List of isotopes / atomic number 91 to atomic number 100
The list of isotopes is the overview page for easy access to all elements. The structure is also explained there and the legend for the table can also be found there. Decay energies were recalculated with the given masses and the mass-energy equivalent of .
91 Protactinium
isotope | Half-life | Decay energy (MeV) |
Spin / parity |
Type (s) of decay (%) |
Mass (u) |
---|---|---|---|---|---|
212 Pa | 5.1 ms | (3+) | α =? | ||
213 Pa | 5.3 ms | α =? | |||
214 Pa | 17 ms | α =? | |||
215 Pa | 14 ms | 8.17 | α | ||
216 Pa | 0.20 s | 8.10 (?) | α ≈ 98, ε ≈ 2 | ||
217 Pa | 4.9 ms | 8.49 | α | ||
217m1 Pa | 1.6 ms | 10,344 | α <100 | ||
218 Pa | 0.12 ms | 9.79 | α | ||
219 Pa | 53 ns | 10.08 | 9 / 2− | α ≈ 100, εβ + ≈ 5 · 10 −9 | |
220 Pa | 0.78 µs | 9.83 (α), 5.72 (εβ + ) | α ≈ 100, εβ + = 3 · 10 −7 | ||
221 Pa | 5.9 µs | 9.25 | 9 / 2− | α | |
222 Pa | 2.9 ms | 8.85 | α | ||
223 Pa | 6.5 ms | 8.34 | α ≈ 100, εβ + <1.0 · 10 −3 | ||
224 Pa | 0.79 s | 7.694 | α | ||
225 Pa | 1.7 s | 7.39 | α | ||
226 Pa | 1.8 min | 6.987 (α), 2.834 (εβ + ) | α = 74, εβ + = 26 | ||
227 Pa | 38.3 min | 6.580 (α), 1.019 (ε) | (5 / 2−) | α = 85, ε = 15 | |
228 Pa | 22 h | 2.148 (εβ + ), 6.265 (α) | 3+ | εβ + = 98.0, α = 2.0 | |
229 Pa | 1.50 d | 0.316 (ε), 5.841 (α) | (5/2 +) | ε ≈ 100, α = 0.48 | |
230 Pa | 17.4 d | 1.310 (εβ + ), 0.563 (β - ), 5.439 (α) | (2−) | εβ + = 91.6, β - = 8.4, α = 0.0032 | |
231 Pa | 32760 a | 5.149 (α), 51.843 ( 23 F), 60.41 ( 24 Ne) | 3 / 2− | α ≈ 100, SF <1.6 · 10 −11 , 23 F = 1 · 10 −12 , 24 Ne = 6 · 10 −10 | |
232 Pa | 1.31 d | 1.337 (β - ), 0.495 (ε) | (2−) | β - ≈ 100, ε = 0.003 | |
233 Pa | 26,967 d | 0.571 | 3 / 2− | β - | |
234 Pa | 6.70 h | 2.197 | 4+ | β - ≈ 100, SF <3 · 10 −10 | |
234m1 Pa | 1.17 min | 2.271 (β - ), 0.074 (ε) | (0−) | β - ≈ 100, IT = 0.16, SF <1 · 10 −9 | |
235 Pa | 24.5 min | 1.41 | (3 / 2−) | β - | |
236 Pa | 9.1 min | 2.9 | 1 (-) | β - | |
237 Pa | 8.7 min | 2.25 | (1/2 +) | β - | |
238 Pa | 2.3 min | 3.46 (β - ) | (3−) | β - ≈ 100, SF <2.6 · 10 −6 |
92 uranium
isotope | Half-life | Decay energy (MeV) |
Spin / parity |
Type (s) of decay (%) |
NH (%) |
Mass (u) |
---|---|---|---|---|---|---|
218 U | 1.5 ms | 8.79 | 0+ | α | ||
219 U | 42 µs | 9.9 | α =? | |||
220 U | 0+ | |||||
221 U | ||||||
222 U | 1.0 µs | 9.5 | 0+ | α | ||
223 U | 18 µs | 8.94 | α =? | |||
