Half-Life Lab
N(t) and activity curves, isotope presets, half-life table, and animated decay of a sample.
About this tool
Half-Life Lab — exponential decay N(t)=N₀·(1/2)^{t/t½}. N₀ is a number of atoms, so activity A=λN is reported in Bq. Pick an isotope or enter t½, drag time in half-lives, read λ, τ, activity, and the table. The deterministic curve does not simulate individual random decays.