To study on late effects by continuous gamma irradiations, the absorbed dose in mice was estimated in detail. A Cs-137 source was used for exposures. Dosimetry was performed with an air ionization chamber and a thermoluminescence dosimeter (TLD). The absorbed dose mapping of the gamma irradiation room was carried out by using the ionization chamber. Arcshaped racks with shelves made from wire net were designed on the basis of the dose map. The dose distributions in cages were measured under the racks and cages arrangements used during the experiments. Furthermore, by inserting TLD phosphors into abdomen of mice, exposure dose of the mice was actually measured under the experimental conditions.
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Shiragai et al. (1980) studied this question.