Input interpretation
Es-254 (einsteinium-254) | Au-193 (gold-193)
Decay properties
| Es-254 | Au-193 half-life | 275.7 days (275.17 to 276.23 days) | 17.65 h (17.498 to 17.802 h) mean lifetime | 397.8 days (396.99 to 398.51 days) | 25.464 h (25.245 to 25.682 h) decay constant | 2.91×10^-8 per second | 1.0909×10^-5 per second specific activity | 68.96 TBq/g | 34045 TBq/g width | 1.915×10^-23 eV | 7.18×10^-21 eV decay modes | α (alpha emission) | ϵ (electron capture) | β^- (electron emission) | SF (spontaneous fission) | β^+ (positron emission) | α (alpha emission) final decay products | Pb-206 (100%) | Tl-205 (2×10^-8) | Pb-208 (2.6×10^-11) | W-184 (9×10^-14) | Yb-168 (5×10^-29) | Er-164 (4×10^-29) | Dy-160 (2×10^-30) | Dy-156 (1×10^-32) | Sm-144 (1×10^-33) | Ce-140 (1×10^-34) | Dy-164 (0) | Er-168 (0) | Gd-156 (0) | Hf-176 (0) | Hf-180 (0) | Sm-152 (0) | Yb-172 (0) | Ir-193 (100%) | Os-189 (1×10^-7)
Decay modes
Es-254
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 | 3×10^-4 Q-value | 651.2 keV (kiloelectronvolts) daughter nuclide | Cf-254 decay mode | β^- (electron emission) branching ratio | 1.74×10^-6 Q-value | 1.0878 MeV (megaelectronvolts) daughter nuclide | Fm-254 decay mode | SF (spontaneous fission) branching ratio | 3×10^-8
Au-193
decay mode | β^+ (positron emission) branching ratio | 100% Q-value | 60.5 keV (kiloelectronvolts) daughter nuclide | Pt-193 decay mode | α (alpha emission) branching ratio | 1×10^-7 Q-value | 2.6338 MeV (megaelectronvolts) daughter nuclide | Ir-189
Radiation shielding
| Es-254 lead | 21.6 µm water | 57.9 µm air | 52.7 mm
Decay chain
Es-254
Decay chain Es-254
Au-193
Decay chain Au-193
Mass properties
| Es-254 | Au-193 atomic number (Z) | 99 | 79 mass number (A) | 254 | 193 neutron number | 155 | 114 atomic mass | 254.088022021 u (unified atomic mass units) | 192.964149715 u (unified atomic mass units) mass excess | 81.991986 MeV (megaelectronvolts) | -33.394325 MeV (megaelectronvolts) binding energy per nucleon | 7.443584 MeV (megaelectronvolts) | 7.92411 MeV (megaelectronvolts)
Mass properties