Evaluation of World Population-Weighted Effective Dose due to Cosmic Ray Exposure.
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ABSTRACT: After the release of the Report of the United Nations Scientific Committee of the Effects of Atomic Radiation in 2000 (UNSCEAR2000), it became commonly accepted that the world population-weighted effective dose due to cosmic-ray exposure is 0.38?mSv, with a range from 0.3?to 2?mSv. However, these values were derived from approximate projections of altitude and geographic dependences of the cosmic-ray dose rates as well as the world population. This study hence re-evaluated the population-weighted annual effective doses and their probability densities for the entire world as well as for 230 individual nations, using a sophisticated cosmic-ray flux calculation model in tandem with detailed grid population and elevation databases. The resulting world population-weighted annual effective dose was determined to be 0.32?mSv, which is smaller than the UNSCEAR's evaluation by 16%, with a range from 0.23 to 0.70?mSv covering 99% of the world population. These values were noted to vary with the solar modulation condition within a range of approximately 15%. All assessed population-weighted annual effective doses as well as their statistical information for each nation are provided in the supplementary files annexed to this report. These data improve our understanding of cosmic-ray radiation exposures to populations globally.
SUBMITTER: Sato T
PROVIDER: S-EPMC5030634 | biostudies-literature | 2016 Sep
REPOSITORIES: biostudies-literature
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