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Report No.
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Calculation of dose coefficients and concentration limits based on tissue weighting factors, et al. revised in the ICRP 2007 Recommendations (Contract research)

Manabe, Kentaro   ; Endo, Akira   

The dose coefficients and concentration limits provided by laws and their relevant public notices in Japan are based on the 1990 Recommendations of the International Commission on Radiological Protection (ICRP). In 2007, the ICRP published the new Recommendations which supersede the 1990 Recommendations. The 2007 Recommendations update tissue and radiation weighting factors to estimate equivalent and effective doses. Therefore, it is important to clarify the impact of these revisions on dose coefficients et al. in adopting the 2007 Recommendations for the system of radiation protection. In this study, dose coefficients et al. have been calculated using the revised tissue weighting factors and compared with those based on the 1990 Recommendations. For most nuclides, the dose coefficients calculated using weighting factors of the 2007 Recommendations decrease for inhalation and remain the same for ingestion. It was identified that the difference in dose coefficients is mainly due to the change in the procedure for calculating equivalent dose rather than the update of the weighting factors.

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