Input interpretation
Ca-40 Hf-174 | half-life
Results
Ca-40 | 3×10^21 years (9.12×10^8 to ∞ s) Hf-174 | 2 quadrillion years (1.4 million to 2.7 million Gyr)
Units
Relative values
| visual | ratios | | comparisons Hf-174 | | 7×10^-7 | 1 | 99.99993% smaller Ca-40 | | 1 | 1.5 million | 1.5×10^8% larger
Decay properties
| Ca-40 | Hf-174 half-life | 3×10^21 yr (9.13×10^8 to ∞ s) | 2 quadrillion yr (1.4 million to 2.7 million Gyr) mean lifetime | 4.3×10^21 yr (1.31×10^9 to ∞ s) | 2.9 quadrillion yr (2.28 million to 3.7 million Gyr) decay constant | 7.3×10^-30 per second | 1.1×10^-23 per second specific activity | 1.1×10^-7 Bq/g | 0.038 Bq/g width | 3.3×10^-45 eV | 7.2×10^-39 eV decay modes | 2β^+ (double beta decay) | α (alpha emission) | 2β^+ (double beta decay) final decay products | Ca-40 (100%) | Ar-40 (0%) | Yb-170 (100%) | Yb-174 (0%)