In article ,
"Dan Welch" wrote:

thanks Keith. I take it Co-60 is particularly nasty. I didn't know if the
whole idea of Cobalt bombs was enhanced blast, radiation, etc.

Enhanced fallout, mainly.

Co60 is a gamma and beta emitter, with a half-life of about 5 years;
pretty hot, and if ingested will dump most of its load during the
ingestees normal life, assuming a sublethal dose.

It's used for some medical applications.