Check some back issues of JHL--Galactopharmacopedia has had at least two articles on radiopharmaceuticals. Tells what levels are in breastmilk and the half-life, etc. This may help you to help the mother (Martha--aka Queen Clueless). Def. of LC service: "We are all faced with a series of great opportunities brilliantly disguised as impossible situations." Kathleen G. Auerbach,PhD, IBCLC - [log in to unmask]