Skip to ContentSkip to Navigation
Education Programmes Other study opportunities Groningen Academy for Radiation Protection


The quantity half-life (t½) is the period of time after which the activity is reduced to half the original value. De corresponding unit is second (s).

The quantity decay constant (λ) is the fraction of the activity that decays per unit of time (in s-1). The relation between half-life and decay constant is:

λ = ln(2)/t½

Related quantities

Last modified:15 January 2021 8.41 p.m.
View this page in: Nederlands