Input interpretation
Ac-224 (actinium-224)
Decay properties
half-life | 170 minutes (156.4 to 177.02 min) mean lifetime | 4 hours (3.7636 to 4.2586 h) decay constant | 6.94×10^-5 per second specific activity | 187000 TBq/g (terabecquerels per gram) width | 4.56×10^-20 eV (electronvolts) decay modes | β^+ (positron emission) | α (alpha emission) | β^- (electron emission) final decay products | Pb-208 (100%) | Pb-206 (3.6×10^-11)
Decay modes
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
Decay chain
Decay chain
Mass properties
atomic number (Z) | 89 mass number (A) | 224 neutron number | 135 atomic mass | 224.021722866 u (unified atomic mass units) mass excess | 20.23472 MeV (megaelectronvolts) binding energy per nucleon | 7.67014 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 0^- (atomic fermion) magnetic moment | 0 μ_N
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 17.6 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 23.3 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 29.8 keV (kiloelectronvolts) | 1^+ | (unknown) | (unknown) 37.2 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 45.7 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 47.3 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 49.1 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 52.2 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 64.4 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 78.5 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown)