Radioactive Series Calculator

Calculate parent-daughter decay chain activities and equilibrium

Time Unit:

Parent Half-life (hours):

Daughter Half-life (hours): (optional)

Initial Activity (Bq): (optional)

Time (hours): (optional)

About Radioactive Series

When radioactive decay produces another radioactive isotope, a decay chain or series forms. The relative activities depend on the half-lives and may reach different types of equilibrium.

Bateman Equations:

A₁(t) = A₀ e^(-λ₁t)
A₂(t) = A₀ × λ₂/(λ₂-λ₁) × [e^(-λ₁t) - e^(-λ₂t)]

Equilibrium Types:

Secular: T1 >> T2, A1 = A2
Transient: T1 > T2, A2 > A1
No equilibrium: T1 < T2