Input interpretation
At-212 | daughter nuclides
Result
Bi-208 | Po-212 | Rn-212
Decay properties
| Bi-208 | Po-212 | Rn-212 half-life | 0.368 Myr (0.3635 to 0.3728 Myr) | 299 ns (296.5 to 301.5 ns) | 23.9 min (22.2 to 25.6 min) mean lifetime | 0.533 Myr (0.5252 to 0.5374 Myr) | 431 ns (428.1 to 434.6 ns) | 34.5 min (32 to 36.9 min) decay constant | 5.95×10^-14 per second | 2.32×10^6 per second | 4.83×10^-4 per second specific activity | 172 MBq/g | 6.59×10^15 TBq/g | 1.37×10^6 TBq/g width | 3.93×10^-29 eV | 1.53×10^-9 eV | 2.21×10^-19 eV decay modes | β^+ (positron emission) | α (alpha emission) | α (alpha emission) | 2β^+ (double beta decay) final decay products | Pb-208 (100%) | Pb-208 (100%) | Pb-204 (100%) | Pb-208 (0.00223%) | Hg-200 (0%)
Decay modes
decay mode | α (alpha emission) branching ratio | 100% Q-value | 7.82392 MeV (megaelectronvolts) daughter nuclide | Bi-208 decay mode | β^+ (positron emission) branching ratio | 0.03% Q-value | 726.03 keV (kiloelectronvolts) daughter nuclide | Po-212 decay mode | β^- (electron emission) branching ratio | 2×10^-6% Q-value | 38.42 keV (kiloelectronvolts) daughter nuclide | Rn-212
Bi-208
decay mode | β^+ (positron emission) branching ratio | 100% Q-value | 1.85623 MeV (megaelectronvolts) daughter nuclide | Pb-208
Po-212
decay mode | α (alpha emission) branching ratio | 100% Q-value | 8.95412 MeV (megaelectronvolts) daughter nuclide | Pb-208
Rn-212
decay mode | α (alpha emission) branching ratio | 100% Q-value | 6.38499 MeV (megaelectronvolts) daughter nuclide | Po-208 decay mode | 2β^+ (double beta decay) Q-value | -334.59 keV (kiloelectronvolts) daughter nuclide | Po-212
Radiation shielding
| Bi-208 | Po-212 lead | 32.6 µm | 20.6 µm water | 94.2 µm | 54.7 µm air | 85.7 mm | 49.9 mm
Decay chain
Bi-208
Decay chain Bi-208
Po-212
Decay chain Po-212
Rn-212
Decay chain Rn-212
Mass properties
| atomic number (Z) | mass number (A) | neutron number Bi-208 | 83 | 208 | 125 Po-212 | 84 | 212 | 128 Rn-212 | 86 | 212 | 126 | atomic mass | mass excess | binding energy per nucleon Bi-208 | 207.979742196 u (unified atomic mass units) | -18.870022 MeV (megaelectronvolts) | 7.849852 MeV (megaelectronvolts) Po-212 | 211.988867969 u (unified atomic mass units) | -10.36942 MeV (megaelectronvolts) | 7.810243 MeV (megaelectronvolts) Rn-212 | 211.990703529 u (unified atomic mass units) | -8.659606 MeV (megaelectronvolts) | 7.794797 MeV (megaelectronvolts)
Mass properties