Природниот итриум (39Y) е составен од еден изотоп итриум-89. Најстабилни радиоизотопи се 88Y, кој има време на полураспад од 106,6 дена и 91Y, со време на полураспад од 58,51 дена. Сите други изотопи имаат време на полураспад помал од еден ден, освен 87Y, кој има време на полураспад од 79,8 часа и 90Y, со 64 часа. Главен режим на распаѓање под стабилниот 89Y е електронскиот зафат, а доминантен режим по него е бета-емисијата. Определени се својствата на 35 нестабилни изотопи.
90Y постои во рамнотежа со неговиот матичен изотоп стронциумот-90, кој е производ на јадрено цепење.
Список на изотопите
|-id=Итриум-76 | rowspan=3|76Y | rowspan=3 style="text-align:right" | 39 | rowspan=3 style="text-align:right" | 37 | rowspan=3|75,95894(32)# | rowspan=3|28(9) мс | β+? | 76Sr | rowspan=3|1−# | rowspan=3| |- | p? | 75Sr |- | β+, p? | 75Rb |-id=Итриум-77 | rowspan=3|77Y | rowspan=3 style="text-align:right" | 39 | rowspan=3 style="text-align:right" | 38 | rowspan=3|76,95015(22)# | rowspan=3|63(17) мс | β+ | 77Sr | rowspan=3|5/2+# | rowspan=3| |- | p? | 76Sr |- | β+, p? | 76Rb |-id=Итриум-78 | rowspan=2|78Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 39 | rowspan=2|77,94399(32)# | rowspan=2|54(5) мс | β+ | 78Sr | rowspan=2|(0+) | rowspan=2| |- | β+, p? | 77Rb |-id=Итриум-78m | rowspan=2 style="text-indent:1em" | 78mYРедоследот на основната состојба и изомерот е неизвесен. | rowspan=2 colspan="3" style="text-indent:2em" | 0(500)# keV | rowspan=2|5,8(6) с | β+ | 78Sr | rowspan=2|(5+) | rowspan=2| |- | β+, p? | 77Rb |-id=Итриум-79 | 79Y | style="text-align:right" | 39 | style="text-align:right" | 40 | 78,937946(86) | 14,8(6) с | β+ | 79Sr | 5/2+# | |-id=Итриум-80 | 80Y | style="text-align:right" | 39 | style="text-align:right" | 41 | 79,9343548(67) | 30,1(5) с | β+ | 80Sr | 4− | |-id=Итриум-80m1 | rowspan=2 style="text-indent:1em" | 80m1Y | rowspan=2 colspan="3" style="text-indent:2em" | 228,5(1) keV | rowspan=2|4,8(3) с | IT (81%) | 80Y | rowspan=2|1− | rowspan=2| |- | β+ (19%) | 80Sr |-id=Итриум-80m2 | style="text-indent:1em" | 80m2Y | colspan="3" style="text-indent:2em" | 312,6(9) keV | 4,7(3) μс | IT | 80Y | (2+) | |-id=Итриум-81 | 81Y | style="text-align:right" | 39 | style="text-align:right" | 42 | 80,9294543(58) | 70,4(10) с | β+ | 81Sr | (5/2+) | |-id=Итриум-82 | 82Y | style="text-align:right" | 39 | style="text-align:right" | 43 | 81,9269302(59) | 8,30(20) с | β+ | 82Sr | 1+ | |-id=Итриум-82m1 | style="text-indent:1em" | 82m1Y | colspan="3" style="text-indent:2em" | 402,63(14) keV | 258(22) нс | IT | 82Y | 4− | |-id=Итриум-82m2 | style="text-indent:1em" | 82m2Y | colspan="3" style="text-indent:2em" | 507,50(13) keV | 148(6) нс | IT | 82Y | 6+ | |-id=Итриум-83 | 83Y | style="text-align:right" | 39 | style="text-align:right" | 44 | 82,922484(20) | 7,08(8) мин | β+ | 83Sr | (9/2+) | |-id=Итриум-83m | rowspan=2 style="text-indent:1em" | 83mY | rowspan=2 colspan="3" style="text-indent:2em" | 