Input interpretation
Ac-226 (actinium-226)
Decay properties
half-life | 29.36 hours (29.21 to 29.4919 h) mean lifetime | 42.36 hours (42.197 to 42.5475 h) decay constant | 6.557×10^-6 per second specific activity | 17470 TBq/g (terabecquerels per gram) width | 4.315×10^-21 eV (electronvolts) decay modes | β^- (electron emission) | ϵ (electron capture) | α (alpha emission) final decay products | Pb-206 (100%) | Tl-205 (3×10^-9) | Pb-208 (2.5×10^-10)
Decay modes
decay mode | β^- (electron emission) branching ratio | 83% Q-value | 1.11315 MeV (megaelectronvolts) daughter nuclide | Th-226 decay mode | ϵ (electron capture) branching ratio | 17% Q-value | 641.11 keV (kiloelectronvolts) daughter nuclide | Ra-226 decay mode | α (alpha emission) branching ratio | 6×10^-5 Q-value | 5.536 MeV (megaelectronvolts) daughter nuclide | Fr-222
Decay chain
Decay chain
Mass properties
atomic number (Z) | 89 mass number (A) | 226 neutron number | 137 atomic mass | 226.026098089 u (unified atomic mass units) mass excess | 24.310214 MeV (megaelectronvolts) binding energy per nucleon | 7.655658 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 1^- (atomic fermion)
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 5.1 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 18.8 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 33.3 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 45 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 58.3 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 70.3 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 77.7 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 130.4 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 165 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 195 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown)