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Development of software for calculating atmospheric cosmic-ray spectra instantaneously with precision
- Providing world-wide contour map of the cosmic-ray dose rates �
May. 29, 2007
Tatsuhiko Sato et al. of JAEA (Japan Atomic Energy Agency) [President Toshio Okazaki] and Hiroshi Yasuda et al. of NIRS (National Institute of Radiological Science) [President Yoshiharu Yonekura] collaborated in the establishment of the model for estimating the cosmic-ray spectra of neutrons, protons, He nuclei, muons, electrons, positrons and photons applicable to any location in the atmosphere at altitudes below 20 km. Based on the model, they have developed software named �EXPACS� that enables us to calculate the cosmic radiation doses instantaneously with precision by specifying the altitude, latitude and longitude, and time of interest. EXPACS has been released to the public via the web site 1 linked below.
Using the model coupled with the solar modulation potential estimated from the sunspot number, they provide the world-wide contour map of the cosmic-ray exposure dose rates at a typical flight altitude (~11km), which is automatically updated every day. The map is opened for the public via the web site 2 linked below.
In the near future, the model will be incorporated into the Japanese Internet System for Calculation of Aviation Route Doses �JISCARD�, and utilized for keeping the administered limitation dose (< 5 mSv/year) recommended for aircrews of Japanese airline companies.
Web site 1: EXPACS
http://www.jaea.go.jp/04/nsed/ers/radiation/rpro/EXPACS/expacs-eng.html
Web site 2: World-wide contour map of the cosmic-ray exposure dose rates (in Japanese)
http://www.nirs.go.jp/research/jiscard/information/index.shtml
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Location of environment monitoring posts measuring amount of
radiation. (details)
International link directory of related websites.
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