Input interpretation
Pb-181 (lead-181)
Decay properties
half-life | 45 ms (milliseconds) (21 to 73 ms) mean lifetime | 65 ms (milliseconds) (35.1 to 95.1 ms) decay constant | 15 per second specific activity | 5.1×10^10 TBq/g (terabecquerels per gram) width | 1×10^-14 eV (electronvolts) decay modes | α (alpha emission) | β^+ (positron emission) final decay products | Tm-169 (60%) | Yb-173 (26%) | Ho-165 (8%) | Dy-161 (0.02%) | Gd-157 (2×10^-5%) | Eu-153 (5×10^-8%) | Sm-149 (4×10^-8%) | Nd-145 (9×10^-9%) | Pr-141 (2×10^-17%) | Hf-176 (0%) | Hf-177 (0%) | Hf-180 (0%) | Ta-181 (0%) | W-180 (0%)
Decay modes
decay mode | α (alpha emission) branching ratio | 98% Q-value | 7.2112 MeV (megaelectronvolts) daughter nuclide | Hg-177 decay mode | β^+ (positron emission) branching ratio | 2% Q-value | 8.6341 MeV (megaelectronvolts) daughter nuclide | Tl-181
Decay chain
Decay chain
Mass properties
atomic number (Z) | 82 mass number (A) | 181 neutron number | 99 atomic mass | 180.996623958 u (unified atomic mass units) mass excess | -3.144762 MeV (megaelectronvolts) binding energy per nucleon | 7.734258 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 5/2^- (atomic fermion)
Quantum properties