Radioactive Decay Simulator — Atri Mishra

Decay Mode

Isotope / Name optional

Initial Amount N₀ atoms / grams

Half-life T½

Quick Presets

Parent

λ₁

Daughter

λ₂

Granddaughter

Parent (A)

Name

N₀

T½ (yrs)

Daughter (B)

Name

N₀ = 0

T½ (yrs)

Granddaughter (C) — Stable

Name

N₀ = 0

Chain Presets

Time Range (half-lives) 10

Log scale (Y axis) Show half-life markers Dark background

Key Equations

Single Decay

N(t) = N₀ · e^−λt
λ = ln2 / T½ = 0.693 / T½

Bateman Equation (Chain)

N_B(t) = N₀λ₁/(λ₂−λ₁) · (e^−λ₁t − e^−λ₂t)
N_C(t) = N₀ − N_A(t) − N_B(t)