Input interpretation
U-238 Cm-248 | half-life
Results
U-238 | 4.47 Gyr (gigayears) (4.463 to 4.4745 Gyr) Cm-248 | 0.35 Myr (megayears) (0.3415 to 0.3548 Myr)
Units
Relative values
| visual | ratios | | comparisons Cm-248 | | 7.8×10^-5 | 1 | 99.9922% smaller U-238 | | 1 | 13000 | 1.3×10^6% larger
Decay properties
| U-238 | Cm-248 half-life | 4.47 Gyr (4.464 to 4.4745 Gyr) | 0.35 Myr (0.3416 to 0.3547 Myr) mean lifetime | 6.45 Gyr (6.4453 to 6.4552 Gyr) | 0.501 Myr (0.4931 to 0.5114 Myr) decay constant | 4.916×10^-18 per second | 6.33×10^-14 per second specific activity | 12.44 kBq/g | 154 MBq/g width | 3.236×10^-33 eV | 4.15×10^-29 eV decay modes | α (alpha emission) | SF (spontaneous fission) | 2β^- (double beta decay) | α (alpha emission) | SF (spontaneous fission) | 2β^- (double beta decay) 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 (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%) | Pb-208 (90%) | Pb-206 (3.7×10^-9%) | Pb-204 (0%) | Hg-200 (0%) | Hg-204 (0%)