# Isotopes of yttrium

Natural yttrium ($_{39}$Y) is composed of a single isotope yttrium-89. The most stable radioisotopes are $^{88}$Y, which has a half-life of 106.6 days, and $^{91}$Y, with a half-life of 58.51 days. All the other isotopes have half-lives of less than a day, except $^{87}$Y, which has a half-life of 79.8 hours, and $^{90}$Y, with 64 hours. The dominant decay mode below the stable $^{89}$Y is electron capture and the dominant mode after it is beta emission. Thirty-five unstable isotopes have been characterized.
$^{90}$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 |
| Isotopic abundance |||
| $^{76}$Y | 39 | 37 | 75.95894(32)# | 28(9) ms | β$^+$? | $^{76}$Sr | 1−# | |
| $^{76}$Y | 39 | 37 | 75.95894(32)# | 28(9) ms | p? | $^{75}$Sr | 1−# | |
| $^{76}$Y | 39 | 37 | 75.95894(32)# | 28(9) ms | β$^+$, p? | $^{75}$Rb | 1−# | |
| $^{77}$Y | 39 | 38 | 76.95015(22)# | 63(17) ms | β$^+$ | $^{77}$Sr | 5/2+# | |
| $^{77}$Y | 39 | 38 | 76.95015(22)# | 63(17) ms | p? | $^{76}$Sr | 5/2+# | |
| $^{77}$Y | 39 | 38 | 76.95015(22)# | 63(17) ms | β$^+$, p? | $^{76}$Rb | 5/2+# | |
| $^{78}$Y | 39 | 39 | 77.94399(32)# | 54(5) ms | β$^+$ | $^{78}$Sr | (0+) | |
| $^{78}$Y | 39 | 39 | 77.94399(32)# | 54(5) ms | β$^+$, p? | $^{77}$Rb | (0+) | |
| $^{78m}$Y | 0(500)# keV | 0(500)# keV | 0(500)# keV | 5.8(6) s | β$^+$ | $^{78}$Sr | (5+) | |
| $^{78m}$Y | 0(500)# keV | 0(500)# keV | 0(500)# keV | 5.8(6) s | β$^+$, p? | $^{77}$Rb | (5+) | |
| $^{79}$Y | 39 | 40 | 78.937946(86) | 14.8(6) s | β$^+$ | $^{79}$Sr | 5/2+# | |
| $^{80}$Y | 39 | 41 | 79.9343548(67) | 30.1(5) s | β$^+$ | $^{80}$Sr | 4− | |
| $^{80m1}$Y | 228.5(1) keV | 228.5(1) keV | 228.5(1) keV | 4.8(3) s | IT (81%) | $^{80}$Y | 1− | |
| $^{80m1}$Y | 228.5(1) keV | 228.5(1) keV | 228.5(1) keV | 4.8(3) s | β$^+$ (19%) | $^{80}$Sr | 1− | |
| $^{80m2}$Y | 312.6(9) keV | 312.6(9) keV | 312.6(9) keV | 4.7(3) μs | IT | $^{80}$Y | (2+) | |
| $^{81}$Y | 39 | 42 | 80.9294543(58) | 70.4(10) s | β$^+$ | $^{81}$Sr | (5/2+) | |
| $^{82}$Y | 39 | 43 | 81.9269302(59) | 8.30(20) s | β$^+$ | $^{82}$Sr | 1+ | |
| $^{82m1}$Y | 402.63(14) keV | 402.63(14) keV | 402.63(14) keV | 258(22) ns | IT | $^{82}$Y | 4− | |
| $^{82m2}$Y | 507.50(13) keV | 507.50(13) keV | 507.50(13) keV | 148(6) ns | IT | $^{82}$Y | 6+ | |
