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Aircrew radiation dose estimates during recent solar particle events and the effect of particle anisotropy
journal contribution
posted on 2023-05-17, 20:06 authored by Al Anid, H, Lewis, BJ, Bennett, LGI, Takada, M, Marcus DuldigMarcus DuldigA model was developed using a Monte-Carlo radiation transport code, MCNPX, to estimate the additional radiation exposure to aircrew members during solar particle events. The model transports an extrapolated particle spectrum based on satellite measurements through the atmosphere to aircraft altitudes. This code produces the estimated flux at a specific altitude where radiation dose conversion coefficients are applied to convert the particle flux into effective and ambient dose-equivalent rates. A cut-off rigidity model accounts for the shielding effects of the Earth's magnetic field. Comparisons were made between the model predictions and actual flight measurements taken with various types of instruments used to measure the mixed radiation field during ground level enhancements (GLEs) 60 and 65. An anisotropy analysis that uses neutron monitor responses and the pitch angle distribution of energetic solar particles was used to identify particle anisotropy for a solar event in December 2006. In anticipation of future commercial use, a computer code has been developed to implement the radiation dose assessment model for routine analysis.
History
Publication title
Radiation Protection DosimetryVolume
158Pagination
355-367ISSN
0144-8420Department/School
School of Natural SciencesPublisher
Nuclear Technology PublPlace of publication
Po Box 7, Ashford, England, Kent, Tn23 1YwRights statement
Copyright 2013 Oxford University PressRepository Status
- Restricted