鐠的同位素
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） |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 121Pr | 59 | 62 | 120.95536(75)# | 600(300) ms | p | 120Ce | (3/2-) |  |
| 121Pr | 59 | 62 | 120.95536(75)# | 600(300) ms | β+ （不常見） | 121Ce | (3/2-) |  |
| 121Pr | 59 | 62 | 120.95536(75)# | 600(300) ms | β+, p （不常見） | 120La | (3/2-) |  |
| 122Pr | 59 | 63 | 121.95181(54)# | 500# ms | β+ | 122Ce |  |  |
| 123Pr | 59 | 64 | 122.94596(64)# | 800# ms | β+ | 123Ce | 3/2+# |  |
| 124Pr | 59 | 65 | 123.94296(64)# | 1.2(2) s | β+ | 124Ce |  |  |
| 124Pr | 59 | 65 | 123.94296(64)# | 1.2(2) s | β+, p （不常見） | 123La |  |  |
| 125Pr | 59 | 66 | 124.93783(43)# | 3.3(7) s | β+ | 125Ce | 3/2+# |  |
| 125Pr | 59 | 66 | 124.93783(43)# | 3.3(7) s | β+, p （不常見） | 124La | 3/2+# |  |
| 126Pr | 59 | 67 | 125.93531(21)# | 3.12(18) s | β+ | 126Ce | (4,5,6) |  |
| 126Pr | 59 | 67 | 125.93531(21)# | 3.12(18) s | β+, p （不常見） | 125La | (4,5,6) |  |
| 127Pr | 59 | 68 | 126.93083(21)# | 4.2(3) s | β+ | 127Ce | 3/2+# |  |
| 127mPr | 600(200)# keV | 600(200)# keV | 600(200)# keV | 50# ms |  |  | 11/2- |  |
| 128Pr | 59 | 69 | 127.92879(3) | 2.84(9) s | β+ | 128Ce | (3+) |  |
| 128Pr | 59 | 69 | 127.92879(3) | 2.84(9) s | β+, p （不常見） | 127La | (3+) |  |
| 129Pr | 59 | 70 | 128.92510(3) | 32(3) s | β+ | 129Ce | (11/2-) |  |
| 129mPr | 382.7(5) keV | 382.7(5) keV | 382.7(5) keV | 1# ms | β+ | 129Ce | (11/2-) |  |
| 130Pr | 59 | 71 | 129.92359(7) | 40.0(4) s | β+ | 130Ce | (6,7)(+#) |  |
| 130mPr | 100(100)# keV | 100(100)# keV | 100(100)# keV | 10# s |  |  | 2+# |  |
| 131Pr | 59 | 72 | 130.92026(6) | 1.50(3) min | β+ | 131Ce | (3/2+) |  |
| 131mPr | 152.4(2) keV | 152.4(2) keV | 152.4(2) keV | 5.7(2) s | IT (96.4%) | 131Pr | (11/2-) |  |
| 131mPr | 152.4(2) keV | 152.4(2) keV | 152.4(2) keV | 5.7(2) s | β+ (3.59%) | 131Ce | (11/2-) |  |
| 132Pr | 59 | 73 | 131.91926(6) | 1.49(11) min | β+ | 132Ce | (2+) |  |
| 132mPr | 0(100)# keV | 0(100)# keV | 0(100)# keV | 20# s | β+ | 132Ce | (5+) |  |
| 133Pr | 59 | 74 | 132.916331(13) | 6.5(3) min | β+ | 133Ce | (3/2+) |  |
| 133mPr | 192.05(14) keV | 192.05(14) keV | 192.05(14) keV | 1.1(2) µs |  |  | (11/2-) |  |
| 134Pr | 59 | 75 | 133.91571(4) | ~11 min | β+ | 134Ce | (5-) |  |
| 134mPr | 0(100)# keV | 0(100)# keV | 0(100)# keV | 17(2) min | β+ | 134Ce | 2- |  |
| 135Pr | 59 | 76 | 134.913112(13) | 24(2) min | β+ | 135Ce | 3/2(+) |  |
| 135mPr | 358.06(6) keV | 358.06(6) keV | 358.06(6) keV | 105(10) µs |  |  | (11/2-) |  |
| 136Pr | 59 | 77 | 135.912692(13) | 13.1(1) min | β+ | 136Ce | 2+ |  |
| 137Pr | 59 | 78 | 136.910705(13) | 1.28(3) h | β+ | 137Ce | 5/2+ |  |
