Input interpretation
Bk-247 (berkelium-247) | Fr-223 (francium-223)
Decay properties
| Bk-247 | Fr-223 half-life | 1380 yr (1110 to 1650 yr) | 22 min (21.8 to 22.2 min) mean lifetime | 1990 yr (1629 to 2355 yr) | 32 min (31.48 to 32.02 min) decay constant | 1.59×10^-11 per second | 5.3×10^-4 per second specific activity | 38.8 GBq/g | 1.4×10^6 TBq/g width | 1.05×10^-26 eV | 3.5×10^-19 eV decay modes | α (alpha emission) | SF (spontaneous fission) | β^- (electron emission) | α (alpha emission) final decay products | Pb-207 (100%) | Tl-205 (9×10^-8%) | Pb-206 (8×10^-10%) | Pb-208 (1×10^-12%) | Pb-207 (100%) | Tl-205 (9×10^-8%)
Decay modes
Bk-247
decay mode | α (alpha emission) branching ratio | 100% Q-value | 5.8896 MeV (megaelectronvolts) daughter nuclide | Am-243 decay mode | SF (spontaneous fission)
Fr-223
decay mode | β^- (electron emission) branching ratio | 100% Q-value | 1.149171 MeV (megaelectronvolts) daughter nuclide | Ra-223 decay mode | α (alpha emission) branching ratio | 0.006% Q-value | 5.56187 MeV (megaelectronvolts) daughter nuclide | At-219
Radiation shielding
| Bk-247 | Fr-223 lead | 18.5 µm | 808 µm portland concrete | | 2.66 mm water | 48.3 µm | 5.17 mm air | 44 mm | 4.55 m
Decay chain
Bk-247
Decay chain Bk-247
Fr-223
Decay chain Fr-223
Mass properties
| Bk-247 | Fr-223 atomic number (Z) | 97 | 87 mass number (A) | 247 | 223 neutron number | 150 | 136 atomic mass | 247.07030708 u (unified atomic mass units) | 223.019735857 u (unified atomic mass units) mass excess | 65.490624 MeV (megaelectronvolts) | 18.383833 MeV (megaelectronvolts) binding energy per nucleon | 7.498936 MeV (megaelectronvolts) | 7.683658 MeV (megaelectronvolts)
Mass properties