Input interpretation
Ac-227 | daughter nuclides
Result
Th-227 | Fr-223
Decay properties
| Th-227 | Fr-223 half-life | 18.68 days (18.586 to 18.774 days) | 22 min (21.8 to 22.2 min) mean lifetime | 26.94 days (26.817 to 27.081 days) | 32 min (31.48 to 32.02 min) decay constant | 4.296×10^-7 per second | 5.3×10^-4 per second specific activity | 1139 TBq/g | 1.4×10^6 TBq/g width | 2.827×10^-22 eV | 3.5×10^-19 eV decay modes | α (alpha emission) | β^- (electron emission) | α (alpha emission) final decay products | Pb-207 (100%) | Tl-205 (9×10^-10) | Pb-207 (100%) | Tl-205 (9×10^-10)
Decay modes
decay mode | β^- (electron emission) branching ratio | 98.62% Q-value | 44.765 keV (kiloelectronvolts) daughter nuclide | Th-227 decay mode | α (alpha emission) branching ratio | 1.38% Q-value | 5.04219 MeV (megaelectronvolts) daughter nuclide | Fr-223
Th-227
decay mode | α (alpha emission) branching ratio | 100% Q-value | 6.1466 MeV (megaelectronvolts) daughter nuclide | Ra-223
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 | 6×10^-5 Q-value | 5.56187 MeV (megaelectronvolts) daughter nuclide | At-219
Radiation shielding
| Th-227 | Fr-223 lead | 19.6 µm | 808 µm portland concrete | | 2.66 mm water | 51.6 µm | 5.17 mm air | 47 mm | 4.55 m
Decay chain
Th-227
Decay chain Th-227
Fr-223
Decay chain Fr-223
Mass properties
| Th-227 | Fr-223 atomic number (Z) | 90 | 87 mass number (A) | 227 | 223 neutron number | 137 | 136 atomic mass | 227.02770407 u (unified atomic mass units) | 223.019735857 u (unified atomic mass units) mass excess | 25.806176 MeV (megaelectronvolts) | 18.383833 MeV (megaelectronvolts) binding energy per nucleon | 7.647452 MeV (megaelectronvolts) | 7.683658 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Th-227 | Fr-223 spin parity J^π | 1/2^+ (atomic fermion) | 3/2^- (atomic boson) magnetic moment | (unknown) | 1.17 μ_N electric quadrupole moment | (unknown) | 1.17 eb (electron barns)
Quantum properties