Input interpretation
Cf-255 (californium-255)
Decay properties
half-life | 85 minutes (58 to 110 min) mean lifetime | 120 minutes (96.1 to 149.2 min) decay constant | 1.4×10^-4 per second specific activity | 320000 TBq/g (terabecquerels per gram) width | 8.9×10^-20 eV (electronvolts) decay modes | β^- (electron emission) | SF (spontaneous fission) | α (alpha emission) final decay products | Pb-207 (100%) | Tl-205 (9×10^-8%) | Pb-206 (8×10^-10%) | Pb-208 (1×10^-12%)
Decay modes
decay mode | β^- (electron emission) branching ratio | 100% Q-value | 720 keV (kiloelectronvolts) daughter nuclide | Es-255 decay mode | SF (spontaneous fission) branching ratio | 0.001% decay mode | α (alpha emission) branching ratio | 2×10^-7% Q-value | 5.736 MeV (megaelectronvolts) daughter nuclide | Cm-251
Radiation shielding
lead | 470 µm portland concrete | 1.49 mm water | 2.88 mm air | 255 cm
Decay chain
Decay chain
Mass properties
atomic number (Z) | 98 mass number (A) | 255 neutron number | 157 atomic mass | 255.091046 u (unified atomic mass units) mass excess | 84.809 MeV (megaelectronvolts) binding energy per nucleon | 7.438 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 7/2^+ (atomic fermion)
Quantum properties