62,04(10) keV | rowspan=2|2,85(2) мин | β+ (60%) | 83Sr | rowspan=2|(3/2−) | rowspan=2| |- | IT (40%) | 83Y |-id=Итриум-84 | 84Y | style="text-align:right" | 39 | style="text-align:right" | 45 | 83,9206711(46) | 39,5(8) мин | β+ | 84Sr | (6+) | |-id=Итриум-84m1 | style="text-indent:1em" | 84m1Y | colspan="3" style="text-indent:2em" | 67,0(2) keV | 4,6(2) с | β+ | 84Sr | 1+ | |-id=Итриум-84m2 | style="text-indent:1em" | 84m2Y | colspan="3" style="text-indent:2em" | 210,42(16) keV | 292(10) нс | IT | 84Y | 4− | |-id=Итриум-85 | 85Y | style="text-align:right" | 39 | style="text-align:right" | 46 | 84,916433(20) | 2,68(5) ч | β+ | 85Sr | (1/2)− | |-id=Итриум-85m1 | rowspan=2 style="text-indent:1em" | 85m1Y | rowspan=2 colspan="3" style="text-indent:2em" | 19,68(17) keV | rowspan=2|4,86(20) ч | β+ | 85Sr | rowspan=2|(9/2)+ | rowspan=2| |- | IT? | 85Y |-id=Итриум-85m2 | style="text-indent:1em" | 85m2Y | colspan="3" style="text-indent:2em" | 266,18(10) keV | 178(7) нс | IT | 85Y | (5/2)− | |-id=Итриум-86 | 86Y | style="text-align:right" | 39 | style="text-align:right" | 47 | 85,914886(15) | 14,74(2) ч | β+ | 86Sr | 4− | |-id=Итриум-86m1 | rowspan=2 style="text-indent:1em" | 86m1Y | rowspan=2 colspan="3" style="text-indent:2em" | 218,21(9) keV | rowspan=2|47,4(4) мин | IT (99,31%) | 86Y | rowspan=2|(8+) | rowspan=2| |- | β+ (0,69%) | 86Sr |-id=Итриум-86m2 | style="text-indent:1em" | 86m2Y | colspan="3" style="text-indent:2em" | 302,18(9) keV | 125,3(55) нс | IT | 86Y | 6+ | |-id=Итриум-87 | 87Y | style="text-align:right" | 39 | style="text-align:right" | 48 | 86,9108761(12) | 79,8(3) ч | β+ | 87Sr | 1/2− | |-id=Итриум-87m | rowspan=2 style="text-indent:1em" | 87mY | rowspan=2 colspan="3" style="text-indent:2em" | 380,82(7) keV | rowspan=2|13,37(3) ч | IT (98,43%) | 87Y | rowspan=2|9/2+ | rowspan=2| |- | β+ (1,57%) | 87Sr |-id=Итриум-88 | 88Y | style="text-align:right" | 39 | style="text-align:right" | 49 | 87,9095013(16) | 106,629(24) д | β+ | 88Sr | 4− | |-id=Итриум-88m1 | style="text-indent:1em" | 88m1Y | colspan="3" style="text-indent:2em" | 392,86(9) keV | 301(3) μс | IT | 88Y | 1+ | |-id=Итриум-88m2 | style="text-indent:1em" | 88m2Y | colspan="3" style="text-indent:2em" | 674,55(4) keV | 13,98(17) мс | IT | 88Y | 8+ | |-id=Итриум-89 | 89YФисионен производ | style="text-align:right" | 39 | style="text-align:right" | 50 | 88,90583816(36) | colspan=3 align=center|Стабилен | 1/2− | 1,0000 |-id=Итриум-89m | style="text-indent:1em" | 89mY | colspan="3" style="text-indent:2em" | 908,97(3) keV | 15,663(5) с | IT | 89Y | 9/2+
