氪的同位素
圖表

| 符號 | Z> 激發能量 | N> 激發能量 | 同位素質量（u） > 激發能量 | 半衰期 | 衰變方式 | 衰變產物 | 原子核 自旋 | 相對豐度 （莫耳分率） | 相對豐度 的變化量 （莫耳分率） |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 69Kr | 36 | 33 | 68.96518(43)# | 32(10) ms | β+ | 69Br | 5/2-# |  |  |
| 70Kr | 36 | 34 | 69.95526(41)# | 52(17) ms | β+ | 70Br | 0+ |  |  |
| 71Kr | 36 | 35 | 70.94963(70) | 100(3) ms | β+ (94.8%) | 71Br | (5/2)- |  |  |
| 71Kr | 36 | 35 | 70.94963(70) | 100(3) ms | β+, p (5.2%) | 70Se | (5/2)- |  |  |
| 72Kr | 36 | 36 | 71.942092(9) | 17.16(18) s | β+ | 72Br | 0+ |  |  |
| 73Kr | 36 | 37 | 72.939289(7) | 28.6(6) s | β+ (99.32%) | 73Br | 3/2- |  |  |
| 73Kr | 36 | 37 | 72.939289(7) | 28.6(6) s | β+, p (.68%) | 72Se | 3/2- |  |  |
| 73mKr | 433.66(12) keV | 433.66(12) keV | 433.66(12) keV | 107(10) ns |  |  | (9/2+) |  |  |
| 74Kr | 36 | 38 | 73.9330844(22) | 11.50(11) min | β+ | 74Br | 0+ |  |  |
| 75Kr | 36 | 39 | 74.930946(9) | 4.29(17) min | β+ | 75Br | 5/2+ |  |  |
| 76Kr | 36 | 40 | 75.925910(4) | 14.8(1) h | β+ | 76Br | 0+ |  |  |
| 77Kr | 36 | 41 | 76.9246700(21) | 74.4(6) min | β+ | 77Br | 5/2+ |  |  |
| 78Kr | 36 | 42 | 77.9203648(12) | 9.2 +5.5 −2.6 +1.3 −×1021 y | 双电子捕获 | 78Se | 0+ | 0.00355(3) |  |
| 79Kr | 36 | 43 | 78.920082(4) | 35.04(10) h | β+ | 79Br | 1/2- |  |  |
| 79mKr | 129.77(5) keV | 129.77(5) keV | 129.77(5) keV | 50(3) s |  |  | 7/2+ |  |  |
| 80Kr | 36 | 44 | 79.9163790(16) | 稳定 | 稳定 | 稳定 | 0+ | 0.02286(10) |  |
| 81Kr | 36 | 45 | 80.9165920(21) | 2.29(11)×105 a | ε | 81Br | 7/2+ | trace |  |
| 81mKr | 190.62(4) keV | 190.62(4) keV | 190.62(4) keV | 13.10(3) s | IT (99.975%) | 81Kr | 1/2- |  |  |
| 81mKr | 190.62(4) keV | 190.62(4) keV | 190.62(4) keV | 13.10(3) s | ε (.025%) | 81Br | 1/2- |  |  |
| 82Kr | 36 | 46 | 81.9134836(19) | 稳定 | 稳定 | 稳定 | 0+ | 0.11593(31) |  |
| 83Kr | 36 | 47 | 82.914136(3) | 稳定 | 稳定 | 稳定 | 9/2+ | 0.11500(19) |  |
| 83m1Kr | 9.4053(8) keV | 9.4053(8) keV | 9.4053(8) keV | 154.4(11) ns |  |  | 7/2+ |  |  |
| 83m2Kr | 41.5569(10) keV | 41.5569(10) keV | 41.5569(10) keV | 1.83(2) h | IT | 83Kr | 1/2- |  |  |
| 84Kr | 36 | 48 | 83.911507(3) | 稳定 | 稳定 | 稳定 | 0+ | 0.56987(15) |  |
| 84mKr | 3236.02(18) keV | 3236.02(18) keV | 3236.02(18) keV | 1.89(4) µs |  |  | 8+ |  |  |
| 85Kr | 36 | 49 | 84.9125273(21) | 10.776(3) a | β− | 85Rb | 9/2+ | trace |  |