| $^{83}$Y | 39 | 44 | 82.922484(20) | 7.08(8) min | β$^+$ | $^{83}$Sr | (9/2+) | |
| $^{83m}$Y | 62.04(10) keV | 62.04(10) keV | 62.04(10) keV | 2.85(2) min | β$^+$ (60%) | $^{83}$Sr | (3/2−) | |
| $^{83m}$Y | 62.04(10) keV | 62.04(10) keV | 62.04(10) keV | 2.85(2) min | IT (40%) | $^{83}$Y | (3/2−) | |
| $^{84}$Y | 39 | 45 | 83.9206711(46) | 39.5(8) min | β$^+$ | $^{84}$Sr | (6+) | |
| $^{84m1}$Y | 67.0(2) keV | 67.0(2) keV | 67.0(2) keV | 4.6(2) s | β$^+$ | $^{84}$Sr | 1+ | |
| $^{84m2}$Y | 210.42(16) keV | 210.42(16) keV | 210.42(16) keV | 292(10) ns | IT | $^{84}$Y | 4− | |
| $^{85}$Y | 39 | 46 | 84.916433(20) | 2.68(5) h | β$^+$ | $^{85}$Sr | (1/2)− | |
| $^{85m1}$Y | 19.68(17) keV | 19.68(17) keV | 19.68(17) keV | 4.86(20) h | β$^+$ | $^{85}$Sr | (9/2)+ | |
| $^{85m1}$Y | 19.68(17) keV | 19.68(17) keV | 19.68(17) keV | 4.86(20) h | IT? | $^{85}$Y | (9/2)+ | |
| $^{85m2}$Y | 266.18(10) keV | 266.18(10) keV | 266.18(10) keV | 178(7) ns | IT | $^{85}$Y | (5/2)− | |
| $^{86}$Y | 39 | 47 | 85.914886(15) | 14.74(2) h | β$^+$ | $^{86}$Sr | 4− | |
| $^{86m1}$Y | 218.21(9) keV | 218.21(9) keV | 218.21(9) keV | 47.4(4) min | IT (99.31%) | $^{86}$Y | (8+) | |
| $^{86m1}$Y | 218.21(9) keV | 218.21(9) keV | 218.21(9) keV | 47.4(4) min | β$^+$ (0.69%) | $^{86}$Sr | (8+) | |
| $^{86m2}$Y | 302.18(9) keV | 302.18(9) keV | 302.18(9) keV | 125.3(55) ns | IT | $^{86}$Y | 6+ | |
| $^{87}$Y | 39 | 48 | 86.9108761(12) | 79.8(3) h | β$^+$ | $^{87}$Sr | 1/2− | |
| $^{87m}$Y | 380.82(7) keV | 380.82(7) keV | 380.82(7) keV | 13.37(3) h | IT (98.43%) | $^{87}$Y | 9/2+ | |
| $^{87m}$Y | 380.82(7) keV | 380.82(7) keV | 380.82(7) keV | 13.37(3) h | β$^+$ (1.57%) | $^{87}$Sr | 9/2+ | |
| $^{88}$Y | 39 | 49 | 87.9095013(16) | 106.629(24) d | β$^+$ | $^{88}$Sr | 4− | |
| $^{88m1}$Y | 392.86(9) keV | 392.86(9) keV | 392.86(9) keV | 301(3) μs | IT | $^{88}$Y | 1+ | |
| $^{88m2}$Y | 674.55(4) keV | 674.55(4) keV | 674.55(4) keV | 13.98(17) ms | IT | $^{88}$Y | 8+ | |
| $^{89}$Y | 39 | 50 | 88.90583816(36) | Stable | Stable | Stable | 1/2− | 1.0000 |
| $^{89m}$Y | 908.97(3) keV | 908.97(3) keV | 908.97(3) keV | 15.663(5) s | IT | $^{89}$Y | 9/2+ | |
| $^{90}$Y | 39 | 51 | 89.90714175(38) | 64.05(5) h | β$^−$ | $^{90}$Zr | 2− | |
