RÉSUMÉWithin the framework of a seminar on environmental and health impact of tritium organized by article 31 Euratom expert group in November 2007, it was expected to make a point on tritium knowledge and to define R&D and regulatory axes. This document presents the different sources of tritium, different methods of measurement associated to tritium processes and survey, transfer in the biosphere compartments in normal and accidental conditions. It suggests some R&D subjects and discusses some regulatory aspects.

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