| 85m1Kr | 304.871(20) keV | 304.871(20) keV | 304.871(20) keV | 4.480(8) h | β− (78.6%) | 85Rb | 1/2- |  |  |
| 85m1Kr | 304.871(20) keV | 304.871(20) keV | 304.871(20) keV | 4.480(8) h | IT (21.4%) | 85Kr | 1/2- |  |  |
| 85m2Kr | 1991.8(13) keV | 1991.8(13) keV | 1991.8(13) keV | 1.6(7) µs [1.2(+10-4) µs] |  |  | (17/2+) |  |  |
| 86Kr | 36 | 50 | 85.91061073(11) | 觀測上穩定 | 觀測上穩定 | 觀測上穩定 | 0+ | 0.17279(41) |  |
| 87Kr | 36 | 51 | 86.91335486(29) | 76.3(5) min | β− | 87Rb | 5/2+ |  |  |
| 88Kr | 36 | 52 | 87.914447(14) | 2.84(3) h | β− | 88Rb | 0+ |  |  |
| 89Kr | 36 | 53 | 88.91763(6) | 3.15(4) min | β− | 89Rb | 3/2(+#) |  |  |
| 90Kr | 36 | 54 | 89.919517(20) | 32.32(9) s | β− | 90mRb | 0+ |  |  |
| 91Kr | 36 | 55 | 90.92345(6) | 8.57(4) s | β− | 91Rb | 5/2(+) |  |  |
| 92Kr | 36 | 56 | 91.926156(13) | 1.840(8) s | β− (99.96%) | 92Rb | 0+ |  |  |
| 92Kr | 36 | 56 | 91.926156(13) | 1.840(8) s | β−, n (.033%) | 91Rb | 0+ |  |  |
| 93Kr | 36 | 57 | 92.93127(11) | 1.286(10) s | β− (98.05%) | 93Rb | 1/2+ |  |  |
| 93Kr | 36 | 57 | 92.93127(11) | 1.286(10) s | β−, n (1.95%) | 92Rb | 1/2+ |  |  |
| 94Kr | 36 | 58 | 93.93436(32)# | 210(4) ms | β− (94.3%) | 94Rb | 0+ |  |  |
| 94Kr | 36 | 58 | 93.93436(32)# | 210(4) ms | β−, n (5.7%) | 93Rb | 0+ |  |  |
| 95Kr | 36 | 59 | 94.93984(43)# | 114(3) ms | β− | 95Rb | 1/2(+) |  |  |
| 96Kr | 36 | 60 | 95.94307(54)# | 80(7) ms | β− | 96Rb | 0+ |  |  |
| 97Kr | 36 | 61 | 96.94856(54)# | 63(4) ms | β− | 97Rb | 3/2+# |  |  |
| 97Kr | 36 | 61 | 96.94856(54)# | 63(4) ms | β−, n | 96Rb | 3/2+# |  |  |
| 98Kr | 36 | 62 | 97.95191(64)# | 46(8) ms |  |  | 0+ |  |  |
| 99Kr | 36 | 63 | 98.95760(64)# | 40(11) ms |  |  | (3/2+)# |  |  |
| 100Kr | 36 | 64 | 99.96114(54)# | 10# ms [>300 ns] |  |  | 0+ |  |  |
| 101Kr | 36 | 65 | unknown | >635 ns | β−, 2n | 99Rb | unknown |  |  |
| 101Kr | 36 | 65 | unknown | >635 ns | β−, n | 100Rb | unknown |  |  |
| 101Kr | 36 | 65 | unknown | >635 ns | β− | 101Rb | unknown |  |  |
1 2 3  畫上#號的數據代表沒有經過實驗的証明，僅為理論推測。
1 2 3 4  用括號括起來的數據代表不確定性。
↑  半衰期超过5亿年的同位素以粗體表示。
↑  穩定的衰變產物以粗體表示。
↑  半衰期超过5亿年的衰变产物以粗斜体表示。
↑  用于测量地下水的年龄
1 2 3 4  裂变产物
↑  以前用于定义米的长度
↑  被认为会双β衰变成86Sr
| 0 | 1 | 2 |
| --- | --- | --- |

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