Input interpretation
No-257 | half-life
Result
25 seconds (22.6 to 27.4 s)
Decay properties
half-life | 25 seconds (22.7 to 27.3 s) mean lifetime | 36 seconds (32.8 to 39.3 s) decay constant | 0.028 per second specific activity | 6.5×10^7 TBq/g (terabecquerels per gram) width | 1.8×10^-17 eV (electronvolts) decay modes | α (alpha emission) | β^+ (positron emission) final decay products | Tl-205 (100%) | Pb-207 (7×10^-10%)
Comparison as half-life
≈ ( 0.083 ≈ 1/12 ) × half-life of uranium-241 ( ≈ 300 s )