Abstract
Concerns of increased risk from tritium intakes by humans have been claimed in the past years. The arguments concerning radiobiological efficiency assessment, longer retention in human body, and the DNA’s hydration shell are analysed in this paper. A biokinetic model for tritiated water and organically bound tritium retention in human body is used, based on a common approach for mammals using energy and hydrogen metabolism and tested separately with animal experiments. Extension to humans considers the increased role of brain, food quality and unique growth patterns of humans. Various ages and genders for Caucasians are considered. For an intake of tritium in organic forms in the diet, the retention for the female of about a factor 2 compared with ICRP recommendations. Effective dose coefficients are determined to be about a factor of 2–3 higher than those of the ICRP.
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