PARMA: PHITS-based Analytical Radiation Model in the Atmosphere--Verification of Its Accuracy in Estimating Cosmic Radiation Doses

Journal Article · Thu Aug 07 00:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2991285· OSTI ID:21152507

Sato, Tatsuhiko; Satoh, Daiki; Endo, Akira ^[1]; Yasuda, Hiroshi; Takada, Masashi ^[2]; Nakamura, Takashi ^[1]; Niita, Koji ^[3]; Sihver, Lembit ^[4]

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1. Japan Atomic Energy Agency, Shirakata-Shirane 2-4, Tokai, Ibaraki, 319-1195 (Japan)
2. National Institute of Radiological Science, Anagawa 4-9-1, Inage, Chiba, 263-8555 (Japan)
3. Research Organization for Information Science and Technology, Shirakata-Shirane 2-4, Tokai, Ibaraki, 319-1106 (Japan)
4. Chalmers University of Technology, Fysikgrand 3, SE-412 96, Gothenburg (Sweden)

Estimation of cosmic-ray spectra in the atmosphere has been an essential issue in the evaluation of the aircrew doses. We therefore developed an analytical model that can predict the terrestrial neutron, proton, He nucleus, muon, electron, positron and photon spectra at altitudes below 20 km, based on the Monte Carlo simulation results of cosmic-ray propagation in the atmosphere performed by the PHITS code. The model was designated PARMA. In order to examine the accuracy of PARMA in terms of the neutron dose estimation, we measured the neutron dose rates at the altitudes between 20 to 10400 m, using our developed dose monitor DARWIN mounted on an aircraft. Excellent agreement was observed between the measured dose rates and the corresponding data calculated by PARMA coupled with the fluence-to-dose conversion coefficients, indicating the applicability of the model to be utilized in the route-dose calculation.

• OSTI ID: 21152507
• Journal Information: AIP Conference Proceedings, Vol. 1034, Issue 1; Conference: NRE-VIII: 8. International symposium on the natural radiation environment, Buzios, RJ (Brazil), 7-12 Oct 2007; Other Information: DOI: 10.1063/1.2991285; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
ACCURACY
ALPHA SPECTRA
ALTITUDE
AVIATION PERSONNEL
COMPUTERIZED SIMULATION
COSMIC MUONS
COSMIC PHOTONS
COSMIC RAY PROPAGATION
DOSE RATES
DOSIMETRY
ELECTRON SPECTRA
MONTE CARLO METHOD
NEUTRON SPECTRA
P CODES
PERSONNEL MONITORING
RADIATION DOSES
RADIATION MONITORING
RADIATION MONITORS