Reported are the proceedings of an interdisciplinary symposium on the effects on the biosphere of the release of radiation from the use of nuclear energy. Papers given include discussions of the use of radioisotopes in medicine, the benefits and possible consequences of peaceful applications of nuclear explosives, methods of estimating maximum radiation dose, data on radioactive pollution, and data on effects of radiation in man and animals. Each paper is prefaced by an abstract and followed by a report of ensuing discussion. (EB)