Urine samples from eight male radiation workers who had an unplanned acute tritiated water intake were measured for tritium-in-urine up to 300 d post-exposure.
During the first month or so post-exposure, these individuals increased their fluid intakes to accelerate the turnover rate of tritium in the body for dose mitigation.
Their daily fluid intakes reverted to normal levels in the latter period of the study.
A non-linear regressional analysis of the tritium-in-urine data showed that the average biological half-life of tritium in body water, with standard deviation, was 6.3 ± 1.0 d (range, 5.0-8.1 d) and 8.4 ± 2.0 d (range, 6.2-12.8 d) during the respective periods of increased fluid intake and the later period of normal fluid intake.
A longer term component of tritium excretion was also observed with average biological half-life of 74 ± 18 d (range, 58-104 d), indicating the incorporation of tritium, and its retention, in the organic fractions of the body.
A mathematical model was developed and used to estimate the dose increase from the metabolized organically bound tritium on the basis of the kinetics of tritium-in-urine.
The model accounts for a change in the rates of urinary excretion caused by variable fluid intakes.
The average dose to the body, for the eight male workers, due to the metabolized organically bound tritium was estimated to be 6.2 ± 1.3% (range, 3.5% to 8.9%) of the committed effective dose due to tritium in the body water. (...)
Mots-clés Pascal : Homme, Radiocontamination, Exposition professionnelle, Chaîne alimentaire, Pollution eau, Tritium, Dosimétrie, Urine, Modèle mathématique, Radioprotection, Rétention
Mots-clés Pascal anglais : Human, Radioactive contamination, Occupational exposure, Trophic chain, Water pollution, Tritium, Dosimetry, Urine, Mathematical model, Radioprotection, Retention
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0506356
Code Inist : 002A08F03. Création : 13/02/1998.