678e89c5___CTBTO_Preparatory_Commission__Health_hazards
[Radionuclide] Tritium (3H) [Half-life*] 12 years [Health hazards] 
Easily ingested. Can be inhaled as a gas in the air or absorbed through the skin. Enters soft tissues and organs. Exposure to tritium increases the risk of developing cancer. Beta radiation emitted by tritium can cause lung cancer.
General overview of the effects of nuclear testing: CTBTO Preparatory Commission
Health hazards