Input interpretation
Ac-211 | daughter nuclides
Result
Fr-207 | Ra-211
Decay properties
| Fr-207 | Ra-211 half-life | 14.8 s (14.69 to 14.91 s) | 13 s (10.8 to 15.2 s) mean lifetime | 21.4 s (21.19 to 21.51 s) | 19 s (15.6 to 21.9 s) decay constant | 0.0467 per second | 0.053 per second specific activity | 1.36×10^8 TBq/g | 1.5×10^8 TBq/g width | 3.08×10^-17 eV | 3.5×10^-17 eV decay modes | α (alpha emission) | β^+ (positron emission) | α (alpha emission) | β^+ (positron emission) final decay products | Tl-203 (70%) | Hg-199 (30%) | Pb-207 (3.6%) | Pb-207 (70%) | Tl-203 (26%) | Hg-199 (0.02%)
Decay modes
decay mode | α (alpha emission) branching ratio | 100% Q-value | 7.6216 MeV (megaelectronvolts) daughter nuclide | Fr-207 decay mode | β^+ (positron emission) branching ratio | 0.2% Q-value | 5.3463 MeV (megaelectronvolts) daughter nuclide | Ra-211
Fr-207
decay mode | α (alpha emission) branching ratio | 95% Q-value | 6.897 MeV (megaelectronvolts) daughter nuclide | At-203 decay mode | β^+ (positron emission) branching ratio | 5% Q-value | 4.7672 MeV (megaelectronvolts) daughter nuclide | Rn-207
Ra-211
decay mode | α (alpha emission) branching ratio | 93% Q-value | 7.04257 MeV (megaelectronvolts) daughter nuclide | Rn-207 decay mode | β^+ (positron emission) branching ratio | 7% Q-value | 3.972 MeV (megaelectronvolts) daughter nuclide | Fr-211
Radiation shielding
Radiation shielding
Decay chain
Fr-207
Decay chain Fr-207
Ra-211
Decay chain Ra-211
Mass properties
| Fr-207 | Ra-211 atomic number (Z) | 87 | 88 mass number (A) | 207 | 211 neutron number | 120 | 123 atomic mass | 206.996949414 u (unified atomic mass units) | 211.000897987 u (unified atomic mass units) mass excess | -2.841602 MeV (megaelectronvolts) | 0.83647 MeV (megaelectronvolts) binding energy per nucleon | 7.756232 MeV (megaelectronvolts) | 7.741066 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Fr-207 | Ra-211 spin parity J^π | 9/2^- (atomic boson) | 5/2^- (atomic fermion) magnetic moment | 3.89 μ_N | 0.878 μ_N electric quadrupole moment | -0.16 eb (electron barns) | 0.46 eb (electron barns)
Quantum properties