Pm
Promethium
Z 61 145.0 g/molLanthanide Radioactive
| 126Pm | 65 | 125.9573 | -39,750.0 | --- | 500.0 ms | --- | β⁺→126Nd β⁺p→125Pr | --- |
| 127Pm | 66 | 126.9514 | -45,310.0 | --- | 1.0 s | (3/2+) | β⁺→127Nd p→126Nd | --- |
| 128Pm | 67 | 127.9482 | -48,220.0 | --- | 1.0 s | (4+) | β⁺→128Nd(100%) β⁺p→127Pr | 1999 |
| 129Pm | 68 | 128.9429 | -53,180.0 | --- | 2.4 s | (5/2+) | β⁺→129Nd(100%) β⁺p→128Pr p→128Nd | 2004 |
| 130Pm | 69 | 129.9405 | -55,470.0 | --- | 2.6 s | (5+) | β⁺→130Nd(100%) β⁺p→129Pr | 1985 |
| 131Pm | 70 | 130.9358 | -59,770.0 | --- | 6.3 s | (11/2-) | β⁺→131Nd(100%) | 1998 |
| 132Pm | 71 | 131.9338 | -61,630.0 | --- | 6.2 s | (3+) | β⁺→132Nd(~100%) β⁺p→131Pr(5e-5%) | 1977 |
| 133Pm | 72 | 132.9298 | -65,410.0 | --- | 13.5 s | (3/2+) | β⁺→133Nd(100%) | 1977 |
| 133mPm | 72 | 132.9299 | -65,280.0 | --- | 8.0 s | (11/2-) | β⁺→133Nd γ→133Pm | 1996 |
| 134Pm | 73 | 133.9283 | -66,760.0 | --- | 22.0 s | (5+) | β⁺→134Nd(100%) | 1977 |
| 134mPm | 73 | 133.9284 | -66,710.0 | --- | --- | (2+) | β⁺→134Nd(100%) | 1988 |
| 134nPm | 73 | 133.9285 | -66,640.0 | --- | 20.0 µs | (7-) | γ→134Pm(100%) | 2009 |
| 135Pm | 74 | 134.9248 | -70,060.0 | --- | 49.0 s | (3/2+) | β⁺→135Nd(100%) | 1975 |
| 135mPm | 74 | 134.925 | -69,830.0 | --- | 40.0 s | (11/2-) | β⁺→135Nd(100%) | 1989 |
| 136Pm | 75 | 135.9236 | -71,170.0 | --- | 1.78 m | (7+) | β⁺→136Nd(100%) | 1988 |
| 136mPm | 75 | 135.9237 | -71,070.0 | --- | 1.5 m | (2+) | β⁺→136Nd(100%) | 1982 |
| 136nPm | 75 | 135.9236 | -71,130.0 | --- | 1.5 µs | (7-) | γ→136Pm(100%) | 1987 |
| 137Pm | 76 | 136.9205 | -74,073.0 | --- | 2.0 m | (5/2-) | β⁺→137Nd | 1975 |
| 137mPm | 76 | 136.9207 | -73,910.0 | --- | 2.4 m | 11/2- | β⁺→137Nd(100%) | 1973 |
| 138Pm | 77 | 137.9196 | -74,914.0 | --- | 3.24 m | (3-) | β⁺→138Nd(100%) | 1973 |
| 138mPm | 77 | 138.0 | 0.0 | --- | 10.0 s | (1+) | β⁺→138Nd(100%) | --- |
| 139Pm | 78 | 138.9168 | -77,501.0 | --- | 4.15 m | (5/2+) | β⁺→139Nd(100%) | 1967 |
| 139mPm | 78 | 138.917 | -77,312.0 | --- | 180.0 ms | (11/2-) | γ→139Pm(100%) β⁺→139Nd | 1975 |
| 140Pm | 79 | 139.916 | -78,212.0 | --- | 9.2 s | 1+ | β⁺→140Nd(100%) | 1966 |
| 140mPm | 79 | 139.9165 | -77,783.0 | --- | 5.95 m | 8- | β⁺→140Nd(100%) | 1966 |
| 141Pm | 80 | 140.9136 | -80,523.0 | --- | 20.9 m | 5/2+ | β⁺→141Nd(100%) | 1952 |
| 141mPm | 80 | 140.9142 | -79,894.0 | --- | 630.0 ns | 11/2- | γ→141Pm(100%) | 1970 |
| 141nPm | 80 | 140.9163 | -77,992.0 | --- | --- | (23/2+) | γ→141Pm(100%) | 1985 |
| 142Pm | 81 | 141.9129 | -81,142.0 | --- | 40.5 s | 1+ | β⁺→142Nd(100%) β⁺(77.1%) EC→142Nd(22.9%) | 1959 |
| 142mPm | 81 | 141.9138 | -80,259.0 | --- | 2.0 ms | (8-) | γ→142Pm(100%) | 1971 |
| 142nPm | 81 | 141.9159 | -78,313.0 | --- | 67.0 µs | (13-) | γ→142Pm(100%) | 1974 |
| 143Pm | 82 | 142.9109 | -82,960.7 | --- | 265.0 d | 5/2+ | EC→143Nd(~100%) β⁺(<5.7e-6%) | 1952 |
| 144Pm | 83 | 143.9126 | -81,416.1 | --- | 363.0 d | 5- | EC→144Nd(~100%) β⁺(<8e-5%) | 1952 |
