Input interpretation
Pb-181 (lead-181) | Os-173 (osmium-173)
Decay properties
| Pb-181 | Os-173 half-life | 45 ms (21 to 73 ms) | 22.4 s (21.47 to 23.33 s) mean lifetime | 65 ms (35.1 to 95.1 ms) | 32.3 s (31 to 33.63 s) decay constant | 15 per second | 0.031 per second specific activity | 5.1×10^10 TBq/g | 1.08×10^8 TBq/g width | 1×10^-14 eV | 2.04×10^-17 eV decay modes | α (alpha emission) | β^+ (positron emission) | β^+ (positron emission) | α (alpha 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%) | Yb-173 (100%) | Tm-169 (0.4%)
Decay modes
Pb-181
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
Os-173
decay mode | β^+ (positron emission) branching ratio | 100% Q-value | 5.0934 MeV (megaelectronvolts) daughter nuclide | Re-173 decay mode | α (alpha emission) branching ratio | 0.4% Q-value | 5.05463 MeV (megaelectronvolts) daughter nuclide | W-169
Radiation shielding
Radiation shielding
Decay chain
Pb-181
Decay chain Pb-181
Os-173
Decay chain Os-173
Mass properties
| Pb-181 | Os-173 atomic number (Z) | 82 | 76 mass number (A) | 181 | 173 neutron number | 99 | 97 atomic mass | 180.996623958 u (unified atomic mass units) | 172.959808409 u (unified atomic mass units) mass excess | -3.144762 MeV (megaelectronvolts) | -37.438225 MeV (megaelectronvolts) binding energy per nucleon | 7.734258 MeV (megaelectronvolts) | 7.944033 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Pb-181 | Os-173 spin parity J^π | 5/2^- (atomic fermion) | 5/2^- (atomic fermion)
Quantum properties