| $^{90m}$Y | 682.01(5) keV | 682.01(5) keV | 682.01(5) keV | 3.226(11) h | IT | $^{90}$Y | 7+ | |
| $^{90m}$Y | 682.01(5) keV | 682.01(5) keV | 682.01(5) keV | 3.226(11) h | β$^−$ (0.0018%) | $^{90}$Zr | 7+ | |
| $^{91}$Y | 39 | 52 | 90.9072980(20) | 58.51(6) d | β$^−$ | $^{91}$Zr | 1/2− | |
| $^{91m}$Y | 555.58(5) keV | 555.58(5) keV | 555.58(5) keV | 49.71(4) min | IT | $^{91}$Y | 9/2+ | |
| $^{91m}$Y | 555.58(5) keV | 555.58(5) keV | 555.58(5) keV | 49.71(4) min | β$^−$? | $^{91}$Zr | 9/2+ | |
| $^{92}$Y | 39 | 53 | 91.9089458(98) | 3.54(1) h | β$^−$ | $^{92}$Zr | 2− | |
| $^{92m}$Y | 807(50)# keV | 807(50)# keV | 807(50)# keV | 3.7(5) μs | IT | $^{92}$Y | 7+# | |
| $^{93}$Y | 39 | 54 | 92.909578(11) | 10.18(8) h | β$^−$ | $^{93}$Zr | 1/2− | |
| $^{93m}$Y | 758.719(21) keV | 758.719(21) keV | 758.719(21) keV | 820(40) ms | IT | $^{93}$Y | 9/2+ | |
| $^{94}$Y | 39 | 55 | 93.9115921(68) | 18.7(1) min | β$^−$ | $^{94}$Zr | 2− | |
| $^{94m}$Y | 1202.3(10) keV | 1202.3(10) keV | 1202.3(10) keV | 1.304(12) μs | IT | $^{94}$Y | (5+) | |
| $^{95}$Y | 39 | 56 | 94.9128197(73) | 10.3(1) min | β$^−$ | $^{95}$Zr | 1/2− | |
| $^{95m}$Y | 1087.6(6) keV | 1087.6(6) keV | 1087.6(6) keV | 48.6(5) μs | IT | $^{95}$Y | 9/2+ | |
| $^{96}$Y | 39 | 57 | 95.9159093(65) | 5.34(5) s | β$^−$ | $^{96}$Zr | 0− | |
| $^{96m1}$Y | 1540(9) keV | 1540(9) keV | 1540(9) keV | 9.6(2) s | β$^−$ | $^{96}$Zr | 8+ | |
| $^{96m2}$Y | 1655.0(11) keV | 1655.0(11) keV | 1655.0(11) keV | 181(9) ns | IT | $^{96}$Y | (6+) | |
| $^{97}$Y | 39 | 58 | 96.9182867(72) | 3.75(3) s | β$^−$ (99.945%) | $^{97}$Zr | 1/2− | |
| $^{97}$Y | 39 | 58 | 96.9182867(72) | 3.75(3) s | β$^−$, n (0.055%) | $^{96}$Zr | 1/2− | |
| $^{97m1}$Y | 667.52(23) keV | 667.52(23) keV | 667.52(23) keV | 1.17(3) s | β$^−$ (>99.2%) | $^{97}$Zr | 9/2+ | |
| $^{97m1}$Y | 667.52(23) keV | 667.52(23) keV | 667.52(23) keV | 1.17(3) s | IT (<0.7%) | $^{97}$Y | 9/2+ | |
| $^{97m1}$Y | 667.52(23) keV | 667.52(23) keV | 667.52(23) keV | 1.17(3) s | β$^−$, n (0.11%) | $^{96}$Zr | 9/2+ | |
| $^{97m2}$Y | 3522.6(4) keV | 3522.6(4) keV | 3522.6(4) keV | 142(8) ms | IT (94.8%) | $^{97}$Y | (27/2−) | |
| $^{97m2}$Y | 3522.6(4) keV | 3522.6(4) keV | 3522.6(4) keV | 142(8) ms | β$^−$ (5.2%) | $^{97}$Zr | (27/2−) | |
| $^{98}$Y | 39 | 59 | 97.9223948(85) | 548(2) ms | β$^−$ (99.67%) | $^{98}$Zr | 0− | |
