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El-Jaby, S.*; Tomi, L.*; Sihver, L.*; Sato, Tatsuhiko; Richardson, R. B.*; Lewis, B. J.*
Advances in Space Research, 53(5), p.810 - 817, 2014/03
Times Cited Count：2 Percentile：16.83(Engineering, Aerospace)This paper describes a methodology for assessing the pre-mission exposure of space crew aboard the International Space Station (ISS) in terms of an effective dose equivalent. In this approach, the PHITS Monte Carlo code was used to assess the particle transport of galactic cosmic radiation (GCR) and trapped radiation for solar maximum and minimum conditions through an aluminum shield thickness. From these predicted spectra, and using fluence-to-doseconversion factors, a scaling ratio of the effective dose equivalent rate to the ICRU ambient doseequivalent rate at a 10 mm depth was determined. Only contributions from secondary neutrons, protons, and alpha particles were considered in this analysis.
-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：8 Percentile：45.24(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.
Puchalska, M.*; Sihver, L.*; Sato, Tatsuhiko; Berger, T.*; Reitz, G.*
Advances in Space Research, 50(4), p.489 - 495, 2012/08
Times Cited Count：14 Percentile：63.94(Engineering, Aerospace)We will present simulations using the three-dimensional Monte Carlo Particle and Heavy Ion Transport code System (PHITS) of long term dose measurements performed with the ESA supported experiment MATROSHKA (MTR), which is an anthropomorphic phantom containing over 6000 radiation detectors, mimicking a human head and torso. The results confirm previous calculations and measurements which indicate that PHITS is a suitable tool for estimations of dose received from cosmic radiation and when performing shielding design studies of spacecraft.
Kol
skov
(Mrzov), Z.*; Sihver, L.*; Ambro
ov, I.*; Sato, Tatsuhiko; Spurn
, F.*; Shurshakov, V. A.*
Advances in Space Research, 49(2), p.230 - 236, 2012/01
Times Cited Count：12 Percentile：59.76(Engineering, Aerospace)In this paper we will present results of simulations of long term dose measurement inside the spherical phantom MATROSHKA-R located inside the crew cabin of ISS. Three-dimensional Monte Carlo Particle and Heavy Ion Transport code System (PHITS) has been used for this purpose. The simulation will be also compared with the experimental data measured with thermoluminescence and plastic nuclear track detectors inside and on the surface of the phantom in year 2006; both, absorbed dose and measured LET spectra will be presented.
Gustafsson, K.*; Sihver, L.*; Mancusi, D.*; Sato, Tatsuhiko; Reitz, G.*; Berger, T.*
Advances in Space Research, 46(10), p.1266 - 1272, 2010/11
Times Cited Count：12 Percentile：56.73(Engineering, Aerospace)A method for benchmarking and developing the code is to simulate experiments performed in space or on Earth. We have carried out the PHITS simulations of the Matroshka experiment which focus on determining the radiation load on astronauts inside and outside the International Space Station by using a torso of a tissue equivalent human phantom, filled with active and passive detectors located in the positions of critical tissues and organs. We will present status and results of our simulations.
Sihver, L.*; Sato, Tatsuhiko; Gustafsson, K.*; Mancusi, D.*; Iwase, Hiroshi*; Niita, Koji*; Nakashima, Hiroshi; Sakamoto, Yukio; Iwamoto, Yosuke; Matsuda, Norihiro
Advances in Space Research, 45(7), p.892 - 899, 2010/04
Times Cited Count：27 Percentile：77.64(Engineering, Aerospace)We will first present the current status of the General-Purpose Particle and Heavy-Ion Transport code System (PHITS). In particular, we will describe benchmarking of calculated cross sections against measurements; we will introduce a relativistically covariant version of JQMD, called R-JQMD, that features an improved ground-state initialization algorithm, and we will show heavy-ion charge-changing cross sections simulated with R-JQMD and compare them to experimental data and to results predicted by the JQMD model.
Sihver, L.*; Mancusi, D.*; Sato, Tatsuhiko; Niita, Koji*; Iwase, Hiroshi*; Iwamoto, Yosuke; Matsuda, Norihiro; Nakashima, Hiroshi; Sakamoto, Yukio
Advances in Space Research, 40(9), p.1320 - 1331, 2007/00
Times Cited Count：41 Percentile：87.95(Engineering, Aerospace)The General-Purpose Particle and Heavy-Ion Transport code System (PHITS) is based on NMTC and MCNP for nucleon/meson and neutron transport respectively; it includes the JAM hadron cascade model for high energy particle-induced reactions and JQMD for nucleus-nucleus collisions; the evaporation and/or fission stage of the reactions is handled by the GEM code. The experimental partial fragmentation cross sections appear to be systematically underestimated by a factor which is independent on the fragment species within the same data set. However, the simulated neutron energy spectra show generally a good agreement with measurements, and so do the attenuation and Bragg curves. These observations stimulate further benchmarking and give directions on possible improvements to be applied to the code in the near future.
Sato, Tatsuhiko; Sihver, L.*; Iwase, Hiroshi*; Nakashima, Hiroshi; Niita, Koji*
Advances in Space Research, 35(2), p.208 - 213, 2005/06
Times Cited Count：26 Percentile：81.00(Engineering, Aerospace)In order to estimate the biological effects of HZE particles, an accurate knowledge of the physics of interaction of HZE particles is necessary. Since the heavy ion transport problem is a complex one, there is a need for both experimental and theoretical studies to develop accurate transport models. RIST and JAERI (Japan), GSI (Germany) and Chalmers (Sweden) are therefore currently developing and bench marking the General-Purpose Particle and Heavy-Ion Transport code System (PHITS). In this paper, we report simulations of an accelerator-based shielding experiment, in which a beam of 1 GeV/n Fe-ions has passed through thin slabs of polyethylene, Al, and Pb at an acceptance angle up to 4º.
Kobayashi, Yasuhiko; Watanabe, Hiroshi; Kikuchi, Masahiro; Narumi, Issei
Advances in Space Research, 25(10), p.2103 - 2106, 2000/00
Times Cited Count：11 Percentile：80.78(Engineering, Aerospace)no abstracts in English