| 90Y | style="text-align:right" | 39 | style="text-align:right" | 51 | 89,90714175(38) | 64,05(5) ч | β− | 90Zr | 2− | |-id=Итриум-90m | rowspan=2 style="text-indent:1em" | 90mY | rowspan=2 colspan="3" style="text-indent:2em" | 682,01(5) keV | rowspan=2|3,226(11) ч | IT | 90Y | rowspan=2|7+ | rowspan=2| |- | β− (0,0018%) | 90Zr |-id=Итриум-91 | 91Y | style="text-align:right" | 39 | style="text-align:right" | 52 | 90,9072980(20) | 58,51(6) д | β− | 91Zr | 1/2− | |-id=Итриум-91m | rowspan=2 style="text-indent:1em" | 91mY | rowspan=2 colspan="3" style="text-indent:2em" | 555,58(5) keV | rowspan=2|49,71(4) мин | IT | 91Y | rowspan=2|9/2+ | rowspan=2| |- | β−? | 91Zr |-id=Итриум-92 | 92Y | style="text-align:right" | 39 | style="text-align:right" | 53 | 91,9089458(98) | 3,54(1) ч | β− | 92Zr | 2− | |-id=Итриум-92m | style="text-indent:1em" | 92mY | colspan="3" style="text-indent:2em" | 807(50)# keV | 3,7(5) μс | IT | 92Y | 7+# | |-id=Итриум-93 | 93Y | style="text-align:right" | 39 | style="text-align:right" | 54 | 92,909578(11) | 10,18(8) ч | β− | 93Zr | 1/2− | |-id=Итриум-93m | style="text-indent:1em" | 93mY | colspan="3" style="text-indent:2em" | 758,719(21) keV | 820(40) мс | IT | 93Y | 9/2+ | |-id=Итриум-94 | 94Y | style="text-align:right" | 39 | style="text-align:right" | 55 | 93,9115921(68) | 18,7(1) мин | β− | 94Zr | 2− | |-id=Итриум-94m | style="text-indent:1em" | 94mY | colspan="3" style="text-indent:2em" | 1202,3(10) keV | 1,304(12) μс | IT | 94Y | (5+) | |-id=Итриум-95 | 95Y | style="text-align:right" | 39 | style="text-align:right" | 56 | 94,9128197(73) | 10,3(1) мин | β− | 95Zr | 1/2− | |-id=Итриум-95m | style="text-indent:1em" | 95mY | colspan="3" style="text-indent:2em" | 1087,6(6) keV | 48,6(5) μс | IT | 95Y | 9/2+ | |-id=Итриум-96 | 96Y | style="text-align:right" | 39 | style="text-align:right" | 57 | 95,9159093(65) | 5,34(5) с | β− | 96Zr | 0− | |-id=Итриум-96m1 | style="text-indent:1em" | 96m1Y | colspan="3" style="text-indent:2em" | 1540(9) keV | 9,6(2) с | β− | 96Zr | 8+ | |-id=Итриум-96m2 | style="text-indent:1em" | 96m2Y | colspan="3" style="text-indent:2em" | 1655,0(11) keV | 181(9) нс | IT | 96Y | (6+) | |-id=Итриум-97 | rowspan=2|97Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 58 | rowspan=2|96,9182867(72) | rowspan=2|3,75(3) с | β− (99,945%) | 97Zr | rowspan=2|1/2− | rowspan=2| |- | β−, n (0,055%) | 96Zr |-id=Итриум-97m1 | rowspan=3 style="text-indent:1em" | 97m1Y | rowspan=3 colspan="3" style="text-indent:2em" | 667,52(23) keV | rowspan=3|1,17(3) с | β− (>99,2%) | 97Zr | rowspan=3|9/2+ | rowspan=3| |- | IT (<0,7%) | 97Y |- | β−, n (0,11%) | 96Zr |-id=Итриум-97m2 | rowspan=2 style="text-indent:1em" | 97m2Y | rowspan=2 colspan="3" style="text-indent:2em" | 3522,6(4) keV | rowspan=2|142(8) мс | IT (94,8%) | 97Y | rowspan=2|(27/2−) | rowspan=2| |- | β− (5,2%) | 97Zr |-id=Итриум-98 | rowspan=2|98Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 59 | rowspan=2|97,9223948(85) | rowspan=2|548(2) мс | β− (99,67%) | 98Zr | rowspan=2|0− | rowspan=2| |- | β−, n (0,33%) | 97Zr |-id=Итриум-98m1 | style="text-indent:1em" | 98m1Y | colspan="3" style="text-indent:2em" | 170,78(5) keV | 615(8) нс | IT | 98Y | 2− | |-id=Итриум-98m2 | rowspan=3 style="text-indent:1em" | 98m2Y | rowspan=3 colspan="3" style="text-indent:2em" | 465,7(7) keV | rowspan=3|2,32(8) с | β− (96,56%) | 98Zr | rowspan=3|(6,7)+ | rowspan=3| |- | β−, n (3,44%) | 97Zr |- | IT? | 98Y |-id=Итриум-98m3 | style="text-indent:1em" | 98m3Y | colspan="3" style="text-indent:2em" | 496,10(11) keV | 6,90(54) μс | IT | 98Y | (4)− | |-id=Итриум-98m4 | style="text-indent:1em" | 98m4Y | colspan="3" style="text-indent:2em" | 594(10) keV | 180(7) нс | IT | 98Y | (3−,4−) | |-id=Итриум-98m5 | style="text-indent:1em" | 98m5Y | colspan="3" style="text-indent:2em" | 972,17(20) keV | 450(150) нс | IT | 98Y | (8+) | |-id=Итриум-98m6 | style="text-indent:1em" | 98m6Y | colspan="3" style="text-indent:2em" | 1181,50(18) keV | 762(14) нс | IT | 98Y | (10−) | |-id=Итриум-99 | rowspan=2|99Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 60 | rowspan=2|98,9241608(71) | rowspan=2|1,484(7) с | β− (98,23%) | 99Zr | rowspan=2|5/2+ | rowspan=2| |- | β−, n (1,77%) | 98Zr |-id=Итриум-99m | style="text-indent:1em" | 99mY | colspan="3" style="text-indent:2em" | 2141,65(19) keV | 8,2(4) μс | IT | 99Y | (17/2+) | |-id=Итриум-100 | rowspan=2|100Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 61 | rowspan=2|99,927728(12) | rowspan=2|940(30) мс | β− | 100Zr | rowspan=2|4+ | rowspan=2| |- | β−, n? | 99Zr |-id=Итриум-100m | rowspan=2 style="text-indent:1em" | 100mY | rowspan=2 colspan="3" style="text-indent:2em" | 144(16) keV | rowspan=2|727(6) мс | β− (98,92%) | 100Zr | rowspan=2|1+# | rowspan=2| |- | β−, n (1,08%) | 99Zr |-id=Итриум-101 | rowspan=2|101Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 62 | rowspan=2|100,9301608(76) | rowspan=2|426(20) мс | β− (97,7%) | 101Zr | rowspan=2|5/2+ | rowspan=2| |- | β−, n (2,3%) | 100Zr |-id=Итриум-101m | style="text-indent:1em" | 101mY | colspan="3" style="text-indent:2em" | 1205,0(10) keV | 870(90) нс | IT | 101Y | 13/2−# | |-id=Итриум-102 | rowspan=2|102Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 63 | rowspan=2|101,9343285(44) | rowspan=2|360(40) мс | β− (>97,4%) | 102Zr | rowspan=2|(5−) | rowspan=2| |- | β−, n (<2,6%) | 101Zr |-id=Итриум-102m | rowspan=3 style="text-indent:1em" | 102mY | rowspan=3 colspan="3" style="text-indent:2em" | 100(100)# keV | rowspan=3|300(100) мс | β− (>97,4%) | 102Zr | rowspan=3|(0−,1−) | rowspan=3| |- | β−, n (<2,6%) | 101Zr |- | IT? | 102Y |-id=Итриум-103 | rowspan=2|103Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 64 | rowspan=2|102,937244(12) | rowspan=2|239(12) мс | β− (92,0%) | 103Zr | rowspan=2|5/2+# | rowspan=2| |- | β−, n (8,0%) | 102Zr |-id=Итриум-104 | rowspan=3|104Y | rowspan=3 style="text-align:right" | 39 | rowspan=3 style="text-align:right" | 65 | rowspan=3|103,94194(22)# | rowspan=3|197(4) мс | β− (66%) | 104Zr | rowspan=3|(0+,1+)# | rowspan=3| |- | β−, n (34%) | 103Zr |- | β−, 2n? | 102Zr |-id=Итриум-105 | rowspan=3|105Y | rowspan=3 style="text-align:right" | 39 | rowspan=3 style="text-align:right" | 66 | rowspan=3|104,94571(43)# | rowspan=3|95(9) мс | β− | 105Zr | rowspan=3|5/2+#