W. Bauer, Learning Online Network

This website features an animation of the process of radioactive decay. Users can select the half life of the nuclei and watch them decay away as a function of time. Shown also is a histogram of the number of nuclei remaining at a given time.

This resource is referenced here:
Subject: Geoscience:Geology:Geochemistry:RadioisotopesKeywords: absolute age, geologic time