Analyses of ICRP Publications for occupational intakes of radionuclides

Takahashi, Fumiaki  ; Manabe, Kentaro   ; Sato, Kaoru   

Safety standards for radiation are based on concepts of the 1990 Recommendations by the International Commission on Radiological Protection (ICRP) in Japan. ICRP has released the 2007 Recommendations that replace the 1990 Recommendations and then discussions have been made to revise the safety standards for radiation in Japan. Thus, we investigate Occupational Intakes of Radionuclides (OIR) by ICRP to clarify issues that should be considered for revisions on limitations for internal exposure. ICRP has continuously adopted internal exposure dosimetry by using effective dose coefficients with the unit of Sv/Bq. However, effective dose coefficients are not presented for radioisotopes whose half-lives are less than 10 minutes, in OIR. Exposure conditions should be discussed in regulating submersion exposure, in addition to radioisotopes.