Input interpretation
Es-254 | decay modes
Result
α (alpha emission) | ϵ (electron capture) | β^- (electron emission) | SF (spontaneous fission)
Decay properties
half-life | 275.7 days (275.17 to 276.23 days) mean lifetime | 397.8 days (396.99 to 398.51 days) decay constant | 2.91×10^-8 per second specific activity | 68.96 TBq/g (terabecquerels per gram) width | 1.915×10^-23 eV (electronvolts) decay modes | α (alpha emission) | ϵ (electron capture) | β^- (electron emission) | SF (spontaneous fission) final decay products | Pb-206 (100%) | Tl-205 (2×10^-6%) | Pb-208 (2.6×10^-9%) | W-184 (9×10^-12%) | Yb-168 (5×10^-27%) | Er-164 (4×10^-27%) | Dy-160 (2×10^-28%) | Dy-156 (1×10^-30%) | Sm-144 (1×10^-31%) | Ce-140 (1×10^-32%) | 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 | 100% Q-value | 6.6157 MeV (megaelectronvolts) daughter nuclide | Bk-250 decay mode | ϵ (electron capture) branching ratio | 0.03% Q-value | 651.2 keV (kiloelectronvolts) daughter nuclide | Cf-254 decay mode | β^- (electron emission) branching ratio | 1.74×10^-4% Q-value | 1.0878 MeV (megaelectronvolts) daughter nuclide | Fm-254 decay mode | SF (spontaneous fission) branching ratio | 3×10^-6%