Input interpretation
Ac-224 (actinium-224) | Np-232 (neptunium-232)
Decay properties
| Ac-224 | Np-232 half-life | 170 min (156.4 to 177.02 min) | 14.7 min (14.3 to 17 min) mean lifetime | 4 h (3.7636 to 4.2586 h) | 21.17 min (20.76 to 21.67 min) decay constant | 6.94×10^-5 per second | 7.874×10^-4 per second specific activity | 187000 TBq/g | 2.044×10^6 TBq/g width | 4.56×10^-20 eV | 5.17×10^-19 eV decay modes | β^+ (positron emission) | α (alpha emission) | β^- (electron emission) | β^+ (positron emission) | α (alpha emission) final decay products | Pb-208 (100%) | Pb-206 (3.6×10^-9%) | Pb-208 (100%) | Pb-206 (4×10^-9%) | Hg-204 (5×10^-12%) | Pb-204 (0%) | Hg-200 (0%)
Decay modes
Ac-224
decay mode | β^+ (positron emission) branching ratio | 90.6% Q-value | 385.33 keV (kiloelectronvolts) daughter nuclide | Ra-224 decay mode | α (alpha emission) branching ratio | 9.4% Q-value | 6.3269 MeV (megaelectronvolts) daughter nuclide | Fr-220 decay mode | β^- (electron emission) branching ratio | 1.6% Q-value | 238.4 keV (kiloelectronvolts) daughter nuclide | Th-224
Np-232
decay mode | β^+ (positron emission) branching ratio | 100% Q-value | 1.728 MeV (megaelectronvolts) daughter nuclide | U-232 decay mode | α (alpha emission) branching ratio | 0.003% Q-value | 6.012 MeV (megaelectronvolts) daughter nuclide | Pa-228
Radiation shielding
Radiation shielding
Decay chain
Ac-224
Decay chain Ac-224
Np-232
Decay chain Np-232
Mass properties
| Ac-224 | Np-232 atomic number (Z) | 89 | 93 mass number (A) | 224 | 232 neutron number | 135 | 139 atomic mass | 224.021722866 u (unified atomic mass units) | 232.040108 u (unified atomic mass units) mass excess | 20.23472 MeV (megaelectronvolts) | 37.361 MeV (megaelectronvolts) binding energy per nucleon | 7.67014 MeV (megaelectronvolts) | 7.597 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Ac-224 | Np-232 spin parity J^π | 0^- (atomic fermion) | 4^+ (atomic fermion) magnetic moment | 0 μ_N | (unknown)
Quantum properties