| $^{98}$Y | 39 | 59 | 97.9223948(85) | 548(2) ms | β$^−$, n (0.33%) | $^{97}$Zr | 0− | |
| $^{98m1}$Y | 170.78(5) keV | 170.78(5) keV | 170.78(5) keV | 615(8) ns | IT | $^{98}$Y | 2− | |
| $^{98m2}$Y | 465.7(7) keV | 465.7(7) keV | 465.7(7) keV | 2.32(8) s | β$^−$ (96.56%) | $^{98}$Zr | (6,7)+ | |
| $^{98m2}$Y | 465.7(7) keV | 465.7(7) keV | 465.7(7) keV | 2.32(8) s | β$^−$, n (3.44%) | $^{97}$Zr | (6,7)+ | |
| $^{98m2}$Y | 465.7(7) keV | 465.7(7) keV | 465.7(7) keV | 2.32(8) s | IT? | $^{98}$Y | (6,7)+ | |
| $^{98m3}$Y | 496.10(11) keV | 496.10(11) keV | 496.10(11) keV | 6.90(54) μs | IT | $^{98}$Y | (4)− | |
| $^{98m4}$Y | 594(10) keV | 594(10) keV | 594(10) keV | 180(7) ns | IT | $^{98}$Y | (3−,4−) | |
| $^{98m5}$Y | 972.17(20) keV | 972.17(20) keV | 972.17(20) keV | 450(150) ns | IT | $^{98}$Y | (8+) | |
| $^{98m6}$Y | 1181.50(18) keV | 1181.50(18) keV | 1181.50(18) keV | 762(14) ns | IT | $^{98}$Y | (10−) | |
| $^{99}$Y | 39 | 60 | 98.9241608(71) | 1.484(7) s | β$^−$ (98.23%) | $^{99}$Zr | 5/2+ | |
| $^{99}$Y | 39 | 60 | 98.9241608(71) | 1.484(7) s | β$^−$, n (1.77%) | $^{98}$Zr | 5/2+ | |
| $^{99m}$Y | 2141.65(19) keV | 2141.65(19) keV | 2141.65(19) keV | 8.2(4) μs | IT | $^{99}$Y | (17/2+) | |
| $^{100}$Y | 39 | 61 | 99.927728(12) | 940(30) ms | β$^−$ | $^{100}$Zr | 4+ | |
| $^{100}$Y | 39 | 61 | 99.927728(12) | 940(30) ms | β$^−$, n? | $^{99}$Zr | 4+ | |
| $^{100m}$Y | 144(16) keV | 144(16) keV | 144(16) keV | 727(6) ms | β$^−$ (98.92%) | $^{100}$Zr | 1+# | |
| $^{100m}$Y | 144(16) keV | 144(16) keV | 144(16) keV | 727(6) ms | β$^−$, n (1.08%) | $^{99}$Zr | 1+# | |
| $^{101}$Y | 39 | 62 | 100.9301608(76) | 426(20) ms | β$^−$ (97.7%) | $^{101}$Zr | 5/2+ | |
| $^{101}$Y | 39 | 62 | 100.9301608(76) | 426(20) ms | β$^−$, n (2.3%) | $^{100}$Zr | 5/2+ | |
| $^{101m}$Y | 1205.0(10) keV | 1205.0(10) keV | 1205.0(10) keV | 870(90) ns | IT | $^{101}$Y | 13/2−# | |
| $^{102}$Y | 39 | 63 | 101.9343285(44) | 360(40) ms | β$^−$ (>97.4%) | $^{102}$Zr | (5−) | |
| $^{102}$Y | 39 | 63 | 101.9343285(44) | 360(40) ms | β$^−$, n (<2.6%) | $^{101}$Zr | (5−) | |
| $^{102m}$Y | 100(100)# keV | 100(100)# keV | 100(100)# keV | 300(100) ms | β$^−$ (>97.4%) | $^{102}$Zr | (0−,1−) | |
