Input interpretation
At-216 (astatine-216)
Decay properties
half-life | 300 µs (microseconds) (269.7 to 330.6 µs) mean lifetime | 433 µs (microseconds) (389.1 to 476.5 µs) decay constant | 2310 per second specific activity | 6.44×10^12 TBq/g (terabecquerels per gram) width | 1.52×10^-12 eV (electronvolts) decay modes | α (alpha emission) | β^- (electron emission) | ϵ (electron capture) final decay products | Pb-208 (100%)
Decay modes
decay mode | α (alpha emission) branching ratio | 100% Q-value | 7.94963 MeV (megaelectronvolts) daughter nuclide | Bi-212 decay mode | β^- (electron emission) branching ratio | 6×10^-5 Q-value | 2.00168 MeV (megaelectronvolts) daughter nuclide | Rn-216 decay mode | ϵ (electron capture) branching ratio | 3×10^-9 Q-value | 473.41 keV (kiloelectronvolts) daughter nuclide | Po-216
Radiation shielding
lead | 27.6 µm water | 77.6 µm air | 70.6 mm
Decay chain
Decay chain
Mass properties
atomic number (Z) | 85 mass number (A) | 216 neutron number | 131 atomic mass | 216.002423257 u (unified atomic mass units) mass excess | 2.25725 MeV (megaelectronvolts) binding energy per nucleon | 7.752999 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 44.59 keV (kiloelectronvolts) | 2^- | (unknown) | (unknown) 57.11 keV (kiloelectronvolts) | 4^- | (unknown) | (unknown) 105.89 keV (kiloelectronvolts) | 0^- | (unknown) | (unknown) 122 keV (kiloelectronvolts) | 5^- | (unknown) | (unknown) 153.4 keV (kiloelectronvolts) | 2^- | (unknown) | (unknown) 160.73 keV (kiloelectronvolts) | 1^- | (unknown) | (unknown) 169.3 keV (kiloelectronvolts) | 3^- | (unknown) | (unknown) 199.2 keV (kiloelectronvolts) | 3^- | (unknown) | (unknown) 208 keV (kiloelectronvolts) | 1^- or 2^- (uncertain) | (unknown) | (unknown) 234.6 keV (kiloelectronvolts) | 1^- or 2^- (uncertain) | (unknown) | (unknown)