Dear Fellow Radsafers, Does anyone know of a good reference that discusses hazards associated with various radionuclides such as Cs-137, Pu-239, U-235, etc.... and includes target organs, etc. Dan, Try looking in the ICRPs, they have a wealth of info. They also give the references to all of the studies performed so that you can look those up too. opinions are my own kbporch928@aol.com