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Radiation Protection Dosimetry Advance Access originally published online on July 22, 2008
Radiation Protection Dosimetry 2008 131(3):340-345; doi:10.1093/rpd/ncn179
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© The Author 2008. Published by Oxford University Press. All rights reserved
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Reconsideration of the minimum dose constraint for public exposures in radiological protection

Takatoshi Hattori*

Radiation Safety Research Center, Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1, Iwadokita, Komae-shi, Tokyo, Japan

* Corresponding author: thattori{at}criepi.denken.or.jp

Received October 10, 2007, amended May 20, 2008, accepted June 10, 2008

By using a probabilistic approach, the effects of the dose distribution of radiation due to man-made radioactive nuclides when added to those of natural background radiation have been studied. These results show that additional exposure to man-made radiation of up to 0.5 mSv y–1 (as a dose constraint) would not significantly change the distribution of total public doses. Taking into consideration such probabilistic analysis and rationales of derivations of exemption and clearance levels, it can be concluded that the minimum dose constraint that requires optimisation in radiation protection, should be set to 0.1 mSv y–1, which is one-order magnitude higher than 0.01 mSv y–1, the current dose criterion for exemption and clearance.


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