``Radioactive Chains: Parents and Daughters,'' by Brindell Horelick and Sinan Koont, UMAP 234. When a radioactive substance A decays into a substance B, A and B are called parent and daughter. It may happen that B is radioactive and is the parent of a new daughter C, and so on. There are three radioactive chains that together account for all naturally occurring radioactive substances beyond thallium on the periodic table. This unit develops models for calculating the amounts of the substances in radioactive chains and discusses transient and secular states of equilibrium between parent and daughter.

Complete the requirements of the indicated UMAP module. (See enclosed CD for UMAP modules.)