Input interpretation
Mn-54 (manganese-54)
Decay properties
half-life | 312.12 days (311.97 to 312.27 days) mean lifetime | 450.29 days (450 to 450.6 days) decay constant | 2.5703×10^-8 per second specific activity | 286.96 TBq/g (terabecquerels per gram) width | 1.1726×10^-23 eV (electronvolts) decay modes | ϵ (electron capture) | β^- (electron emission) | e^+ (positron emission) final decay products | Cr-54 (100%) | Fe-54 (2.9×10^-6)
Radiation shielding
half-value layer | lead: 7.4 mm (millimeters) tenth-value layer | lead: 24.6 mm (millimeters)
Biological properties
biological half-life | 25 days biological lifetime | 36 days effective half-life | 23 days effective lifetime | 33 days external exposure advisory | external hazard critical organs | liver | gastrointestinal tract
Decay modes
decay mode | ϵ (electron capture) branching ratio | 100% Q-value | 1.37718 MeV (megaelectronvolts) daughter nuclide | Cr-54 decay mode | β^- (electron emission) branching ratio | 2.9×10^-6 Q-value | 697.09 keV (kiloelectronvolts) daughter nuclide | Fe-54 decay mode | e^+ (positron emission) branching ratio | 1.28×10^-9 daughter nuclide | Cr-54
Decay chain
Decay chain
Mass properties
atomic number (Z) | 25 mass number (A) | 54 neutron number | 29 atomic mass | 53.940358854 u (unified atomic mass units) mass excess | -55.55537 MeV (megaelectronvolts) binding energy per nucleon | 8.737923 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 3^+ (atomic fermion) magnetic moment | 3.2819 μ_N electric quadrupole moment | 0.33 eb (electron barns)
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 54.87 keV (kiloelectronvolts) | 2^+ | 4.9×10^-11 seconds | 9.3×10^-6 eV (electronvolts) 156.3 keV (kiloelectronvolts) | 4^+ | 1.86×10^-10 seconds | 2.45×10^-6 eV (electronvolts) 368.29 keV (kiloelectronvolts) | 5^+ | 6.9×10^-12 seconds | 6.6×10^-5 eV (electronvolts) 407.55 keV (kiloelectronvolts) | 3^+ | 1.8×10^-12 seconds | 2.5×10^-4 eV (electronvolts) 838.91 keV (kiloelectronvolts) | 4^+ | 4.1×10^-13 seconds | 0.0011 eV (electronvolts) 1009.62 keV (kiloelectronvolts) | 3^+ | 4.4×10^-14 seconds | 0.01 eV (electronvolts) 1073.3 keV (kiloelectronvolts) | 6^+ | 2.2×10^-10 seconds | 2.07×10^-6 eV (electronvolts) 1136.74 keV (kiloelectronvolts) | 5^+ | 6×10^-13 seconds | 7.6×10^-4 eV (electronvolts) 1374.99 keV (kiloelectronvolts) | 2^+ or 3^+ (uncertain) | 1.12×10^-14 seconds | 0.0407 eV (electronvolts) 1391 keV (kiloelectronvolts) | 1^+ | 3.8×10^-13 seconds | 0.0012 eV (electronvolts)