Galactic and Solar Radiation Exposure to Aircrew during a Solar Cycle

An on-going investigation using a tissue-equivalent proportional counter (TEPC) has been carried out to measure the ambient dose equivalent rate of the cosmic radiation exposure of aircrew during a solar cycle. A semi-empirical model has been derived from these data to allow for the interpolation of...

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Bibliographic Details
Published in:Radiation protection dosimetry 2002-01, Vol.102 (3), p.207-228
Main Authors: J. Lewis, B., G. I. Bennett, L., R. Green, A., J. McCall, M., Ellaschuk, B., Butler, A., Pierre, M.
Format: Article
Language:English
Subjects:
Aerospace Medicine - methods
Aircraft
Altitude
Aviation
Background Radiation
Biological and medical sciences
Canada
Computer Simulation
Cosmic Radiation
Humans
Medical sciences
Models, Biological
Occupational Exposure
Radiation Dosage
Radiometry - instrumentation
Radiometry - methods
Radiometry - standards
Reproducibility of Results
Sensitivity and Specificity
Solar Activity
Whole-Body Counting - methods
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Summary:An on-going investigation using a tissue-equivalent proportional counter (TEPC) has been carried out to measure the ambient dose equivalent rate of the cosmic radiation exposure of aircrew during a solar cycle. A semi-empirical model has been derived from these data to allow for the interpolation of the dose rate for any global position. The model has been extended to an altitude of up to 32 km with further measurements made on board aircraft and several balloon flights. The effects of changing solar modulation during the solar cycle are characterised by correlating the dose rate data to different solar potential models. Through integration of the dose-rate function over a great circle flight path or between given waypoints, a Predictive Code for Aircrew Radiation Exposure has been further developed for estimation of the route dose from galactic cosmic radiation exposure. This estimate is provided in units of ambient dose equivalent as well as effective dose, based on E/H*(10) scaling functions as determined from transport code calculations with LUIN and FLUKA. This experimentally based treatment has also been compared with the CARI-6 and EPCARD codes that are derived solely from theoretical transport calculations. Using TEPC measurements taken aboard the International Space Station, ground based neutron monitoring, GOES satellite data and transport code analysis, an empirical model has been further proposed for estimation of aircrew exposure during solar particle events. This model has been compared to results obtained during recent solar flare events.
ISSN:0144-8420
1742-3406
DOI:10.1093/oxfordjournals.rpd.a006091