224 U | 0.9 ms | 8.62 | 0+ | α | ||
225 U | 95 ms | 8.02 | α | |||
226 U | 0.35 s | 7.715 | 0+ | α | ||
227 U | 1.1 min | 7.211 (α) | (3/2 +) | α ≈ 100, εβ + <0.001 | ||
228 U | 9.1 min | 6.804 (α), 0.307 (ε) | 0+ | α> 95, ε <5 | ||
229 U | 58 min | 1.309 (εβ + ), 6.475 (α) | (3/2 +) | εβ + ≈ 80, α ≈ 20 | ||
230 U | 20.8 d | 5.993 (α), 61.387 ( 22 Ne) | 0+ | α ≈ 100, SF <1.4 · 10 −10 , 22 Ne = 5 · 10 −11 | ||
231 U | 4.2 d | 0.36 (ε), 5.55 (α) | (5 / 2−) | ε ≈ 100, α ≈ 0.0055 | ||
232 U | 68.9 a | 5.414 (α), 62.309 ( 24 Ne), 74.318 ( 28 Mg) | 0+ | α ≈ 100, 24 Ne = 1.89 10 −10 , 28 Mg = 1.2 10 −11 | ||
233 U | 1.592 x 10 5 a | 4.909 (α), 60.485 ( 24 Ne), 60.776 ( 25 Ne), 74.225 ( 28 Mg) | 5/2 + | α ≈ 100, SF <6 10 -11 , 24 Ne = 7.4 10 -11 , 25 Ne = 7.2 10 -11 , 28 Mg = 1.3 10 -13 | ||
234 U | 2.455 · 10 5 a | 4.859 (α), 58.825 ( 24 Ne), 59.464 ( 26 Ne), 74.11 ( 28 Mg) | 0+ | α ≈ 100, SF = 1.64 10 −9 , 24 Ne = 9 10 −12 ?, 26 Ne = 9 10 −12 ?, 28 Mg = 2.2 10 −13 | 0.0055 | |
235 U | 7.038 x 10 8 a | 4,679 (α), 57,362 ( 24 Ne), 57,756 ( 25 Ne), 72,158 ( 28 Mg), 72,485 ( 29 Mg) | 7 / 2− | α ≈ 100, SF = 7.0 · 10 −9 , 24 Ne = 8 · 10 −10 ?, 25 Ne = 8 x 10 −10 ?, 28 Mg = 1.8 · 10 −10 ?, 29 Mg = 1 , 8 · 10 −10 ? | 0.7200 | |
235m1 U | 25 min | 0 ??? | 1/2 + | IT | ||
236 U | 2.342 · 10 7 a | 4,572 (α), 55,944 ( 24 Ne), 56,744 ( 26 Ne), 70,564 ( 28 Mg), 72,303 ( 30 Mg) | 0+ | α ≈ 100, SF = 9.4 10 −8 , 24 Ne = 9 10 −10 ?, 26 Ne = 9 10 −10 ?, 28 Mg = 2 10 −11 ?, 30 Mg = 2 10 −11 ? | ||
237 U | 6.75 d | 0.519 | 1/2 + | β - | ||
238 U | 4.468 · 10 9 a | 4.270 (α) | 0+ | α ≈ 100, SF = 5.45 · 10 −5 , 2β = 2.2 · 10 −10 | 99.2745 | |
238m1 U | 225 ns | 0+ | ||||
238m2 U | 1 ns | |||||
239 U | 23.45 min | 1.265 | 5/2 + | β - | ||
240 U | 14.1 h | 0.338 | 0+ | β - | ||
241 U | ||||||
242 U | 16.8 min | 0+ | β - |
93 neptunium
isotope | Half-life | Decay energy (MeV) |
Spin / parity |
Type (s) of decay (%) |
Mass (u) |
---|---|---|---|---|---|
225 Np | 6 ms | α =? | |||
226 Np | 35 ms | 8.2 | α | ||
227 Np | 0.51 s | 7.816 (α) | α ≈ 100, εβ + ≈ 0.05 | ||
228 Np | 61.4 s | 4.48 (ε), 7.42 (α) | ε = 60, α = 40, εSF = 0.020 | ||
229 Np | 4.0 min | 7.01 (α), 2.56 (ε) | α> 50, ε <50 | ||
230 Np | 4.6 min | 3.61 (εβ + ), 6.78 (α) | εβ + <97, α> 3 | ||
231 Np | 48.8 min | 1.84 (ε), 6.37 (α) | (5/2) | ε = 98, α = 2 | |
232 Np | 14.7 min | 2.70 | (4+) | εβ + | |
