Input interpretation
U-235 U-234 | half-life
Results
U-235 | 0.704 Gyr (gigayears) (702.1 to 706.8 Myr) U-234 | 0.2455 Myr (megayears) (-4 to 4 Myr)
Units
Relative values
| visual | ratios | | comparisons U-234 | | 3.49×10^-4 | 1 | 99.9651% smaller U-235 | | 1 | 2870 | 287000% larger
Decay properties
| U-235 | U-234 half-life | 0.704 Gyr (702.2 to 706.6 Myr) | 0.2455 Myr (-4 to 4 Myr) mean lifetime | 1.02 Gyr (1.014 to 1.019 Gyr) | 0.3542 Myr (-8 to 8 Myr) decay constant | 3.12×10^-17 per second | 8.953×10^-14 per second specific activity | 79.8 kBq/g | 230.4 MBq/g width | 2.05×10^-32 eV | 4.084×10^-29 eV decay modes | α (alpha emission) | SF (spontaneous fission) | ^28Mg (cluster emission) | ^25Ne (cluster emission) | ^20Ne (cluster emission) | α (alpha emission) | SF (spontaneous fission) | ^28Mg (cluster emission) | ^24Ne +^26Ne (double cluster emission) final decay products | Pb-207 (100%) | Tl-205 (9×10^-8%) | Pb-206 (8×10^-10%) | Pb-208 (1×10^-12%) | Pb-206 (100%) | Tl-205 (1.9×10^-6%) | Pb-208 (2.6×10^-9%) | W-184 (9×10^-12%) | Hf-180 (0%)