678e89c5___CTBTO_Preparatory_Commission__Health_hazards
[Radionuclide] Americium-241 (241Am) [Half-life*] 432 years [Health hazards] 
Moves rapidly through the body after ingestion and is concentrated within the bones for a long period of time. During this storage americium will slowly decay and release radioactive particles and rays. These rays can cause alteration of genetic materials and bone cancer.
General overview of the effects of nuclear testing: CTBTO Preparatory Commission
Health hazards