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Isotopes of yttrium

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. Twenty-six 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



|- | Y | style="text-align:right" | 39 | style="text-align:right" | 37 | 75.95845(54)# | 500# ns [>170 ns] | | | | |- | rowspan=2|Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 38 | rowspan=2|76.94965(7)# | rowspan=2|63(17) ms | p (>99.9%) | Sr | rowspan=2|5/2+# | rowspan=2| |- | β (<.1%) | Sr |- | Y | style="text-align:right" | 39 | style="text-align:right" | 39 | 77.94361(43)# | 54(5) ms | β | Sr | (0+) | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 0(500)# keV | 5.8(5) s | | | 5+# | |- | rowspan=2|Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 40 | rowspan=2|78.93735(48) | rowspan=2|14.8(6) s | β (>99.9%) | Sr | rowspan=2|(5/2+)# | rowspan=2| |- | β, p (<.1%) | Rb |- | Y | style="text-align:right" | 39 | style="text-align:right" | 41 | 79.93428(19) | 30.1(5) s | β | Sr | 4− | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 228.5(1) keV | 4.8(3) s | | | (1−) | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 312.6(9) keV | 4.7(3) µs | | | (2+) | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 42 | 80.92913(7) | 70.4(10) s | β | Sr | (5/2+) | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 43 | 81.92679(11) | 8.30(20) s | β | Sr | 1+ | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 402.63(14) keV | 268(25) ns | | | 4− | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 507.50(13) keV | 147(7) ns | | | 6+ | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 44 | 82.92235(5) | 7.08(6) min | β | Sr | 9/2+ | |- | rowspan=2 style="text-indent:1em" | Y | rowspan=2 colspan="3" style="text-indent:2em" | 61.98(11) keV | rowspan=2|2.85(2) min | β (60%) | Sr | rowspan=2|(3/2−) | rowspan=2| |- | IT (40%) | Y |- | Y | style="text-align:right" | 39 | style="text-align:right" | 45 | 83.92039(10) | 39.5(8) min | β | Sr | 1+ | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | −80(190) keV | 4.6(2) s | β | Sr | (5−) | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 46 | 84.916433(20) | 2.68(5) h | β | Sr | (1/2)− | |- | rowspan=2 style="text-indent:1em" | Y | rowspan=2 colspan="3" style="text-indent:2em" | 19.8(5) keV | rowspan=2|4.86(13) h | β (99.998%) | Sr | rowspan=2|9/2+ | rowspan=2| |- | IT (.002%) | Y |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 266.30(20) keV | 178(6) ns | | | 5/2− | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 47 | 85.914886(15) | 14.74(2) h | β | Sr | 4− | |- | rowspan=2 style="text-indent:1em" | Y | rowspan=2 colspan="3" style="text-indent:2em" | 218.30(20) keV | rowspan=2|48(1) min | IT (99.31%) | Y | rowspan=2|(8+) | rowspan=2| |- | β (.69%) | Sr |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 302.2(5) keV | 125(6) ns | | | (7−) | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 48 | 86.9108757(17) | 79.8(3) h | β | Sr | 1/2− | |- | rowspan=2 style="text-indent:1em" | Y | rowspan=2 colspan="3" style="text-indent:2em" | 380.82(7) keV | rowspan=2|13.37(3) h | IT (98.43%) | Y | rowspan=2|9/2+ | rowspan=2| |- | β (1.56%) | Sr |- | Y | style="text-align:right" | 39 | style="text-align:right" | 49 | 87.9095011(20) | 106.616(13) d | β | Sr | 4− | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 674.55(4) keV | 13.9(2) ms | IT | Y | (8)+ | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 392.86(9) keV | 300(3) µs | | | 1+ | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 50 | 88.9058483(27) | colspan=3 align=center|Stable | 1/2− | 1.0000 |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 908.97(3) keV | 15.663(5) s | IT | Y | 9/2+ | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 51 | 89.9071519(27) | 64.053(20) h | β | Zr | 2− | |- | rowspan=2 style="text-indent:1em" | Y | rowspan=2 colspan="3" style="text-indent:2em" | 681.67(10) keV | rowspan=2|3.19(6) h | IT (99.99%) | Y | rowspan=2|7+ | rowspan=2| |- | β (.0018%) | Zr |- | Y | style="text-align:right" | 39 | style="text-align:right" | 52 | 90.907305(3) | 