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-functions proposed by ICRP, ICRU, and NASASato, Tatsuhiko; Endo, Akira; Niita, Koji*
Advances in Space Research, 52(1), p.79 - 85, 2013/07
Times Cited Count：10 Percentile：47.54(Engineering, Aerospace)For the risk estimation of astronauts due to cosmic-ray exposure, not only organ absorbed doses but also their mean quality factors must be evaluated, since the radiation weighting factor is not suitable for use in space dosimetry due to its oversimplified concept. We therefore calculated the mean quality factors in organs and tissues in the ICRP reference voxel phantoms irradiated by various particles, using the PHITS code coupled with the ICRP, ICRU and NASA relationships. The isotropic irradiation was assumed in the calculation. The details of the calculation procedure will be presented at the meeting, together with the comparison between the mean quality factors obtained from the 3 relationships. The influence of the consideration of the track structure on the risk estimation will be also discussed.
Sato, Tatsuhiko; Kataoka, Ryuho*; Yasuda, Hiroshi*; Yashiro, Seiji*; Kuwabara, Takao*; Shiota, Daiko*
no journal, ,
We are trying to develop a two-step forecast system for the SEP doses named WASAVIES (WArning System of AVIation Exposure to SEP). The present status of the development of WASAVIES will be reported at the meeting, together with a brief summary of the currently operating systems for estimating the GCR and SEP doses.
Ota, Shuya; Sihver, L.*; Kobayashi, Shingo*; Hasebe, Nobuyuki*
no journal, ,
Neutron production by galactic cosmic rays (GCR) in the lunar subsurface plays an important role in the radiation environment on the surface and subsurface of the Moon and to make its accurate estimation is therefore very important for lunar and planetary nuclear spectroscopy and space dosimetry. In this work, the depth dependency of neutron production from protons and alpha particles in galactic cosmic ray (GCR) was estimated using the three-dimensional particle and heavy ion transport simulation code PHITS incorporating the latest high energy nuclear data, JENDL-HE. Our estimation of equilibrium neutron density profiles in the lunar subsurface was compared with the experimental data obtained by Apollo 17 Lunar Neutron Probe Experiment (LNPE). As the results, our calculation successfully reproduced the LNPE data within experimental errors of 15% (measurement) + 30% (systematic).