233 Np | 36.2 min | 1.23 (ε), 5.83 (α) | (5/2 +) | ε = 100, α <0.001 | |
234 Np | 4.4 d | 1.81 | (0+) | εβ + | |
235 Np | 396.1 d | 0.124 (ε), 5.192 (α) | 5/2 + | ε ≈ 100, α = 0.00260 | |
236 Np | 1.54 · 10 5 a | 0.94 (ε), 0.49 (β - ), 5.02 (α) | (6−) | ε = 87.3, β - = 12.5, α = 0.16 | |
236m1 Np | 22.5 h | 1.00 (ε), 0.55 (β - ) | 1 | ε = 52, β - = 48 | |
237 Np | 2.144 x 10 6 a | 4.959 (α), 74.818 ( 30 mg) | 5/2 + | α ≈ 100, SF <2 · 10 −10 , 30 Mg = 8 · 10 −12 | |
237m1 Np | 45 ns | α ≈ 100, SF =? | |||
238 Np | 2.117 d | 1.292 | 2+ | β - | |
238m1 Np | 112 ns | ||||
239 Np | 2.3565 d | 0.722 | 5/2 + | β - | |
240 Np | 61.9 min | 2.20 | (5+) | β - | |
240m1 Np | 7.22 min | 2.20 (β - ), 0 (IT) | 1 (+) | β - ≈ 100, IT = 0.11 | |
241 Np | 13.9 min | 1.31 | (5/2 +) | β - | |
242 Np | 5.5 min | 2.70 | (6) | β - | |
242m1 Np | 2.2 min | 2.70 | (1+) | β - | |
243 Np | 1.8 min | 2.17 | (5 / 2−) | β - | |
244 Np | 2.29 min | (7−) | β - |
94 plutonium
isotope | Half-life | Decay energy (MeV) |
Spin / parity |
Type (s) of decay (%) |
NH (%) |
Mass (u) |
---|---|---|---|---|---|---|
228 Pooh | 4 ms | 7.95 | 0+ | α | ||
229 Pu | 90 s | α | ||||
230 pu | 1.7 min | 7.175 (α) | 0+ | α <100, εβ + > 0 | ||
231 Pu | 8.6 min | εβ + =?, α =? | ||||
232 Pu | 34.1 min | 1.06 (εβ + ), 6.716 (α) | 0+ | ε = 77, α = 23 | ||
233 Pu | 20.9 min | 1.90 (εβ + ), 6.42 (α) | εβ + ≈ 100, α = 0.12 | |||
234 Pu | 8.8 h | 0.388 (εβ + ), 6.31 (α) | 0+ | ε ≈ 94, α ≈ 6 | ||
234m1 pu | 3 ns | |||||
235 Pu | 25.3 min | 1.17 (εβ + ), 6.00 (α) | (5/2 +) | εβ + ≈ 100, α = 0.0027 | ||
235m1 pu | 25 ns | |||||
236 Pu | 2,858 a | 5.867 (α), 79.669 ( 28 mg) | 0+ | α ≈ 100, SF = 1.37 10 −7 , 28 Mg = 8 10 −12 | ||
236m1 pu | 37 · 10 −12 s | (0+) | ||||
236m2 pu | 34 ns | |||||
237 Pu | 45.2 d | 0.22 (ε), 5.75 (α) | 7 / 2− | ε ≈ 100, α = 0.0042 | ||
237m1 pu | 0.18 s | 0.146 (IT) | 1/2 + | IT | ||
237m2 Pu | 85 ns | SF ≤ 100 | ||||
237m3 Pu | 1.1 µs | SF ≤ 100 | ||||
238 Pu | 87.74 a | 5.593 (α), 75.911 ( 28 Mg), 76.823 ( 30 Mg), 76.823 ( 32 Si) | 0+ | α ≈ 100, SF = 1.85 · 10 −7 , 28 Mg ≈ 6 · 10 −15 ?, 30 Mg ≈ 6 · 10 −15 ?, 32 Si ≈ 1.4 · 10 −14 | ||
238m1 pu | 0.6 ns | SF ≤ 100 | ||||
238m2 Pu | 6.0 ns | (0+) | SF ≤ 100 | |||
239 Pu | 24110 a | 5.245 (α) | 1/2 + | α ≈ 100, SF = 3.0 · 10 −10 | ||
239m1 pu | 7.5 µs | (5/2 +) | ||||
239m2 Pu | 2.6 ns | (9 / 2−) | ||||
