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Radiation Protection Dosimetry Advance Access originally published online on June 19, 2007
Radiation Protection Dosimetry 2007 124(4):289-318; doi:10.1093/rpd/ncm214
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Modelling of aircrew radiation exposure from galactic cosmic rays and solar particle events

M. Takada1, B. J. Lewis2,*, M. Boudreau2, H. Al Anid2 and L. G. I. Bennett2

1 National Institute of Radiological Science, International Space Radiation Laboratory, 4-9-1, Anagawa, Inage-Ku, Chiba, 263-8555, Japan
2 Department of Chemistry and Chemical Engineering, Royal Military College of Canada, PO Box 17000, Kingston, Ontario, CANADA K7K 7B4

* Corresponding author: lewis-b{at}rmc.ca

Received November 15, 2006, amended February 26, 2007, accepted March 5, 2007

Correlations have been developed for implementation into the semi-empirical Predictive Code for Aircrew Radiation Exposure (PCAIRE) to account for effects of extremum conditions of solar modulation and low altitude based on transport code calculations. An improved solar modulation model, as proposed by NASA, has been further adopted to interpolate between the bounding correlations for solar modulation. The conversion ratio of effective dose to ambient dose equivalent, as applied to the PCAIRE calculation (based on measurements) for the legal regulation of aircrew exposure, was re-evaluated in this work to take into consideration new ICRP-92 radiation-weighting factors and different possible irradiation geometries of the source cosmic-radiation field. A computational analysis with Monte Carlo N-Particle eXtended Code was further used to estimate additional aircrew exposure that may result from sporadic solar energetic particle events considering real-time monitoring by the Geosynchronous Operational Environmental Satellite. These predictions were compared with the ambient dose equivalent rates measured on-board an aircraft and to count rate data observed at various ground-level neutron monitors.


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