Input interpretation
Fm-250 (fermium-250)
Decay properties
half-life | 30 minutes (26.97 to 33.03 min) mean lifetime | 43 minutes (38.82 to 47.87 min) decay constant | 3.8×10^-4 per second specific activity | 930000 TBq/g (terabecquerels per gram) width | 2.5×10^-19 eV (electronvolts) decay modes | α (alpha emission) | ϵ (electron capture) | SF (spontaneous fission) final decay products | Pb-206 (100%) | Tl-205 (2×10^-8) | Pb-208 (2.6×10^-11) | W-184 (9×10^-14) | Yb-168 (2×10^-17) | Er-164 (2×10^-17) | Dy-160 (7×10^-19) | Dy-156 (4×10^-21) | Sm-144 (4×10^-22) | Ce-140 (5×10^-23) | Dy-164 (0) | Er-168 (0) | Gd-156 (0) | Hf-176 (0) | Hf-180 (0) | Sm-152 (0) | Yb-172 (0)
Decay modes
decay mode | α (alpha emission) branching ratio | 90% Q-value | 7.5569 MeV (megaelectronvolts) daughter nuclide | Cf-246 decay mode | ϵ (electron capture) branching ratio | 10% Q-value | 847 keV (kiloelectronvolts) daughter nuclide | Es-250 decay mode | SF (spontaneous fission) branching ratio | 6.9×10^-5
Decay chain
Decay chain
Mass properties
atomic number (Z) | 100 mass number (A) | 250 neutron number | 150 atomic mass | 250.079521264 u (unified atomic mass units) mass excess | 74.073581 MeV (megaelectronvolts) binding energy per nucleon | 7.462084 MeV (megaelectronvolts)
Mass properties