Input interpretation
Pu-241 (plutonium-241)
Decay properties
half-life | 14.29 years (14.28 to 14.3 yr) mean lifetime | 20.616 years (20.59 to 20.64 yr) decay constant | 1.5381×10^-9 per second specific activity | 3.8425 TBq/g (terabecquerels per gram) width | 7.0168×10^-25 eV (electronvolts) decay modes | β^- (electron emission) | α (alpha emission) | SF (spontaneous fission) final decay products | Tl-205 (100%) | Pb-207 (7×10^-12)
Critical properties
critical mass | 12 kg (kilograms) critical diameter | 10.5 cm (centimeters) (for a uniform sphere)
Decay modes
decay mode | β^- (electron emission) branching ratio | 100% Q-value | 20.783 keV (kiloelectronvolts) daughter nuclide | Am-241 decay mode | α (alpha emission) branching ratio | 2.45×10^-5 Q-value | 5.14 MeV (megaelectronvolts) daughter nuclide | U-237 decay mode | SF (spontaneous fission) branching ratio | 2.4×10^-16
Radiation shielding
lead | 2.19 µm portland concrete | 4.97 µm water | 9.17 µm air | 8.21 mm
Decay chain
Decay chain
Mass properties
atomic number (Z) | 94 mass number (A) | 241 neutron number | 147 atomic mass | 241.056851456 u (unified atomic mass units) mass excess | 52.956791 MeV (megaelectronvolts) binding energy per nucleon | 7.546432 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 5/2^+ (atomic fermion) magnetic moment | -0.683 μ_N electric quadrupole moment | 5.6 eb (electron barns)
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 41.9722 keV (kiloelectronvolts) | 7/2^+ | (unknown) | (unknown) 95.7795 keV (kiloelectronvolts) | 9/2^+ | (unknown) | (unknown) 161.314 keV (kiloelectronvolts) | 11/2^+ | (unknown) | (unknown) 161.6852 keV (kiloelectronvolts) | 1/2^+ | 8.8×10^-7 seconds | 5.2×10^-10 eV (electronvolts) 170.9399 keV (kiloelectronvolts) | 3/2^+ | (unknown) | (unknown) 175.0523 keV (kiloelectronvolts) | 7/2^+ | (unknown) | (unknown) 222.9878 keV (kiloelectronvolts) | 5/2^+ | (unknown) | (unknown) 231.935 keV (kiloelectronvolts) | 9/2^+ | (unknown) | (unknown) 235 keV (kiloelectronvolts) | 13/2^+ | (unknown) | (unknown) 244.8896 keV (kiloelectronvolts) | 7/2^+ | (unknown) | (unknown)