Sm
Samarium
Z 62 150.36 g/molLanthanide
| 152Sm | 90 | 151.9197 | -74,763.0 | 26.74% | Stable | 0+ | --- | 1933 |
| 154Sm | 92 | 153.9222 | -72,455.6 | 22.74% | Stable | 0+ | β⁻ | 1933 |
| 147Sm | 85 | 146.9149 | -79,266.0 | 15.0% | 106.6 Gy | 7/2- | α→143Nd(100%) | 1933 |
| 149Sm | 87 | 148.9172 | -77,135.9 | 13.82% | Stable | 7/2- | α→145Nd | 1933 |
| 148Sm | 86 | 147.9148 | -79,336.1 | 11.25% | 6.3 Py | 0+ | α→144Nd(100%) | 1933 |
| 150Sm | 88 | 149.9173 | -77,051.3 | 7.37% | Stable | 0+ | --- | 1934 |
| 144Sm | 82 | 143.912 | -81,965.6 | 3.08% | Stable | 0+ | β⁺ | 1933 |
| 128Sm | 66 | 127.958 | -39,150.0 | --- | 500.0 ms | 0+ | β⁺→128Pm β⁺p→127Nd | --- |
| 129Sm | 67 | 128.9546 | -42,330.0 | --- | 550.0 ms | (1/2+) | β⁺→129Pm(100%) β⁺p→128Nd | 1999 |
| 130Sm | 68 | 129.9488 | -47,700.0 | --- | 1.0 s | 0+ | β⁺→130Pm | 1999 |
| 131Sm | 69 | 130.946 | -50,280.0 | --- | 1.2 s | (5/2+) | β⁺→131Pm(100%) β⁺p→130Nd | 1986 |
| 132Sm | 70 | 131.9408 | -55,140.0 | --- | 4.0 s | 0+ | β⁺→132Pm(100%) β⁺p→131Nd | 1989 |
| 133Sm | 71 | 132.9386 | -57,230.0 | --- | 2.89 s | (5/2+) | β⁺→133Pm(100%) β⁺p→132Nd | 1977 |
| 133mSm | 71 | 132.9387 | -57,110.0 | --- | 3.5 s | (1/2-) | β⁺→133Pm γ→133Sm β⁺p→132Nd | 1993 |
| 134Sm | 72 | 133.9341 | -61,380.0 | --- | 9.5 s | 0+ | β⁺→134Pm(100%) | 1977 |
| 135Sm | 73 | 134.9325 | -62,860.0 | --- | 10.3 s | (7/2+) | β⁺→135Pm(99.98%) β⁺p→134Nd(0.02%) | 1977 |
| 136Sm | 74 | 135.9283 | -66,811.0 | --- | 47.0 s | 0+ | β⁺→136Pm(100%) | 1982 |
| 136mSm | 74 | 135.9307 | -64,546.0 | --- | 15.0 µs | (8-) | γ→136Sm(100%) | 1994 |
| 137Sm | 75 | 136.927 | -67,992.0 | --- | 45.0 s | (9/2-) | β⁺→137Pm(100%) | 1986 |
| 137mSm | 75 | 136.9271 | -67,890.0 | --- | 20.0 s | (1/2+) | β⁺→137Pm | --- |
| 138Sm | 76 | 137.9232 | -71,498.0 | --- | 3.1 m | 0+ | β⁺→138Pm(100%) | 1982 |
| 139Sm | 77 | 138.9223 | -72,380.0 | --- | 2.57 m | 1/2+ | β⁺→139Pm(100%) | 1971 |
| 139mSm | 77 | 138.9228 | -71,923.0 | --- | 10.7 s | 11/2- | γ→139Sm(93.7%) β⁺→139Pm(6.3%) | 1973 |
| 140Sm | 78 | 139.919 | -75,456.0 | --- | 14.82 m | 0+ | β⁺→140Pm(100%) | 1967 |
| 141Sm | 79 | 140.9185 | -75,934.0 | --- | 10.2 m | 1/2+ | β⁺→141Pm(100%) | 1967 |
| 141mSm | 79 | 140.9187 | -75,758.0 | --- | 22.6 m | 11/2- | β⁺→141Pm(99.69%) γ→141Sm(0.31%) | 1967 |
| 142Sm | 80 | 141.9152 | -78,981.9 | --- | 1.21 h | 0+ | β⁺→142Pm(100%) β⁺(<5%) | 1959 |
| 142mSm | 80 | 141.9178 | -76,609.8 | --- | 170.0 ns | 7- | γ→142Sm(100%) | 1975 |
| 142nSm | 80 | 141.9191 | -75,319.7 | --- | 480.0 ns | 10+ | γ→142Sm(100%) | 1979 |
| 143Sm | 81 | 142.9146 | -79,517.1 | --- | 8.75 m | 3/2+ | β⁺→143Pm(100%) EC→143Pm(60%) β⁺(40%) | 1956 |
| 143mSm | 81 | 142.9154 | -78,763.1 | --- | 1.1 m | 11/2- | γ→143Sm(~100%) β⁺→143Pm(0.24%) | 1960 |
