Input interpretation
Ac-206 (actinium-206)
Decay properties
half-life | 22 ms (milliseconds) (10 to 40 ms) mean lifetime | 32 ms (milliseconds) (10 to 70 ms) decay constant | 32 per second specific activity | 9.2×10^10 TBq/g (terabecquerels per gram) width | 1.4×10^-14 eV (electronvolts) decay modes | α (alpha emission) | β^+ (positron emission) final decay products | Pt-194 (90%) | Hg-198 (1%) | W-182 (0.4%) | Hg-202 (0.4%) | Hf-178 (0) | Os-190 (0)
Decay modes
decay mode | α (alpha emission) branching ratio | 100% Q-value | 7.9446 MeV (megaelectronvolts) daughter nuclide | Fr-202 decay mode | β^+ (positron emission) branching ratio | 0.2% Q-value | 8.924 MeV (megaelectronvolts) daughter nuclide | Ra-206
Radiation shielding
lead | 27.6 µm water | 77.5 µm air | 70.6 mm
Decay chain
Decay chain
Mass properties
atomic number (Z) | 89 mass number (A) | 206 neutron number | 117 atomic mass | 206.01450498 u (unified atomic mass units) mass excess | 13.511303 MeV (megaelectronvolts) binding energy per nucleon | 7.667724 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 3^+ (atomic fermion) magnetic moment | 0 μ_N
Quantum properties