Input interpretation
Ac-208 | daughter nuclides
Result
Fr-204 | Ra-208
Decay properties
| Fr-204 | Ra-208 half-life | 1.7 s (1.38 to 2.04 s) | 1.3 s (1.09 to 1.51 s) mean lifetime | 2.5 s (1.9 to 2.91 s) | 1.9 s (1.57 to 2.18 s) decay constant | 0.4 per second | 0.53 per second specific activity | 1.2×10^9 TBq/g | 1.5×10^9 TBq/g width | 2.7×10^-16 eV | 3.5×10^-16 eV decay modes | α (alpha emission) | β^+ (positron emission) | α (alpha emission) | β^+ (positron emission) final decay products | Hg-196 (60%) | Hg-200 (37%) | Pt-192 (6×10^-4%) | Os-188 (3×10^-11%) | Os-184 (7×10^-18%) | Hf-176 (0%) | Hf-180 (0%) | Pb-204 (0%) | Pt-196 (0%) | W-180 (0%) | W-184 (0%) | Hg-200 (60%) | Hg-196 (8%) | Pb-204 (5%) | Pb-208 (4×10^-6%) | Pt-192 (2×10^-6%) | Os-188 (9×10^-14%) | Os-184 (2×10^-20%) | Hf-176 (0%) | Hf-180 (0%) | Pt-196 (0%) | W-180 (0%) | W-184 (0%)
Decay modes
decay mode | α (alpha emission) branching ratio | 99% Q-value | 7.7268 MeV (megaelectronvolts) daughter nuclide | Fr-204 decay mode | β^+ (positron emission) branching ratio | 1% Q-value | 8.0241 MeV (megaelectronvolts) daughter nuclide | Ra-208
Fr-204
decay mode | α (alpha emission) branching ratio | 96% Q-value | 7.17128 MeV (megaelectronvolts) daughter nuclide | At-200 decay mode | β^+ (positron emission) Q-value | 7.5703 MeV (megaelectronvolts) daughter nuclide | Rn-204
Ra-208
decay mode | α (alpha emission) branching ratio | 95% Q-value | 7.27306 MeV (megaelectronvolts) daughter nuclide | Rn-204 decay mode | β^+ (positron emission) branching ratio | 5% Q-value | 3.3569 MeV (megaelectronvolts) daughter nuclide | Fr-208
Radiation shielding
Radiation shielding
Decay chain
Fr-204
Decay chain Fr-204
Ra-208
Decay chain Ra-208
Mass properties
| Fr-204 | Ra-208 atomic number (Z) | 87 | 88 mass number (A) | 204 | 208 neutron number | 117 | 120 atomic mass | 204.000653204 u (unified atomic mass units) | 208.00183994 u (unified atomic mass units) mass excess | 0.608456 MeV (megaelectronvolts) | 1.713894 MeV (megaelectronvolts) binding energy per nucleon | 7.734687 MeV (megaelectronvolts) | 7.732084 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Fr-204 | Ra-208 spin parity J^π | 3^+ (atomic fermion) | 0^+ (atomic boson) magnetic moment | (unknown) | 0 μ_N
Quantum properties