678e89c5___CTBTO_Preparatory_Commission__Health_hazards
[Radionuclide] Plutonium-239 (239Pu) [Half-life*] 24,400 years [Health hazards] 
Released when a plutonium weapon is exploded. Ingestion of even a miniscule quantity is a serious health hazard and can cause lung, bone, and liver cancer. The highest doses are to the lungs, the bone marrow, bone surfaces, and liver.
General overview of the effects of nuclear testing: CTBTO Preparatory Commission
Health hazards