鋇的同位素
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） |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 114Ba | 56 | 58 | 113.95068(15) | 530(230) ms [0.43(+30−15) s] | β+, p (99.59%) | 113Xe | 0+ |  |  |
| 114Ba | 56 | 58 | 113.95068(15) | 530(230) ms [0.43(+30−15) s] | α (.37%) | 110Xe | 0+ |  |  |
| 114Ba | 56 | 58 | 113.95068(15) | 530(230) ms [0.43(+30−15) s] | β+ (.04%) | 114Cs | 0+ |  |  |
| 114Ba | 56 | 58 | 113.95068(15) | 530(230) ms [0.43(+30−15) s] | CD (<.0034%) | 102Sn, 12C | 0+ |  |  |
| 115Ba | 56 | 59 | 114.94737(64)# | 0.45(5) s | β+ | 115Cs | (5/2+)# |  |  |
| 115Ba | 56 | 59 | 114.94737(64)# | 0.45(5) s | β+, p | 114Xe | (5/2+)# |  |  |
| 116Ba | 56 | 60 | 115.94138(43)# | 1.3(2) s | β+ | 116Cs | 0+ |  |  |
| 116Ba | 56 | 60 | 115.94138(43)# | 1.3(2) s | β+, p | 115Xe | 0+ |  |  |
| 117Ba | 56 | 61 | 116.93850(32)# | 1.75(7) s | β+ | 117Cs | (3/2)(+#) |  |  |
| 117Ba | 56 | 61 | 116.93850(32)# | 1.75(7) s | β+, α | 113I | (3/2)(+#) |  |  |
| 117Ba | 56 | 61 | 116.93850(32)# | 1.75(7) s | β+, p | 116Xe | (3/2)(+#) |  |  |
| 118Ba | 56 | 62 | 117.93304(21)# | 5.2(2) s | β+ | 118Cs | 0+ |  |  |
| 118Ba | 56 | 62 | 117.93304(21)# | 5.2(2) s | β+, p | 117Xe | 0+ |  |  |
| 119Ba | 56 | 63 | 118.93066(21) | 5.4(3) s | β+ | 119Cs | (5/2+) |  |  |
| 119Ba | 56 | 63 | 118.93066(21) | 5.4(3) s | β+, p | 118Xe | (5/2+) |  |  |
| 120Ba | 56 | 64 | 119.92604(32) | 24(2) s | β+ | 120Cs | 0+ |  |  |
| 121Ba | 56 | 65 | 120.92405(15) | 29.7(15) s | β+ (99.98%) | 121Cs | 5/2(+) |  |  |
| 121Ba | 56 | 65 | 120.92405(15) | 29.7(15) s | β+, p (.02%) | 120Xe | 5/2(+) |  |  |
| 122Ba | 56 | 66 | 121.91990(3) | 1.95(15) min | β+ | 122Cs | 0+ |  |  |
| 123Ba | 56 | 67 | 122.918781(13) | 2.7(4) min | β+ | 123Cs | 5/2(+) |  |  |
| 124Ba | 56 | 68 | 123.915094(13) | 11.0(5) min | β+ | 124Cs | 0+ |  |  |
| 125Ba | 56 | 69 | 124.914473(12) | 3.5(4) min | β+ | 125Cs | 1/2(+#) |  |  |
| 126Ba | 56 | 70 | 125.911250(13) | 100(2) min | β+ | 126Cs | 0+ |  |  |
| 127Ba | 56 | 71 | 126.911094(12) | 12.7(4) min | β+ | 127Cs | 1/2+ |  |  |
| 127mBa | 80.33(12) keV | 80.33(12) keV | 80.33(12) keV | 1.9(2) s | IT | 127Ba | 7/2− |  |  |
| 128Ba | 56 | 72 | 127.908318(11) | 2.43(5) d | β+ | 128Cs | 0+ |  |  |
| 129Ba | 56 | 73 | 128.908679(12) | 2.23(11) h | β+ | 129Cs | 1/2+ |  |  |
| 129mBa | 8.42(6) keV | 8.42(6) keV | 8.42(6) keV | 2.16(2) h | β+ | 129Cs | 7/2+# |  |  |
| 129mBa | 8.42(6) keV | 8.42(6) keV | 8.42(6) keV | 2.16(2) h | IT | 129Ba | 7/2+# |  |  |
| 130Ba | 56 | 74 | 129.9063208(30) | 1.6(±1.1)×1021 yrs | DEC（英语：） | 130Xe | 0+ | 0.00106(1) |  |
| 130mBa | 2475.12(18) keV | 2475.12(18) keV | 2475.12(18) keV | 9.54(14) ms | IT | 130Ba | 8− |  |  |
| 131Ba | 56 | 75 | 130.906941(3) | 11.50(6) d | β+ | 131Cs | 1/2+ |  |  |
| 131mBa | 187.14(12) keV | 187.14(12) keV | 187.14(12) keV | 14.6(2) min | IT | 131Ba | 9/2− |  |  |
| 132Ba | 56 | 76 | 131.9050613(11) | 觀測上穩定 | 觀測上穩定 | 觀測上穩定 | 0+ | 0.00101(1) |  |
| 133Ba | 56 | 77 | 132.9060075(11) | 10.51(5) yrs | ε | 133Cs | 1/2+ |  |  |