| $^{102m}$Y | 100(100)# keV | 100(100)# keV | 100(100)# keV | 300(100) ms | β$^−$, n (<2.6%) | $^{101}$Zr | (0−,1−) | |
| $^{102m}$Y | 100(100)# keV | 100(100)# keV | 100(100)# keV | 300(100) ms | IT? | $^{102}$Y | (0−,1−) | |
| $^{103}$Y | 39 | 64 | 102.937244(12) | 239(12) ms | β$^−$ (92.0%) | $^{103}$Zr | 5/2+# | |
| $^{103}$Y | 39 | 64 | 102.937244(12) | 239(12) ms | β$^−$, n (8.0%) | $^{102}$Zr | 5/2+# | |
| $^{104}$Y | 39 | 65 | 103.94194(22)# | 197(4) ms | β$^−$ (66%) | $^{104}$Zr | (0+,1+)# | |
| $^{104}$Y | 39 | 65 | 103.94194(22)# | 197(4) ms | β$^−$, n (34%) | $^{103}$Zr | (0+,1+)# | |
| $^{104}$Y | 39 | 65 | 103.94194(22)# | 197(4) ms | β$^−$, 2n? | $^{102}$Zr | (0+,1+)# | |
| $^{105}$Y | 39 | 66 | 104.94571(43)# | 95(9) ms | β$^−$ | $^{105}$Zr | 5/2+# | |
| $^{105}$Y | 39 | 66 | 104.94571(43)# | 95(9) ms | β$^−$, n (<82%) | $^{104}$Zr | 5/2+# | |
| $^{105}$Y | 39 | 66 | 104.94571(43)# | 95(9) ms | β$^−$, 2n? | $^{103}$Zr | 5/2+# | |
| $^{106}$Y | 39 | 67 | 105.95084(54)# | 75(6) ms | β$^−$ | $^{106}$Zr | 2+# | |
| $^{106}$Y | 39 | 67 | 105.95084(54)# | 75(6) ms | β$^−$, n? | $^{105}$Zr | 2+# | |
| $^{106}$Y | 39 | 67 | 105.95084(54)# | 75(6) ms | β$^−$, 2n? | $^{104}$Zr | 2+# | |
| $^{107}$Y | 39 | 68 | 106.95494(54)# | 33.5(3) ms | β$^−$ | $^{107}$Zr | 5/2+# | |
| $^{107}$Y | 39 | 68 | 106.95494(54)# | 33.5(3) ms | β$^−$, n? | $^{106}$Zr | 5/2+# | |
| $^{107}$Y | 39 | 68 | 106.95494(54)# | 33.5(3) ms | β$^−$, 2n? | $^{105}$Zr | 5/2+# | |
| $^{108}$Y | 39 | 69 | 107.96052(64)# | 30(5) ms | β$^−$ | $^{108}$Zr | 6−# | |
| $^{108}$Y | 39 | 69 | 107.96052(64)# | 30(5) ms | β$^−$, n? | $^{107}$Zr | 6−# | |
| $^{108}$Y | 39 | 69 | 107.96052(64)# | 30(5) ms | β$^−$, 2n? | $^{106}$Zr | 6−# | |
| $^{109}$Y | 39 | 70 | 108.96513(75)# | 25(5) ms | β$^−$ | $^{109}$Zr | 5/2+# | |
| $^{109}$Y | 39 | 70 | 108.96513(75)# | 25(5) ms | β$^−$, n? | $^{108}$Zr | 5/2+# | |
| $^{109}$Y | 39 | 70 | 108.96513(75)# | 25(5) ms | β$^−$, 2n? | $^{107}$Zr | 5/2+# | |
| $^{110}$Y | 39 | 71 | | | | | | |
| $^{111}$Y | 39 | 72 | | | | | | |
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* ↑ $^m$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).
* 1 2 3 # – 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.
* 1 2 Order of ground state and isomer is uncertain.
* 1 2 3 Fission product