An Overview of Research at CRNL on the Environmental Aspects, Toxicity, Metabolism and Dosimetry of Tritium

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Abstract
The environmental transport, metabolism, toxicity and dosimetry of tritium has been the subject of many studies over the past 30 years at the Chalk River Nuclear Laboratories (CRNL). Recently, the planned introduction of tritium extraction facilities in heavy water reactors, and the use of tritium in fusion related research prompted the measurements of HT dispersion in the environment around the CRNL site. Possible routes of uptake of HT by man have also been reviewed and experiments to help quantify doses from these uptakes are being carried out. In addition, the relative biological effectiveness of tritium for gene conversion in yeast and for the promotion and induction of late stochastic effects (cancer) in animals has recently been studied. This paper gives a brief overview of these studies and the results to date.

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