| 133mBa | 288.247(9) keV | 288.247(9) keV | 288.247(9) keV | 38.9(1) h | IT (99.99%) | 133Ba | 11/2− |  |  |
| 133mBa | 288.247(9) keV | 288.247(9) keV | 288.247(9) keV | 38.9(1) h | ε (.0096%) | 133Cs | 11/2− |  |  |
| 134Ba | 56 | 78 | 133.9045084(4) | 稳定 | 稳定 | 稳定 | 0+ | 0.02417(18) |  |
| 135Ba | 56 | 79 | 134.9056886(4) | 稳定 | 稳定 | 稳定 | 3/2+ | 0.06592(12) |  |
| 135mBa | 268.22(2) keV | 268.22(2) keV | 268.22(2) keV | 28.7(2) h | IT | 135Ba | 11/2− |  |  |
| 136Ba | 56 | 80 | 135.9045759(4) | 稳定 | 稳定 | 稳定 | 0+ | 0.07854(24) |  |
| 136mBa | 2030.466(18) keV | 2030.466(18) keV | 2030.466(18) keV | 308.4(19) ms | IT | 136Ba | 7− |  |  |
| 137Ba | 56 | 81 | 136.9058274(5) | 稳定 | 稳定 | 稳定 | 3/2+ | 0.11232(24) |  |
| 137m1Ba | 661.659(3) keV | 661.659(3) keV | 661.659(3) keV | 2.552(1) min | IT | 137Ba | 11/2− |  |  |
| 137m2Ba | 2349.1(4) keV | 2349.1(4) keV | 2349.1(4) keV | 0.59(10) µs |  |  | (17/2−) |  |  |
| 138Ba | 56 | 82 | 137.9052472(5) | 稳定 | 稳定 | 稳定 | 0+ | 0.71698(42) |  |
| 138mBa | 2090.54(6) keV | 2090.54(6) keV | 2090.54(6) keV | 800(100) ns |  |  | 6+ |  |  |
| 139Ba | 56 | 83 | 138.9088413(5) | 83.06(28) min | β− | 139La | 7/2− |  |  |
| 140Ba | 56 | 84 | 139.910605(9) | 12.752(3) d | β− | 140La | 0+ |  |  |
| 141Ba | 56 | 85 | 140.914411(9) | 18.27(7) min | β− | 141La | 3/2− |  |  |
| 142Ba | 56 | 86 | 141.916453(7) | 10.6(2) min | β− | 142La | 0+ |  |  |
| 143Ba | 56 | 87 | 142.920627(14) | 14.5(3) s | β− | 143La | 5/2− |  |  |
| 144Ba | 56 | 88 | 143.922953(14) | 11.5(2) s | β− | 144La | 0+ |  |  |
| 145Ba | 56 | 89 | 144.92763(8) | 4.31(16) s | β− | 145La | 5/2− |  |  |
| 146Ba | 56 | 90 | 145.93022(8) | 2.22(7) s | β− (99.98%) | 146La | 0+ |  |  |
| 146Ba | 56 | 90 | 145.93022(8) | 2.22(7) s | β−, n (.02%) | 145La | 0+ |  |  |
| 147Ba | 56 | 91 | 146.93495(22)# | 0.893(1) s | β− (99.94%) | 147La | (3/2+) |  |  |
| 147Ba | 56 | 91 | 146.93495(22)# | 0.893(1) s | β−, n (.06%) | 146La | (3/2+) |  |  |
| 148Ba | 56 | 92 | 147.93772(9) | 0.612(17) s | β− (99.6%) | 148La | 0+ |  |  |
| 148Ba | 56 | 92 | 147.93772(9) | 0.612(17) s | β−, n (.4%) | 147La | 0+ |  |  |
| 149Ba | 56 | 93 | 148.94258(21)# | 344(7) ms | β− (99.57%) | 149La | 3/2−# |  |  |
| 149Ba | 56 | 93 | 148.94258(21)# | 344(7) ms | β−, n (.43%) | 148La | 3/2−# |  |  |
| 150Ba | 56 | 94 | 149.94568(43)# | 300 ms | β− | 150La | 0+ |  |  |
| 150Ba | 56 | 94 | 149.94568(43)# | 300 ms | β−, n （不常見） | 149La | 0+ |  |  |
| 151Ba | 56 | 95 | 150.95081(43)# | 200# ms [>300 ns] | β− | 151La | 3/2−# |  |  |
| 152Ba | 56 | 96 | 151.95427(54)# | 100# ms | β− | 152La | 0+ |  |  |
| 153Ba | 56 | 97 | 152.95961(86)# | 80# ms | β− | 153La | 5/2−# |  |  |
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。
↑  Cluster decay is predicted but had never been observed.
↑  Primordial radioisotope
↑  Believed to undergo β+β+ decay to 132Xe with a half-life over 300×1018 years
1 2 3 4 5 6 7  裂变产物
| 0 | 1 | 2 |
| --- | --- | --- |

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