58.51(6) d | β | Zr | 1/2− | |- | rowspan=2 style="text-indent:1em" | Y | rowspan=2 colspan="3" style="text-indent:2em" | 555.58(5) keV | rowspan=2|49.71(4) min | IT (98.5%) | Y | rowspan=2|9/2+ | rowspan=2| |- | β (1.5%) | Zr |- | Y | style="text-align:right" | 39 | style="text-align:right" | 53 | 91.908949(10) | 3.54(1) h | β | Zr | 2− | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 54 | 92.909583(11) | 10.18(8) h | β | Zr | 1/2− | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 758.719(21) keV | 820(40) ms | IT | Y | 7/2+ | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 55 | 93.911595(8) | 18.7(1) min | β | Zr | 2− | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 56 | 94.912821(8) | 10.3(1) min | β | Zr | 1/2− | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 57 | 95.915891(25) | 5.34(5) s | β | Zr | 0− | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 1140(30) keV | 9.6(2) s | β | Zr | (8)+ | |- | rowspan=2|Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 58 | rowspan=2|96.918134(13) | rowspan=2|3.75(3) s | β (99.942%) | Zr | rowspan=2|(1/2−) | rowspan=2| |- | β, n (.058%) | Zr |- | rowspan=3 style="text-indent:1em" | Y | rowspan=3 colspan="3" style="text-indent:2em" | 667.51(23) keV | rowspan=3|1.17(3) s | β (99.3%) | Zr | rowspan=3|(9/2)+ | rowspan=3| |- | IT (.7%) | Y |- | β, n (.08%) | Zr |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 3523.3(4) keV | 142(8) ms | | | (27/2−) | |- | rowspan=2|Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 59 | rowspan=2|97.922203(26) | rowspan=2|0.548(2) s | β (99.669%) | Zr | rowspan=2|(0)− | rowspan=2| |- | β, n (.331%) | Zr |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 170.74(6) keV | 620(80) ns | | | (2)− | |- | rowspan=3 style="text-indent:1em" | Y | rowspan=3 colspan="3" style="text-indent:2em" | 410(30) keV | rowspan=3|2.0(2) s | β (86.6%) | Zr | rowspan=3|(5+,4−) | rowspan=3| |- | IT (10%) | Y |- | β, n (3.4%) | Zr |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 496.19(15) keV | 7.6(4) µs | | | (2−) | |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 1181.1(4) keV | 0.83(10) µs | | | (8−) | |- | rowspan=2|Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 60 | rowspan=2|98.924636(26) | rowspan=2|1.470(7) s | β (98.1%) | Zr | rowspan=2|(5/2+) | rowspan=2| |- | β, n (1.9%) | Zr |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 2141.65(19) keV | 8.6(8) µs | | | (17/2+) | |- | rowspan=2|Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 61 | rowspan=2|99.92776(8) | rowspan=2|735(7) ms | β (98.98%) | Zr | rowspan=2|1−,2− | rowspan=2| |- | β, n (1.02%) | Zr |- | style="text-indent:1em" | Y | colspan="3" style="text-indent:2em" | 200(200)# keV | 940(30) ms | β | Zr | (3,4,5)(+#) | |- | rowspan=2|Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 62 | rowspan=2|100.93031(10) | rowspan=2|426(20) ms | β (98.06%) | Zr | rowspan=2|(5/2+) | rowspan=2| |- | β, n (1.94%) | Zr |- | rowspan=2|Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 63 | rowspan=2|101.93356(9) | rowspan=2|0.30(1) s | β (95.1%) | Zr | rowspan=2| | rowspan=2| |- | β, n (4.9%) | Zr |- | rowspan=2 style="text-indent:1em" | Y | rowspan=2 colspan="3" style="text-indent:2em" | 200(200)# keV | rowspan=2|360(40) ms | β (94%) | Zr | rowspan=2|high | rowspan=2| |- | β, n (6%) | Zr |- | rowspan=2|Y | rowspan=2 style="text-align:right" | 39 | rowspan=2 style="text-align:right" | 64 | rowspan=2|102.93673(32)# | rowspan=2|224(19) ms | β (91.7%) | Zr | rowspan=2|5/2+# | rowspan=2| |- | β, n (8.3%) | Zr |- | Y | style="text-align:right" | 39 | style="text-align:right" | 65 | 103.94105(43)# | 180(60) ms | β | Zr | | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 66 | 104.94487(54)# | 60# ms [>300 ns] | β | Zr | 5/2+# | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 67 | 105.94979(75)# | 50# ms [>300 ns] | β | Zr | | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 68 | 106.95414(54)# | 30# ms [>300 ns] | | | 5/2+# | |- | Y | style="text-align:right" | 39 | style="text-align:right" | 69 | 107.95948(86)# | 20# ms [>300 ns] | | | |