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Sato, Tatsuhiko; Niita, Koji*; Shurshakov, V. A.*; Yarmanova, E. N.*; Nikolaev, I. V.*; Iwase, Hiroshi*; Sihver, L.*; Mancusi, D.*; Endo, Akira; Matsuda, Norihiro; et al.
Cosmic Research, 49(4), p.319 - 324, 2011/08
Times Cited Count：11 Percentile：60.36(Engineering, Aerospace)HZE particle transport codes are the indispensable tool in the shielding design of spacecrafts. We are therefore developing a general-purpose Monte Carlo code PHITS, which can deal with the transports of all kinds of hadrons and heavy ions with energies up to 200 GeV/n in 3-dimensional phase spaces. The applicability of PHITS to space researches has been well verified by comparing the neutron spectra in spacecrafts calculated by the code with the corresponding experimental data. Recently, PHITS was employed in the estimation of radiation fields in the Russian Service Module in ISS. The results of the estimation indicate that PHITS can reproduce experimental data of the dose reduction rates due to water shielding attached on the wall of the Russian crew cabin fairly well. The details of the calculation procedures will be given in the presentation, together with the results of other applications of PHITS to the space exploration.
Arai, Shigeki; Chatake, Toshiyuki; Suzuki, Nobuhiro*; Mizuno, Hiroshi*; Niimura, Nobuo
Acta Crystallographica Section D, 60(6), p.1032 - 1039, 2004/06
Times Cited Count：17 Percentile：76.04(Biochemical Research Methods)The parameters used for evaluating biomacromolecular crystal quality (
, 
/
(), maximum resolution and mosaicity) strongly depend on the diffraction experimental conditions. In this paper we describe the distinctive features of the relative Wilson plot method, and we show that the overall B-factor obtained from this plot is given as a more appropriate to characterize protein crystals. The relative Wilson plot has been applied to the characterization of crystals of a B-DNA decamer d(CCATTAATGG), and crystals of the proteins DsrD (dissimilatory sulfite reductase D) and hen egg-white lysozyme (HEWL) which we have studied by neutron diffraction. We have found that the crystal qualities of the B-DNA decamer and DsrD significantly depend on the regions of the crystallization phase diagram from which samples were taken. However, in the case of HEWL, crystal quality appears to be independent on the region of the crystallization phase diagram.
Yasuda, Hiroshi*; Takada, Masashi*; Sato, Tatsuhiko; Nakamura, Takashi*
no journal, ,
Although it is important to know the precise energy spectra of neutrons for radiological protection of astronauts, measurement of energetic neutrons (
10MeV) in a spacecraft is still difficult because signals from neutrons are weak and mixed with those from charged particles such as protons and heavy ions. We thus try to develop a new, maintenance-free detector which can automatically measure energetic cosmic neutrons in the high-energy range (500MeV) separately from other radiation components. For testing the feasibility of our concept, experiments for cosmic radiation measurement were performed at high altitude (28,500ft) in a jet aircraft by using several detectors.
Sato, Tatsuhiko; Yasuda, Hiroshi*; Takada, Masashi*; Nakamura, Takashi*
no journal, ,
no abstracts in English
