Radionuclides produced by past nuclear weapon test explosions comprise the largest source of anthropogenic radioactivity released into the earth's atmosphere to date. This volume presents data and models about the fate of the released radionuclides and their possible effects on human health. It is divided into the following three parts: - Source Term Studies;- Dose Reconstruction;- Ecological and Health Effects,and comprises both Western and formerly secret Soviet research studies, illuminates past and current research.