240 pu | 6563 a | 5.256 (α), 91.191 ( 34 Si) | 0+ | α ≈ 100, SF = 5.75 · 10 −6 , 34 Si = 1.1 · 10 −12 | ||
240m1 pu | 3.7 ns | 0+ | SF> 0 | |||
241 Pu | 14.35 a | 0.021 (β - ), 5.140 (α) | 5/2 + | β - ≈ 100, α = 0.0025, SF ≈ 2.4 · 10 −14 | ||
241m1 pu | 21 µs | SF> 0 | ||||
241m2 pu | 32 ns | |||||
242 Pu | 3.733 x 10 5 a | 4.984 (α) | 0+ | α ≈ 100, SF = 5.54 · 10 −4 | ||
243 Pu | 4.956 h | 0.528 | 7/2 + | β - | ||
243m1 pu | 45 ns | |||||
244 Pu | 8.00 · 10 7 a | 4.666 (α) | 0+ | α = 99.879, SF = 0.121, 2β <3 · 10 −11 | 100 | |
244m1 pu | 400 ps | 0+ | SF ≤ 100 | |||
245 Pu | 10.5 h | 1.205 | (9 / 2−) | β - | ||
245m1 pu | 90 ns | |||||
246 Pu | 10.84 d | 0.401 | 0+ | β - | ||
247 Pu | 2.27 d | β - |
95 americium
isotope | Half-life | Decay energy (MeV) |
Spin / parity |
Type (s) of decay (%) |
Mass (u) |
---|---|---|---|---|---|
232 Am | 79 p | ? (ε), 7.2 (α) | ε ≈ 98, α ≈ 2, εSF = 0.069 | ||
233 On | 4.17 (εβ + ), 6.87 (α) | εβ + ≈ 100, α = 0.04 | |||
234 On | 2.32 min | ε ≈ 100, α = 0.039, εSF = 0.0066 | |||
235 On | 15 minutes | εβ + =?, α =? | |||
236 On | 3.28 (ε), 6.45 (α) | ε =?, α =? | |||
237 On | 73.0 min | 1.73 (ε), 6.25 (α) | 5/2 (-) | ε ≈ 100, α = 0.025 | |
237m1 at | 5 ns | SF =? | |||
238 On | 98 min | 2.26 (εβ + ), 6.04 (α) | 1+ | εβ + ≈ 100, α = 1.0 · 10 −4 | |
238m1 at | 35 µs | ||||
239 On | 11.9 h | 0.803 (ε), 5.924 (α) | (5/2) - | ε ≈ 100, α = 0.010 | |
239m1 at | 163 ns | (7/2 +) | |||
240 am | 50.8 h | 1.379 (ε), 5.710 (α) | (3−) | ε = 100, α = 1.9 · 10 −4 | |
240m1 at | 0.924 ms | SF =? | |||
241 On | 432.2 a | 5.638 (α), 93.927 ( 34 Si) | 5 / 2− | α ≈ 100, SF = 4.3 10 −10 , 34 Si = 5 10 −13 | |
241m1 at | 1.2 µs | ||||
242 On | 16.02 h | 0.665 (β - ), 0.751 (ε) | 1− | β - = 82.7, ε = 17.3 | |
242m1 at | 141 a | 0.049 (β - ), 5.637 (α) | 5− | IT ≈ 100, α = 0.459, SF <4.7 · 10 −9 | |
242m2 Am | 14.0 ms | 2.20 (β - ), 7.788 (α) | SF =?, IT =? | ||
243 On | 7370 a | 5.438 (α) | 5 / 2− | α ≈ 100, SF = 3.7 · 10 −9 | |
243m1 at | 5.5 µs | ||||
244 On | 10.1 h | 1.428 (β - ) | (6−) | β - | |
244m1 at | 6.5 µs | SF =? | |||
244m2 Am | 26 min | 1.516 (β - ), 0.164 (ε) | 1+ | β - ≈ 100, ε = 0.0361 | |
245 On | 2.05 h | 0.894 | (5/2) + | β - | |
245m1 at | 0.64 µs | ||||
246 On | 39 min | 2.376 | (7−) | β - | |
246m1 at | 25.0 min | 2.376 (β - ), 0 (IT) | 2 (-) | β - ≈ 100, IT <0.01 | |
246m2 Am | 73 µs | ||||
