I think the song is called Strontium Ninety, ca late 50's, attributed to Inman and Ira, and there my personal thread runs out. (It is called CRS, for those who can't afford Alzheimer's) I can remember singing it while in college, where it was a pointed reminder that Strontium 90 was one of the many radioactive byproducts of nuclear bombs, especially dangerous as it would happily substitute for/replace the Calcium in your bones, to the danger of both you and your bones.

I'm sure it appeared in Sing Out, and might have made it into one of their many reprints, perhaps even Rise up Singing.

Dave