![]() ![]() All body water, including sputum, blood, urine, perspiration, and humidity in exhaled breath are assumed to contain the same concentration of tritium. The tritium delivers tissue dose through the weak beta radiation that is readily absorbed. In such instances, the tritiated water distributes uniformly among all the body water and the water, in turn, is assumed to distribute uniformly among all soft tissues of the body. The major concern with tritium exposure generally relates to its ingestion or inhalation as tritiated water for which the allowed intake is much less than for elemental tritium. I shall base my answers on the methodologies that applied at the time that current US Nuclear Regulatory Commission (NRC) 10 CFR 20 regulations were implemented, those being primarily International Commission on Radiological Protection (ICRP) Publications 26 and 30. I shall attempt to address each part of your question.
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