イットリウム（Y）の同位体のうち天然に存在するものは89Yのみである。最も安定な放射性同位体88Yの半減期は106.65日、91Yの半減期は58.51日である。87Y（半減期79.8時間）と90Y（半減期64時間）を除き、その他全ての半減期が1日以下である。最も安定な89Yよりも軽い同位体は電子捕獲、89Yよりも重い同位体はベータ崩壊する。26種類の不安定同位体が知られている。
90Yは核爆発により生成し、生成元の90Srと平衡状態になる。
一覧
| 同位体核種 | Z(p) | N(n) | 同位体質量 (u) | 半減期 | 核スピン数 | 天然存在比 | 天然存在比 (範囲) |
|---|---|---|---|---|---|---|---|
| 励起エネルギー | |||||||
| 76Y | 39 | 37 | 75.95845(54)# | 500# ns [>170 ns] | |||
| 77Y | 39 | 38 | 76.94965(7)# | 63(17) ms | 5/2+# | ||
| 78Y | 39 | 39 | 77.94361(43)# | 54(5) ms | (0+) | ||
| 78mY | 0(500)# keV | 5.8(5) s | 5+# | ||||
| 79Y | 39 | 40 | 78.93735(48) | 14.8(6) s | (5/2+)# | ||
| 80Y | 39 | 41 | 79.93428(19) | 30.1(5) s | 4- | ||
| 80m1Y | 228.5(1) keV | 4.8(3) s | (1-) | ||||
| 80m2Y | 312.6(9) keV | 4.7(3) µs | (2+) | ||||
| 81Y | 39 | 42 | 80.92913(7) | 70.4(10) s | (5/2+) | ||
| 82Y | 39 | 43 | 81.92679(11) | 8.30(20) s | 1+ | ||
| 82m1Y | 402.63(14) keV | 268(25) ns | 4- | ||||
| 82m2Y | 507.50(13) keV | 147(7) ns | 6+ | ||||
| 83Y | 39 | 44 | 82.92235(5) | 7.08(6) min | 9/2+ | ||
| 83mY | 61.98(11) keV | 2.85(2) min | (3/2-) | ||||
| 84Y | 39 | 45 | 83.92039(10) | 4.6(2) s | 1+ | ||
| 84mY | -80(190) keV | 39.5(8) min | (5-) | ||||
| 85Y | 39 | 46 | 84.916433(20) | 2.68(5) h | (1/2)- | ||
| 85m1Y | 19.8(5) keV | 4.86(13) h | 9/2+ | ||||
| 85m2Y | 266.30(20) keV | 178(6) ns | 5/2- | ||||
| 86Y | 39 | 47 | 85.914886(15) | 14.74(2) h | 4- | ||
| 86m1Y | 218.30(20) keV | 48(1) min | (8+) | ||||
| 86m2Y | 302.2(5) keV | 125(6) ns | (7-) | ||||
| 87Y | 39 | 48 | 86.9108757(17) | 79.8(3) h | 1/2- | ||
| 87mY | 380.82(7) keV | 13.37(3) h | 9/2+ | ||||
| 88Y | 39 | 49 | 87.9095011(20) | 106.616(13) d | 4- | ||
| 88m1Y | 674.55(4) keV | 13.9(2) ms | (8)+ | ||||
| 88m2Y | 392.86(9) keV | 300(3) µs | 1+ | ||||
| 89Y | 39 | 50 | 88.9058483(27) | STABLE | 1/2- | 1.0000 | |
| 89mY | 908.97(3) keV | 15.663(5) s | 9/2+ | ||||
| 90Y | 39 | 51 | 89.9071519(27) | 64.053(20) h | 2- | ||
| 90mY | 681.67(10) keV | 3.19(6) h | 7+ | ||||
| 91Y | 39 | 52 | 90.907305(3) | 58.51(6) d | 1/2- | ||
| 91mY | 555.58(5) keV | 49.71(4) min | 9/2+ | ||||
| 92Y | 39 | 53 | 91.908949(10) | 3.54(1) h | 2- | ||
| 93Y | 39 | 54 | 92.909583(11) | 10.18(8) h | 1/2- | ||
| 93mY | 758.719(21) keV | 820(40) ms | 7/2+ | ||||
| 94Y | 39 | 55 | 93.911595(8) | 18.7(1) min | 2- | ||
| 95Y | 39 | 56 | 94.912821(8) | 10.3(1) min | 1/2- | ||
| 96Y | 39 | 57 | 95.915891(25) | 5.34(5) s | 0- | ||
| 96mY | 1140(30) keV | 9.6(2) s | (8)+ | ||||
| 97Y | 39 | 58 | 96.918134(13) | 3.75(3) s | (1/2-) | ||
| 97m1Y | 667.51(23) keV | 1.17(3) s | (9/2)+ | ||||
| 97m2Y | 3523.3(4) keV | 142(8) ms | (27/2-) | ||||
| 98Y | 39 | 59 | 97.922203(26) | 0.548(2) s | (0)- | ||
| 98m1Y | 170.74(6) keV | 620(80) ns | (2)- | ||||
| 98m2Y | 410(30) keV | 2.0(2) s | (5+,4-) | ||||
| 98m3Y | 496.19(15) keV | 7.6(4) µs | (2-) | ||||
| 98m4Y | 1181.1(4) keV | 0.83(10) µs | (8-) | ||||
| 99Y | 39 | 60 | 98.924636(26) | 1.470(7) s | (5/2+) | ||
| 99mY | 2141.65(19) keV | 8.6(8) µs | (17/2+) | ||||
| 100Y | 39 | 61 | 99.92776(8) | 735(7) ms | 1-,2- | ||
| 100mY | 200(200)# keV | 940(30) ms | (3,4,5)(+#) | ||||
| 101Y | 39 | 62 | 100.93031(10) | 426(20) ms | (5/2+) | ||
| 102Y | 39 | 63 | 101.93356(9) | 0.30(1) s | |||
| 102mY | 200(200)# keV | 360(40) ms | high | ||||
| 103Y | 39 | 64 | 102.93673(32)# | 224(19) ms | 5/2+# | ||
| 104Y | 39 | 65 | 103.94105(43)# | 180(60) ms | |||
| 105Y | 39 | 66 | 104.94487(54)# | 60# ms [>300 ns] | 5/2+# | ||
| 106Y | 39 | 67 | 105.94979(75)# | 50# ms [>300 ns] | |||
| 107Y | 39 | 68 | 106.95414(54)# | 30# ms [>300 ns] | 5/2+# | ||
| 108Y | 39 | 69 | 107.95948(86)# | 20# [>300 ns] | |||
参考文献
- Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.