Input interpretation
Th-232 (thorium-232) | U-238 (uranium-238)
Natural abundance
Th-232 | U-238 100% | 99.2742%
Decay properties
| Th-232 | U-238 half-life | 14 Gyr (-18 to 40 Gyr) | 4.47 Gyr (4.464 to 4.4745 Gyr) mean lifetime | 20.2 Gyr (-30 to 90 Gyr) | 6.45 Gyr (6.4453 to 6.4552 Gyr) decay constant | 1.57×10^-18 per second | 4.916×10^-18 per second specific activity | 4.07 kBq/g | 12.44 kBq/g width | 7.16×10^-34 eV | 3.236×10^-33 eV decay modes | α (alpha emission) | SF (spontaneous fission) | ^24Ne +^26Ne (double cluster emission) | 2β^- (double beta decay) | α (alpha emission) | SF (spontaneous fission) | 2β^- (double beta decay) final decay products | Pb-208 (100%) | Pb-206 (4×10^-11) | Pb-204 (0) | Hg-200 (0) | Hg-204 (0) | Pb-206 (100%) | Tl-205 (1.9×10^-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)
Decay modes
Th-232
decay mode | α (alpha emission) branching ratio | 100% Q-value | 4.0816 MeV (megaelectronvolts) daughter nuclide | Ra-228 decay mode | SF (spontaneous fission) branching ratio | 1.1×10^-11 decay mode | ^24Ne +^26Ne (double cluster emission) branching ratio | 2.78×10^-12 daughter nuclide | Yb-182 decay mode | 2β^- (double beta decay) Q-value | 837.57 keV (kiloelectronvolts) daughter nuclide | U-232
U-238
decay mode | α (alpha emission) branching ratio | 100% Q-value | 4.26975 MeV (megaelectronvolts) daughter nuclide | Th-234 decay mode | SF (spontaneous fission) branching ratio | 5.45×10^-7 decay mode | 2β^- (double beta decay) branching ratio | 2.2×10^-12 Q-value | 1.1442 MeV (megaelectronvolts) daughter nuclide | Pu-238
Radiation shielding
| Th-232 | U-238 lead | 11.7 µm | 12.3 µm water | 27.9 µm | 29.8 µm air | 25.4 mm | 27.1 mm
Decay chain
Th-232
Decay chain Th-232
U-238
Decay chain U-238
Mass properties
| Th-232 | U-238 atomic number (Z) | 90 | 92 mass number (A) | 232 | 238 neutron number | 142 | 146 atomic mass | 232.038055325 u (unified atomic mass units) | 238.050788247 u (unified atomic mass units) mass excess | 35.448307 MeV (megaelectronvolts) | 47.308948 MeV (megaelectronvolts) binding energy per nucleon | 7.615026 MeV (megaelectronvolts) | 7.57012 MeV (megaelectronvolts)
Mass properties