Radioactive decay and half-life
How much of a sample remains after a given time, given its half-life.
- Half-life calculations
Decay
Half-lives elapsed1
Remaining50N = N₀ × (1/2)^(t/t½)
Decayed50
Fraction remaining50%
Decay constant λ0.0001209681λ = ln2 / t½
Mean lifetime τ8,266.64258429τ = 1 / λ, longer than the half-life
Time to 1% remaining38,069.295967