Input interpretation
Cm-242 (curium-242) | Rg-279 (roentgenium-279)
Decay properties
| Cm-242 | Rg-279 half-life | 162.8 days (162.57 to 163.02 days) | 3 s mean lifetime | 234.8 days (234.56 to 235.17 days) | 4 s decay constant | 4.929×10^-8 per second | 0.2 per second specific activity | 122.6 TBq/g | 5×10^8 TBq/g width | 3.244×10^-23 eV | 2×10^-16 eV decay modes | α (alpha emission) | SF (spontaneous fission) | ^34Si (cluster emission) | 2β^+ (double beta decay) | α (alpha emission) | SF (spontaneous fission) final decay products | Pb-206 (100%) | Tl-205 (1.9×10^-6%) | Pb-208 (2.6×10^-9%) | W-184 (9×10^-12%) | Yb-168 (2×10^-15%) | Er-164 (2×10^-15%) | Dy-160 (8×10^-17%) | Dy-156 (5×10^-19%) | Sm-144 (5×10^-20%) | Ce-140 (5×10^-21%) | Dy-164 (0%) | Er-168 (0%) | Gd-156 (0%) | Hf-176 (0%) | Hf-180 (0%) | Sm-152 (0%) | Yb-172 (0%) | Pb-206 (0%) | Pb-207 (0%) | Pb-208 (0%) | Tl-205 (0%)
Decay modes
Cm-242
decay mode | α (alpha emission) branching ratio | 100% Q-value | 6.21556 MeV (megaelectronvolts) daughter nuclide | Pu-238 decay mode | SF (spontaneous fission) branching ratio | 6.2×10^-6% decay mode | ^34Si (cluster emission) branching ratio | 1.1×10^-14% daughter nuclide | Pb-208 decay mode | 2β^+ (double beta decay) Q-value | -1.95757 MeV (megaelectronvolts) daughter nuclide | Pu-242
Rg-279
decay mode | α (alpha emission) daughter nuclide | Mt-275 decay mode | SF (spontaneous fission)
Radiation shielding
| Cm-242 lead | 19.9 µm water | 52.5 µm air | 47.8 mm
Decay chain
Cm-242
Decay chain Cm-242
Rg-279
Decay chain Rg-279
Mass properties
| Cm-242 | Rg-279 atomic number (Z) | 96 | 111 mass number (A) | 242 | 279 neutron number | 146 | 168 atomic mass | 242.058835824 u (unified atomic mass units) | 279.162468 u (unified atomic mass units) mass excess | 54.805218 MeV (megaelectronvolts) | 151.338 MeV (megaelectronvolts) binding energy per nucleon | 7.534497 MeV (megaelectronvolts) | 7.218 MeV (megaelectronvolts)
Mass properties