247 On | 23.0 min | 1.7 | (5/2) | β - | |
248 On | 3.1 | (5/2) | β - |
96 curium
isotope | Half-life | Decay energy (MeV) |
Spin / parity |
Type (s) of decay (%) |
Mass (u) |
---|---|---|---|---|---|
233 cm | 1 min | 3/2 + | |||
234 cm | 51 s | 0+ | β + = 47, SF = 3 | ||
235 cm | 5 min | 5/2 + | |||
235P Cm | |||||
236 cm | 10 min | 1.71 (εβ + ), 7.1 (α) | 0+ | εβ + =?, α =? | |
237 cm | 20 min | 5/2 + | α =? | ||
237P Cm | 7 / 2− | ||||
238 cm | 2.4 h | 0.97 (ε), 6.62 (α) | 0+ | ε = 96.16, α = 3.84 | |
239 cm | 2.9 h | 1.7 (ε), 6.46 (α) | (7 / 2−) | ε ≈ 100, α <0.1 | |
240 cm | 27 d | 6.397 (α), 0.215 (ε) | 0+ | α ≈ 100, ε <0.5, SF = 3.9 · 10 −6 | |
240m1 Cm | 10 ps | SF ≤ 100 | |||
240m2 Cm | 55 ns | SF ≈ 100 | |||
241 cm | 32.8 d | 0.767 (ε), 6.185 (α) | 1/2 + | ε ≈ 100, α = 1.0 | |
241m1 Cm | 15.3 ns | ||||
242 cm | 162.8 d | 6.216 (α), 96.51 ( 34 Si) | 0+ | α ≈ 100, SF = 6.37 · 10 −6 , 34 Si = 1 · 10 −14 | |
242m1 Cm | 40 · 10 −12 s | ||||
242m2 Cm | 0.18 µs | 2.80 (IT) | IT =?, SF =? | ||
243 cm | 29.1 a | 6.196 (α), 0.009 (ε) | 5/2 + | α ≈ 100, ε = 0.29, SF = 5.3 · 10 −9 | |
243m1 Cm | 42 ns | ||||
244 cm | 18.10 a | 5.902 (α) | 0+ | α ≈ 100, SF = 1.371 · 10 −4 | |
244m1 Cm | 34 ms | 1.04 (IT) | 6+ | IT = 100, SF <7.7 · 10 −10 | |
245 cm | 8500 a | 5.623 (α) | 7/2 + | α ≈ 100, SF = 6.1 · 10 −7 | |
245m1 Cm | 13.2 ns | ||||
246 cm | 4730 a | 5.475 (α) | 0+ | α ≈ 100, SF = 0.0263 | |
247 cm | 1.56 · 10 7 a | 5.353 | 9 / 2− | α | |
248 cm | 3.40 x 10 5 a | 5.162 (α) | 0+ | α = 91.61, SF = 8.39 | |
249 cm | 64.15 min | 1/2 (+) | β - | ||
250 cm | 9000 a | 5.169 (α), 0.90 (β - ) | 0+ | SF ≈ 86, α ≈ 8, β - ≈ 6 | |
251 cm | 16.8 min | 1.42 | (1/2 +) | β - | |
252 cm | 2 d | 0+ | β - |
97 Berkelium
isotope | Half-life | Decay energy (MeV) |
Spin / parity |
Type (s) of decay (%) |
Mass (u) |
---|---|---|---|---|---|
238 Bk | 144 s | 5.0 (εβ + ) | εβ + ≈ 100, εSF = 0.048 | ||
239 Bk | (7/2 +) | ||||
240 Bk | 4.8 min | 3.94 (εβ + ) | εβ + ≈ 100, εSF = 1 · 10 −3 | ||
241 Bk | (7/2 +) | ||||
242 Bk | 7.0 min | 3.0 (εβ + ) | εβ + ≈ 100, SF> 0 | ||
242m1 Bk | 9.5 ns | ||||
242m2 Bk | 0.60 µs | ||||
243 Bk | 4.5 h | 1.508 (ε), 6.874 (α) | (3 / 2−) | ε ≈ 100, α ≈ 0.15 | |
243m1 Bk | 5 ns | ||||
244 Bk | 4.35 h | 2.26 (ε), 6.78 (α) | (1−) | ε ≈ 100, α = 0.006 | |
244m1 Bk | 820 ns | SF ≤ 100 | |||
245 Bk | 4.94 d | 0.81 (ε), 6.455 (α) | 3 / 2− | ε ≈ 100, α = 0.12 | |
