Verification of the PHITS-based analytical model for dosimetry of cosmic radiation exposure in aircraft

Yasuda, Hiroshi*; Sato, Tatsuhiko   ; Takada, Masashi*; Nakamura, Takashi*

It is important to know accurately energy spectra of energetic neutrons (10MeV) for radiological protection of aircraft and spacecraft crew. We thus try to develop a portable neutron detector which can automatically measure energetic cosmic neutrons in the high-energy range separately from charged particles and rays. For testing the feasibility of our concept, experiments of cosmic radiation measurements were performed in a jet aircraft using various detectors (scintillation counters, dose-equivalent counters and an ionization chamber). The measured data were compared to model calculations using the PHITS-based analytical code.