m2Y	1655.0(11) keV			181(9) ns	IT	^96Y	(6+)
^97Y	39	58	96.9182867(72)	3.75(3) s	β^− (99.945%)	^97Zr	1/2−
					β^−, n (0.055%)	^96Zr
^97m1Y	667.52(23) keV			1.17(3) s	β^− (>99.2%)	^97Zr	9/2+
					IT (<0.7%)	^97Y
					β^−, n (0.11%)	^96Zr
^97m2Y	3522.6(4) keV			142(8) ms	IT (94.8%)	^97Y	(27/2−)
					β^− (5.2%)	^97Zr
^98Y	39	59	97.9223948(85)	548(2) ms	β^− (99.67%)	^98Zr	0−
					β^−, n (0.33%)	^97Zr
^98m1Y	170.78(5) keV			615(8) ns	IT	^98Y	2−
^98m2Y	465.7(7) keV			2.32(8) s	β^− (96.56%)	^98Zr	(6,7)+
					β^−, n (3.44%)	^97Zr
					IT?	^98Y
^98m3Y	496.10(11) keV			6.90(54) μs	IT	^98Y	(4)−
^98m4Y	594(10) keV			180(7) ns	IT	^98Y	(3−,4−)
^98m5Y	972.17(20) keV			450(150) ns	IT	^98Y	(8+)
^98m6Y	1181.50(18) keV			762(14) ns	IT	^98Y	(10−)
^99Y	39	60	98.9241608(71)	1.484(7) s	β^− (98.23%)	^99Zr	5/2+
					β^−, n (1.77%)	^98Zr
^99mY	2141.65(19) keV			8.2(4) μs	IT	^99Y	(17/2+)
^100Y	39	61	99.927728(12)	940(30) ms	β^−	^100Zr	4+
					β^−, n?	^99Zr
^100mY	144(16) keV			727(6) ms	β^− (98.92%)	^100Zr	1+#
					β^−, n (1.08%)	^99Zr
^101Y	39	62	100.9301608(76)	426(20) ms	β^− (97.7%)	^101Zr	5/2+
					β^−, n (2.3%)	^100Zr
^101mY	1205.0(10) keV			870(90) ns	IT	^101Y	13/2−#
^102Y	39	63	101.9343285(44)	360(40) ms	β^− (>97.4%)	^102Zr	(5−)
					β^−, n (<2.6%)	^101Zr
^102mY	100(100)# keV			300(100) ms	β^− (>97.4%)	^102Zr	(0−,1−)
					β^−, n (<2.6%)	^101Zr
					IT?	^102Y
^103Y	39	64	102.937244(12)	239(12) ms	β^− (92.0%)	^103Zr	5/2+#
					β^−, n (8.0%)	^102Zr
^104Y	39	65	103.94194(22)#	197(4) ms	β^− (66%)	^104Zr	(0+,1+)#
					β^−, n (34%)	^103Zr
					β^−, 2n?	^102Zr
^105Y	39	66	104.94571(43)#	95(9) ms	β^−	^105Zr	5/2+#
					β^−, n (<82%)	^104Zr
					β^−, 2n?	^103Zr
^106Y	39	67	105.95084(54)#	75(6) ms	β^−	^106Zr	2+#
					β^−, n?	^105Zr
					β^−, 2n?	^104Zr
^107Y	39	68	106.95494(54)#	33.5(3) ms	β^−	^107Zr	5/2+#
					β^−, n?	^106Zr
					β^−, 2n?	^105Zr
^108Y	39	69	107.96052(64)#	30(5) ms	β^−	^108Zr	6−#
					β^−, n?	^107Zr
					β^−, 2n?	^106Zr
^109Y	39	70	108.96513(75)#	25(5) ms	β^−	^109Zr	5/2+#
					β^−, n?	^108Zr
					β^−, 2n?	^107Zr
^110Y	39	71
^111Y	39	72
This table header & footer: view

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

   IT:	Isomeric transition
   n:	Neutron emission
   p:	Proton emission

6. Bold italics symbol as daughter – Daughter product is nearly stable.
7. Bold symbol as daughter – Daughter product is stable.
8. ( ) spin value – Indicates spin with weak assignment arguments.
9. Order of ground state and isomer is uncertain.
10. Measured mass is 77.944220(16) Da.
11. Fission product

See also

Daughter products other than yttrium

• Isotopes of zirconium
• Isotopes of strontium
• Isotopes of rubidium