Input interpretation
At-216 (astatine-216) | At-203 (astatine-203)
Decay properties
| At-216 | At-203 half-life | 300 µs (269.7 to 330.6 µs) | 7.33 min (7.12 to 7.68 min) mean lifetime | 433 µs (389.1 to 476.5 µs) | 10.7 min (10.3 to 11.1 min) decay constant | 2310 per second | 0.00156 per second specific activity | 6.44×10^12 TBq/g | 4.64×10^6 TBq/g width | 1.52×10^-12 eV | 1×10^-18 eV decay modes | α (alpha emission) | β^- (electron emission) | ϵ (electron capture) | β^+ (positron emission) | α (alpha emission) final decay products | Pb-208 (100%) | Tl-203 (69%) | Hg-199 (31%)
Decay modes
At-216
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
At-203
decay mode | β^+ (positron emission) branching ratio | 69% Q-value | 4.1214 MeV (megaelectronvolts) daughter nuclide | Po-203 decay mode | α (alpha emission) branching ratio | 31% Q-value | 6.21005 MeV (megaelectronvolts) daughter nuclide | Bi-199
Radiation shielding
| At-216 lead | 27.6 µm water | 77.6 µm air | 70.6 mm
Decay chain
At-216
Decay chain At-216
At-203
Decay chain At-203
Mass properties
| At-216 | At-203 atomic number (Z) | 85 | 85 mass number (A) | 216 | 203 neutron number | 131 | 118 atomic mass | 216.002423257 u (unified atomic mass units) | 202.986941984 u (unified atomic mass units) mass excess | 2.25725 MeV (megaelectronvolts) | -12.163464 MeV (megaelectronvolts) binding energy per nucleon | 7.752999 MeV (megaelectronvolts) | 7.803652 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| At-216 | At-203 spin parity J^π | 1^- (atomic fermion) | 9/2^- (atomic boson)
Quantum properties