245m1 Bk | 2 ns | ||||
246 Bk | 1.80 d | 1.35 (ε), 6.07 (α) | 2 (-) | ε = 100, α <0.2 | |
247 Bk | 1380 a | 5.889 | (3 / 2−) | α <100 | |
248 Bk | 9 a | 5.803 | (6+) | α> 70 | |
248m1 Bk | 23.7 h | 0.87 (β - ), 0.717 (ε), 5.803 (α) | 1 (-) | β - = 70, ε = 30, α <0.001 | |
249 Bk | 320 d | 0.125 (β - ), 5.526 (α) | 7/2 + | β - ≈ 100, α = 0.00145, SF = 4.76 · 10 −8 | |
250 Bk | 3.217 h | 1.78 | 2− | β - | |
251 Bk | 55.6 min | 1.093 (β - ), 5.57 (α) | (3 / 2−) | β - ≈ 100, α ≈ 1 · 10 −5 |
98 californium
isotope | Half-life | Decay energy (MeV) |
Spin / parity |
Type (s) of decay (%) |
Mass (u) |
---|---|---|---|---|---|
237 Cf | 2.1 s | SF ≈ 10 | |||
238 Cf | 21 ms | 0+ | SF ≈ 100 | ||
239 Cf | 39 s | 7.81 (α), 3.9 (ε) | α> 50, ε <50 | ||
240 cf | 1.06 min | 7.719 (α) | 0+ | α ≈ 87, SF ≈ 13 | |
241 Cf | 3.78 min | 3.3 (ε), 7.66 (α) | ε ≈ 75, α ≈ 25 | ||
242 Cf | 3.49 min | 7.516 (α) | 0+ | α = 65, SF <1.4 · 10 −2 | |
243 Cf | 10.7 min | 2.22 (ε), 7.39 (α) | (1/2 +) | ε ≈ 86, α ≈ 14 | |
244 Cf | 19.4 min | 7.329 | 0+ | α = 70 | |
245 Cf | 45.0 min | 1.569 (ε), 7.256 (α) | (5/2 +) | ε = 64, α = 36 | |
246 Cf | 35.7 h | 6.862 (α), 0.12 (ε) | 0+ | α ≈ 100, SF = 2.3 · 10 −4 , ε <5 · 10 −4 | |
246m1 Cf | 45 ns | ||||
247 Cf | 3.11 h | 0.646 (ε), 6.527 (α) | (7/2 +) | ε ≈ 100, α = 0.035 | |
248 Cf | 333.5 d | 6.361 (α) | 0+ | α ≈ 100, SF = 0.0029 | |
249 Cf | 351 a | 6.295 (α) | 9 / 2− | α ≈ 100, SF = 4.4 · 10 −7 | |
250 cf | 13.08 a | 6.176 (α) | 0+ | α ≈ 100, SF = 0.077 | |
251 Cf | 898 a | 6.176 (α) | 1/2 + | α | |
252 Cf | 2,645 a | 6.217 (α) | 0+ | α = 96.908, SF = 3.092 | |
253 Cf | 17.81 d | 0.285 (β - ), 6.124 (α) | (7/2 +) | β - = 99.69, α = 0.31 | |
254 Cf | 60.5 d | 5.926 (α) | 0+ | SF = 99.69, α = 0.31 | |
255 Cf | 85 min | 0.7 | (9/2 +) | β - | |
256 Cf | 12.3 min | 5.6 (α) | 0+ | SF = 100, β - <1, α ≈ 1 · 10 −6 |
99 Einsteinium
isotope | Half-life | Decay energy (MeV) |
Spin / parity |
Type (s) of decay (%) |
Mass (u) |
---|---|---|---|---|---|
241 it | 9 s | α | |||
242 It | 40 s | 5.6 (ε) | α ≈ 100, εSF = 1.4 | ||
243 It | 21 s | 4.0 (ε), 8.072 (α) | ε <70, α> 30 | ||
244 it | 37 p | 4.56 (ε), 7.95 (α) | ε = 96, α = 4, εSF = 0.01 | ||
245 It | 1.1 min | 3.05 (ε), 7.909 (α) | (3 / 2−) | ε = 60, α = 40 | |
246 it | 7.7 min | 3.88 (ε), 7.74 (α) | (4−, 6+) | ε = 90.1, α = 9.9, εSF = 0.003 | |
