Input interpretation
U-238 | half-life
Result
4.47 Gyr (gigayears) (4.463 to 4.4745 Gyr)
Decay properties
half-life | 4.47 Gyr (gigayears) (4.464 to 4.4745 Gyr) mean lifetime | 6.45 Gyr (gigayears) (6.4453 to 6.4552 Gyr) decay constant | 4.916×10^-18 per second specific activity | 12.44 kBq/g (kilobecquerels per gram) width | 3.236×10^-33 eV (electronvolts) decay modes | 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%)
Unit conversions
4.47 billion years
1.41×10^17 seconds
Comparisons as half-life
≈ ( 0.11 ≈ 1/9 ) × half-life of rhenium-187 ( 1.299×10^18 s )
≈ 6.4 × half-life of uranium-235 ( ≈ 2.22×10^16 s )