Bk
Berkelium
Z 97 247.0 g/molActinide Radioactive
| 233Bk | 136 | 233.0567 | 52,770.0 | --- | 40.0 s | (3/2-) | α→229Am(82%) β⁺→233Cm | 2015 |
| 234Bk | 137 | 234.0573 | 53,400.0 | --- | 20.0 s | (3-) | α→230Am(>80%) β⁺→234Cm(<20%) | 2003 |
| 235Bk | 138 | 235.0567 | 52,770.0 | --- | 1.0 m | (3/2-) | β⁺→235Cm α→231Am | --- |
| 236Bk | 139 | 236.0575 | 53,540.0 | --- | 26.0 s | (4+) | β⁺→236Cm(99.96%) β⁺SF(0.04%) α→232Am | 2017 |
| 237Bk | 140 | 237.0571 | 53,210.0 | --- | 2.0 m | (3/2-) | β⁺→237Cm α→233Am | --- |
| 238Bk | 141 | 238.0582 | 54,220.0 | --- | 2.4 m | (1) | β⁺→238Cm(99.952%) β⁺SF(0.048%) α→234Am | 1994 |
| 239Bk | 142 | 239.0582 | 54,250.0 | --- | 1.67 m | (7/2+) | β⁺→239Cm(~100%) α→235Am(<0.01%) SF(<0.01%) | 1989 |
| 240Bk | 143 | 240.0598 | 55,660.0 | --- | 4.8 m | (7-) | β⁺SF(0.002%) β⁺→240Cm α→236Am | 1980 |
| 241Bk | 144 | 241.0601 | 55,980.0 | --- | 4.6 m | (7/2+) | β⁺→241Cm α→237Am | 2003 |
| 242Bk | 145 | 242.062 | 57,750.0 | --- | 7.0 m | (3+) | β⁺→242Cm(~100%) β⁺SF(<3e-5%) α→238Am | 1972 |
| 242mBk | 145 | 242.0641 | 59,750.0 | --- | 600.0 ns | --- | SF(100%) γ→242Bk | 1972 |
| 243Bk | 146 | 243.063 | 58,690.0 | --- | 4.6 h | 3/2- | β⁺→243Cm(~100%) α→239Am(0.15%) | 1950 |
| 244Bk | 147 | 244.0652 | 60,714.0 | --- | 5.02 h | 4- | α→240Am(0.006%) β⁺→244Cm | 1972 |
| 244mBk | 147 | 244.0668 | 62,210.0 | --- | 820.0 ns | --- | SF(100%) γ→244Bk | 1972 |
| 245Bk | 148 | 245.0664 | 61,813.8 | --- | 4.95 d | 3/2- | EC→245Cm(99.88%) α→241Am(0.12%) | 1951 |
| 246Bk | 149 | 246.0687 | 63,970.0 | --- | 1.8 d | (2-) | β⁺→246Cm(100%) α→242Am | 1954 |
| 247Bk | 150 | 247.0703 | 65,490.0 | --- | 1.38 ky | 3/2- | α→243Am(100%) SF | 1965 |
| 248Bk | 151 | 248.0731 | 68,130.0 | --- | --- | (6+) | α→244Am EC→248Cm | 1956 |
| 248mBk | 151 | 248.0731 | 68,108.0 | --- | 23.7 h | (1-) | β⁻→248Cf(70%) EC→248Cm(30%) α→244Am | 1956 |
| 249Bk | 152 | 249.075 | 69,846.3 | --- | 327.2 d | 7/2+ | β⁻→249Cf(~100%) α→245Am(0.001%) SF(4.7e-8%) | 1954 |
| 249mBk | 152 | 249.075 | 69,855.1 | --- | 300.0 µs | 3/2- | γ→249Bk(100%) | 1960 |
| 250Bk | 153 | 250.0783 | 72,952.0 | --- | 3.21 h | 2- | β⁻→250Cf(100%) | 1954 |
| 250mBk | 153 | 250.0784 | 72,987.6 | --- | 29.0 µs | 4+ | γ→250Bk(100%) | 1966 |
| 250nBk | 153 | 250.0784 | 73,038.0 | --- | 213.0 µs | 7+ | γ→250Bk(100%) | 1972 |
| 251Bk | 154 | 251.0808 | 75,228.0 | --- | 55.6 m | (3/2-) | β⁻→251Cf(100%) | 1967 |
| 251mBk | 154 | 251.0808 | 75,264.0 | --- | 58.0 µs | (7/2+) | γ→251Bk(100%) | 1966 |
| 252Bk | 155 | 252.0843 | 78,540.0 | --- | 1.8 m | --- | β⁻→252Cf α→248Am | 1988 |
| 253Bk | 156 | 253.0869 | 80,930.0 | --- | 1.0 h | (3/2-) | β⁻→253Cf | 1991 |
| 254Bk | 157 | 254.0906 | 84,390.0 | --- | 1.0 m | --- | β⁻→254Cf | --- |