Physical
Isotope decay
Remaining radioactivity after time, by half-life.
A = A0 x e^(-0.693 t / t_half)
32P 14.3 d, 33P 25.4 d, 35S 87.4 d, 125I 59.4 d, 3H 12.3 y.
Protocol result
⚗ Aliquot
Isotope decay · A = A0 · exp(-ln2 · t / t½) · the lab bench, calculated
Isotope decay✓ A = A0 · exp(-ln2 · t / t½)
After this time, 50 remains (50% of the start).
1
Remaining activity: 50, 50% of the original.
Start
100
Remaining
50
Fraction
50%