| 143nSm | 81 | 142.9176 | -76,723.3 | --- | 30.0 ms | 23/2- | γ→143Sm(100%) | 1969 |
| 144mSm | 82 | 143.9145 | -79,642.0 | --- | 880.0 ns | 6+ | γ→144Sm(100%) | 1972 |
| 145Sm | 83 | 144.9134 | -80,651.4 | --- | 340.0 d | 7/2- | EC→145Pm(100%) | 1947 |
| 145mSm | 83 | 144.9229 | -71,836.4 | --- | 3.52 µs | 49/2+ | γ→145Sm(100%) | 1993 |
| 146Sm | 84 | 145.913 | -80,996.0 | --- | 68.0 My | 0+ | α→142Nd(100%) | 1953 |
| 151Sm | 89 | 150.9199 | -74,576.5 | --- | 94.6 y | 5/2- | β⁻→151Eu(100%) | 1947 |
| 151mSm | 89 | 150.9202 | -74,315.4 | --- | 1.4 µs | (11/2-) | γ→151Sm(100%) | 1973 |
| 153Sm | 91 | 152.9221 | -72,560.1 | --- | 1.93 d | 3/2+ | β⁻→153Eu(100%) | 1938 |
| 153mSm | 91 | 152.9222 | -72,461.7 | --- | 10.6 ms | 11/2- | γ→153Sm(100%) | 1971 |
| 155Sm | 93 | 154.9246 | -70,191.2 | --- | 22.18 m | 3/2- | β⁻→155Eu(100%) | 1951 |
| 155mSm | 93 | 154.9247 | -70,174.7 | --- | 2.8 µs | 5/2+ | γ→155Sm(100%) | 2010 |
| 155nSm | 93 | 154.9252 | -69,653.2 | --- | 1.0 µs | 11/2- | γ→155Sm(100%) | 2010 |
| 156Sm | 94 | 155.9255 | -69,361.0 | --- | 9.4 h | 0+ | β⁻→156Eu(100%) | 1951 |
| 156mSm | 94 | 155.927 | -67,963.0 | --- | 185.0 ns | 5- | γ→156Sm(100%) | 1974 |
| 157Sm | 95 | 156.9284 | -66,678.0 | --- | 8.03 m | (3/2-) | β⁻→157Eu(100%) | 1973 |
| 158Sm | 96 | 157.9299 | -65,252.0 | --- | 5.3 m | 0+ | β⁻→158Eu(100%) | 1970 |
| 159Sm | 97 | 158.9332 | -62,208.0 | --- | 11.37 s | 5/2- | β⁻→159Eu(100%) | 1986 |
| 159mSm | 97 | 158.9346 | -60,932.0 | --- | 116.0 ns | (15/2+) | γ→159Sm(100%) | 2009 |
| 160Sm | 98 | 159.9353 | -60,233.2 | --- | 9.6 s | 0+ | β⁻→160Eu(100%) | 1986 |
| 160mSm | 98 | 159.9368 | -58,871.9 | --- | 120.0 ns | (5-) | γ→160Sm(100%) | 2009 |
| 160nSm | 98 | 159.9383 | -57,475.9 | --- | 1.8 µs | (11+) | γ→160Sm(100%) | 2016 |
| 161Sm | 99 | 160.9392 | -56,672.0 | --- | 4.8 s | (7/2+) | β⁻→161Eu(100%) | 1998 |
| 161mSm | 99 | 160.9407 | -55,284.0 | --- | 2.6 µs | (17/2-) | γ→161Sm(100%) | 2017 |
| 162Sm | 100 | 161.9416 | -54,379.0 | --- | 2.7 s | 0+ | β⁻→162Eu(100%) | 2005 |
| 162mSm | 100 | 161.9427 | -53,370.0 | --- | 1.78 µs | (4-) | γ→162Sm(100%) | 2017 |
| 163Sm | 101 | 162.9457 | -50,600.0 | --- | 1.3 s | (1/2-) | β⁻→163Eu(100%) | 2012 |
| 164Sm | 102 | 163.9486 | -47,925.0 | --- | 1.43 s | 0+ | β⁻→164Eu(100%) β⁻n→163Eu | 2012 |
| 164mSm | 102 | 163.9501 | -46,440.0 | --- | 600.0 ns | (6-) | γ→164Sm(100%) | 2014 |
| 165Sm | 103 | 164.9533 | -43,510.0 | --- | 980.0 ms | (5/2-) | β⁻→165Eu(100%) β⁻n→164Eu | 2012 |
| 166Sm | 104 | 165.9566 | -40,450.0 | --- | 800.0 ms | 0+ | β⁻→166Eu(100%) | 2017 |
| 167Sm | 105 | 166.9621 | -35,330.0 | --- | 190.0 ms | (7/2-) | β⁻→167Eu β⁻n→166Eu | 2018 |
| 168Sm | 106 | 167.966 | -31,640.0 | --- | 340.0 ms | (0+) | β⁻→168Eu β⁻n→167Eu | 2018 |