Input interpretation
Ac-211 (actinium-211) | La-134 (lanthanum-134)
Decay properties
| Ac-211 | La-134 half-life | 210 ms (160 to 260 ms) | 6.45 min (6.28 to 6.62 min) mean lifetime | 303 ms (210 to 400 ms) | 9.3 min (9.068 to 9.542 min) decay constant | 3.3 per second | 0.00179 per second specific activity | 9.42×10^9 TBq/g | 8.06×10^6 TBq/g width | 1.51×10^-15 eV | 1.18×10^-18 eV decay modes | α (alpha emission) | β^+ (positron emission) | β^+ (positron emission) final decay products | Tl-203 (70%) | Hg-199 (29%) | Pb-207 (3.8%) | Ba-134 (100%)
Decay modes
Ac-211
decay mode | α (alpha emission) branching ratio | 100% Q-value | 7.6216 MeV (megaelectronvolts) daughter nuclide | Fr-207 decay mode | β^+ (positron emission) branching ratio | 0.2% Q-value | 5.3463 MeV (megaelectronvolts) daughter nuclide | Ra-211
La-134
decay mode | β^+ (positron emission) branching ratio | 100% Q-value | 2.709 MeV (megaelectronvolts) daughter nuclide | Ba-134
Radiation shielding
| Ac-211 lead | 26.1 µm water | 72.5 µm air | 66 mm
Decay chain
Ac-211
Decay chain Ac-211
La-134
Decay chain La-134
Mass properties
| Ac-211 | La-134 atomic number (Z) | 89 | 57 mass number (A) | 211 | 134 neutron number | 122 | 77 atomic mass | 211.007734835 u (unified atomic mass units) | 133.908514011 u (unified atomic mass units) mass excess | 7.204953 MeV (megaelectronvolts) | -85.21865 MeV (megaelectronvolts) binding energy per nucleon | 7.707176 MeV (megaelectronvolts) | 8.374488 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Ac-211 | La-134 spin parity J^π | 9/2^- (atomic boson) | 1^+ (atomic fermion)
Quantum properties