247 it | 4.55 min | 2.48 (ε), 7.49 (α) | (7/2 +) | ε ≈ 93, α ≈ 7 | |
248 it | 27 min | (2−, 0+) | ε ≈ 100, α ≈ 0.25, εSF = 3 · 10 −5 | ||
249 it | 102.2 min | 1.45 (ε), 6.94 (α) | 7/2 (+) | ε ≈ 100, α = 0.57 | |
250 it | 8.6 h | 2.10 (ε), 6.88 (α) | (6+) | ε> 97, α <3 | |
250m1 it | 2.22 h | 2.10 (ε), 6.88 (α) | 1 (-) | ε ≈ 100, α <1 | |
251 it | 33 h | 0.376 (ε), 6.597 (α) | (3 / 2−) | ε ≈ 100, α = 0.49 | |
252 it | 471.7 d | 6.76 (α), 1.26 (ε), 0.48 (β - ) | (5−) | α = 76, ε = 24, β - ≈ 0.01 | |
253 it | 20.47 d | 6.739 (α) | 7/2 + | α ≈ 100, SF = 8.9 · 10 −6 | |
254 it | 275.7 d | 6.628 (α), 0.654 (ε), 1.09 (β - ) | (7+) | α ≈ 100, ε <1 · 10 −4 , β - = 1.74 · 10 −6 , SF <3 · 10 −6 | |
254m1 it | 39.3 h | 1.168 (β - ), 0.078 (IT), 6.696 (α), 0.732 (ε) | 2+ | β - ≈ 100, α = 0.33, IT <3, ε = 0.078, SF <0.045 | |
255 It | 39.8 d | 0.288 (β - ), 6.436 (α) | (7/2 +) | β - = 92.0, α = 8.0, SF = 0.0045 | |
256 It | 25.4 min | 1.67 | (1+) | β - | |
256m1 it | 7.6 h | 1.67 (β - ) | (8+) | β - ≈ 100, SF = 0.002 | |
257 it | 7.8 d | SF =?, Β - =? |
100 fermium
isotope | Half-life | Decay energy (MeV) |
Spin / parity |
Type (s) of decay (%) |
Mass (u) |
---|---|---|---|---|---|
242 m | 0.8 ms | 0+ | SF | ||
243 m | 0.18 s | 8.69 (α) | α <100, SF <0.5, ε =? | ||
244 ft | 3.3 ms | 0+ | SF | ||
245 m | 4.2 s | 8.44 (α) | α ≈ 100, SF <0.11 | ||
246 ft | 1.1 s | 8.374 (α), 2.16 (ε) | 0+ | α = 92, SF = 7.3, ε <1 | |
247 m | 35 s | 8.19 (α) | α> 50, εβ + <50 | ||
247m1 Fm | 9.2 s | α <100 | |||
248 ft | 36 s | 8.002 (α), 1.6 (ε) | 0+ | α = 93, ε ≈ 7, SF = 0.10 | |
249 m | 2.6 min | 2.44 (ε), 7.81 (α) | (7/2 +) | ε ≈ 85, α ≈ 15 | |
250 m | 30 min | 7.557 (α), 0.8 (ε) | 0+ | α> 90, ε <10, SF = 0.0069 | |
250m1 Fm | 1.8 s | 1.0 (IT) | IT> 80, SF <8 · 10 −5 | ||
251 ft | 5.30 h | 1.474 (ε), 7.425 (α) | (9 / 2−) | ε = 98.20, α = 1.80 | |
252 ft | 25.39 h | 7.153 (α) | 0+ | α ≈ 100, SF = 0.00232 | |
253 m | 3.00 d | 0.333 (ε), 7.197 (α) | 1/2 + | ε = 88, α = 12 | |
254 m | 3.240 h | 7.307 (α) | 0+ | α ≈ 100, SF = 0.0592 | |
255 ft | 20.07 h | 7.241 (α) | 7/2 + | α ≈ 100, SF = 2.3 · 10 −5 | |
256 ft | 157.6 min | 7.027 (α) | 0+ | SF = 91.9, α = 8.1 | |
256m1 Fm | 70 ns | IT> 80, SF =? | |||
257 m | 100.5 d | 6.864 (α) | (9/2 +) | α = 99.790, SF = 0.210 | |
258 ft | 370 µs | 0+ | SF | ||
259 m | 1.5 s | SF | |||
260 m | 4 ms | SF |
swell
See also list of isotopes # web links