Input interpretation
Am-242 (americium-242) | Gd-151 (gadolinium-151)
Decay properties
| Am-242 | Gd-151 half-life | 16.019 h (15.998 to 16.042 h) | 124 days (122.9 to 126 days) mean lifetime | 23.1 h (23.081 to 23.142 h) | 179 days (177.3 to 180.5 days) decay constant | 1.2×10^-5 per second | 6.45×10^-8 per second specific activity | 29900 TBq/g | 257 TBq/g width | 7.911×10^-21 eV | 4.26×10^-23 eV decay modes | β^- (electron emission) | ϵ (electron capture) | ϵ (electron capture) | α (alpha emission) final decay products | Pb-206 (100%) | Tl-205 (1.9×10^-6%) | Pb-208 (2.6×10^-9%) | W-184 (9×10^-12%) | Yb-168 (2×10^-15%) | Er-164 (2×10^-15%) | Dy-160 (6×10^-17%) | Dy-156 (4×10^-19%) | Sm-144 (4×10^-20%) | Ce-140 (4×10^-21%) | Dy-164 (0%) | Er-168 (0%) | Gd-156 (0%) | Hf-176 (0%) | Hf-180 (0%) | Sm-152 (0%) | Yb-172 (0%) | Eu-151 (100%) | Nd-143 (1×10^-6%)
Decay modes
Am-242
decay mode | β^- (electron emission) branching ratio | 82.7% Q-value | 664.467 keV (kiloelectronvolts) daughter nuclide | Cm-242 decay mode | ϵ (electron capture) branching ratio | 17.3% Q-value | 751.295 keV (kiloelectronvolts) daughter nuclide | Pu-242
Gd-151
decay mode | ϵ (electron capture) branching ratio | 100% Q-value | 464.18 keV (kiloelectronvolts) daughter nuclide | Eu-151 decay mode | α (alpha emission) branching ratio | 1×10^-6% Q-value | 2.65225 MeV (megaelectronvolts) daughter nuclide | Sm-147
Radiation shielding
Radiation shielding
Decay chain
Am-242
Decay chain Am-242
Gd-151
Decay chain Gd-151
Mass properties
| Am-242 | Gd-151 atomic number (Z) | 95 | 64 mass number (A) | 242 | 151 neutron number | 147 | 87 atomic mass | 242.059549159 u (unified atomic mass units) | 150.920348482 u (unified atomic mass units) mass excess | 55.469685 MeV (megaelectronvolts) | -74.194911 MeV (megaelectronvolts) binding energy per nucleon | 7.534984 MeV (megaelectronvolts) | 8.231084 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Am-242 | Gd-151 spin parity J^π | 1^- (atomic fermion) | 7/2^- (atomic fermion) magnetic moment | 0.3879 μ_N | 0.77 μ_N electric quadrupole moment | -2.4 eb (electron barns) | (unknown)
Quantum properties