| 137mPr | 561.22(23) keV | 561.22(23) keV | 561.22(23) keV | 2.66(7) µs |  |  | 11/2- |  |
| 138Pr | 59 | 79 | 137.910755(15) | 1.45(5) min | β+ | 138Ce | 1+ |  |
| 138mPr | 348(23) keV | 348(23) keV | 348(23) keV | 2.12(4) h | β+ | 138Ce | 7- |  |
| 139Pr | 59 | 80 | 138.908938(8) | 4.41(4) h | β+ | 139Ce | 5/2+ |  |
| 140Pr | 59 | 81 | 139.909076(7) | 3.39(1) min | β+ | 140Ce | 1+ |  |
| 140m1Pr | 127.5(3) keV | 127.5(3) keV | 127.5(3) keV | 0.35(2) µs |  |  | 5+ |  |
| 140m2Pr | 763.3(7) keV | 763.3(7) keV | 763.3(7) keV | 3.05(20) µs |  |  | (8)- |  |
| 141Pr | 59 | 82 | 140.9076528(26) | 稳定 | 稳定 | 稳定 | 5/2+ | 1.0000 |
| 142Pr | 59 | 83 | 141.9100448(26) | 19.12(4) h | β− (99.98%) | 142Nd | 2- |  |
| 142Pr | 59 | 83 | 141.9100448(26) | 19.12(4) h | ε (.0164%) | 142Ce | 2- |  |
| 142mPr | 3.694(3) keV | 3.694(3) keV | 3.694(3) keV | 14.6(5) min | IT | 142Pr | 5- |  |
| 143Pr | 59 | 84 | 142.9108169(28) | 13.57(2) d | β− | 143Nd | 7/2+ |  |
| 144Pr | 59 | 85 | 143.913305(4) | 17.28(5) min | β− | 144Nd | 0- |  |
| 144mPr | 59.03(3) keV | 59.03(3) keV | 59.03(3) keV | 7.2(3) min | IT (99.93%) | 144Pr | 3- |  |
| 144mPr | 59.03(3) keV | 59.03(3) keV | 59.03(3) keV | 7.2(3) min | β− (.07%) | 144Nd | 3- |  |
| 145Pr | 59 | 86 | 144.914512(8) | 5.984(10) h | β− | 145Nd | 7/2+ |  |
| 146Pr | 59 | 87 | 145.91764(7) | 24.15(18) min | β− | 146Nd | (2)- |  |
| 147Pr | 59 | 88 | 146.918996(25) | 13.4(4) min | β− | 147Nd | (3/2+) |  |
| 148Pr | 59 | 89 | 147.922135(28) | 2.29(2) min | β− | 148Nd | 1- |  |
| 148mPr | 50(30)# keV | 50(30)# keV | 50(30)# keV | 2.01(7) min | β− | 148Nd | (4) |  |
| 149Pr | 59 | 90 | 148.92372(9) | 2.26(7) min | β− | 149Nd | (5/2+) |  |
| 150Pr | 59 | 91 | 149.926673(28) | 6.19(16) s | β− | 150Nd | (1)- |  |
| 151Pr | 59 | 92 | 150.928319(25) | 18.90(7) s | β− | 151Nd | (3/2)(-#) |  |
| 152Pr | 59 | 93 | 151.93150(13) | 3.63(12) s | β− | 152Nd | 4+ |  |
| 153Pr | 59 | 94 | 152.93384(11) | 4.28(11) s | β− | 153Nd | 5/2-# |  |
| 154Pr | 59 | 95 | 153.93752(16) | 2.3(1) s | β− | 154Nd | (3+,2+) |  |
| 155Pr | 59 | 96 | 154.94012(32)# | 1# s [>300 ns] | β− | 155Nd | 5/2-# |  |
| 156Pr | 59 | 97 | 155.94427(43)# | 500# ms [>300 ns] | β− | 156Nd |  |  |
| 157Pr | 59 | 98 | 156.94743(43)# | 300# ms | β− | 157Nd | 5/2-# |  |
| 158Pr | 59 | 99 | 157.95198(64)# | 200# ms | β− | 158Nd |  |  |
| 159Pr | 59 | 100 | 158.95550(75)# | 100# ms | β− | 159Nd | 5/2-# |  |
1 2 3 4  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  用括號括起來的數據代表不確定性。
↑  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。
1 2  裂变产物
| 0 | 1 | 2 |
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