| 144mPm | 83 | 143.9135 | -80,575.2 | --- | 780.0 ns | (9+) | γ→144Pm(100%) | 1993 |
| 144nPm | 83 | 143.9218 | -72,820.0 | --- | --- | (27+) | γ→144Pm(100%) | 1994 |
| 145Pm | 84 | 144.9128 | -81,267.5 | --- | 17.7 y | 5/2+ | EC→145Nd(~100%) α→141Pr(2.8e-7%) | 1951 |
| 146Pm | 85 | 145.9147 | -79,454.0 | --- | 5.53 y | 3- | EC→146Nd(66%) β⁻→146Sm(34%) | 1960 |
| 147Pm | 86 | 146.9151 | -79,042.0 | --- | 2.62 y | 7/2+ | β⁻→147Sm(100%) | 1947 |
| 148Pm | 87 | 147.9175 | -76,866.0 | --- | 5.37 d | 1- | β⁻→148Sm(100%) | 1947 |
| 148mPm | 87 | 147.9176 | -76,728.0 | --- | 41.29 d | 5- | β⁻→148Sm(95.8%) γ→148Pm(4.2%) | 1951 |
| 149Pm | 88 | 148.9183 | -76,064.4 | --- | 2.21 d | 7/2+ | β⁻→149Sm(100%) | 1947 |
| 149mPm | 88 | 148.9186 | -75,824.2 | --- | 35.0 µs | 11/2- | γ→149Pm(100%) | 1966 |
| 150Pm | 89 | 149.921 | -73,597.0 | --- | 2.7 h | (1-) | β⁻→150Sm(100%) | 1952 |
| 151Pm | 90 | 150.9212 | -73,386.0 | --- | 1.18 d | 5/2+ | β⁻→151Sm(100%) | 1952 |
| 152Pm | 91 | 151.9235 | -71,254.0 | --- | 4.12 m | 1+ | β⁻→152Sm(100%) | 1958 |
| 152mPm | 91 | 151.9237 | -71,110.0 | --- | 7.52 m | (4-) | β⁻→152Sm(100%) | 1971 |
| 152nPm | 91 | 152.0 | 0.0 | --- | 13.8 m | (8) | β⁻→152Sm(100%) γ→152Pm | 1971 |
| 153Pm | 92 | 152.9242 | -70,648.0 | --- | 5.25 m | 5/2- | β⁻→153Sm(100%) | 1962 |
| 154Pm | 93 | 153.9267 | -68,267.0 | --- | 2.68 m | (4+) | β⁻→154Sm(100%) | 1958 |
| 154mPm | 93 | 153.9265 | -68,490.0 | --- | 1.73 m | (1-) | β⁻→154Sm(100%) | 1958 |
| 155Pm | 94 | 154.9281 | -66,940.0 | --- | 41.5 s | (5/2-) | β⁻→155Sm(100%) | 1982 |
| 156Pm | 95 | 155.9311 | -64,166.8 | --- | 27.4 s | 4+ | β⁻→156Sm(100%) | 1986 |
| 156mPm | 95 | 155.9313 | -64,016.5 | --- | 2.3 s | (1+) | γ→156Pm(98%) β⁻→156Sm(2%) | 2007 |
| 157Pm | 96 | 156.9331 | -62,297.0 | --- | 10.56 s | (5/2-) | β⁻→157Sm(100%) | 1987 |
| 158Pm | 97 | 157.9365 | -59,106.1 | --- | 4.8 s | (0+) | β⁻→158Sm(100%) | 1987 |
| 158mPm | 97 | 157.9367 | -58,960.0 | --- | --- | (5+) | γ→158Pm β⁻→158Sm | 2015 |
| 159Pm | 98 | 158.9393 | -56,554.0 | --- | 1.49 s | (5/2-) | β⁻→159Sm(100%) | 1998 |
| 159mPm | 98 | 158.9409 | -55,089.0 | --- | 4.42 µs | (17/2+) | γ→159Pm(100%) | 2015 |
| 160Pm | 99 | 159.9432 | -52,894.6 | --- | 725.0 ms | (6-) | β⁻→160Sm(100%) β⁻n→159Sm | 2012 |
| 160mPm | 99 | 159.9434 | -52,704.0 | --- | --- | (1-) | β⁻→160Sm γ→160Pm β⁻n→159Sm | 2020 |
| 161Pm | 100 | 160.9462 | -50,087.0 | --- | 1.05 s | (5/2-) | β⁻→161Sm(100%) β⁻n→160Sm | 2012 |
| 161mPm | 100 | 160.9473 | -49,121.0 | --- | 890.0 ns | (13/2+) | γ→161Pm(100%) | 2015 |
| 162Pm | 101 | 161.9506 | -46,040.0 | --- | 630.0 ms | (2+) | β⁻→162Sm(100%) β⁻n→161Sm | 2012 |
| 163Pm | 102 | 162.9539 | -42,960.0 | --- | 255.0 ms | (5/2-) | β⁻→163Sm(100%) β⁻n→162Sm | 2012 |
| 164Pm | 103 | 163.9588 | -38,360.0 | --- | 300.0 ms | (5-) | β⁻→164Sm β⁻n→163Sm | 2018 |
| 165Pm | 104 | 164.9628 | -34,670.0 | --- | 260.0 ms | (5/2-) | β⁻→165Sm β⁻n→164Sm | 2018 |