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Masukawa, Fumihiro; Sato, Tatsuhiko; Sato, Koichi; Moriyasu, Hiroyuki; Nakazawa, Takashi; Miyamoto, Yukihiro; Nakashima, Hiroshi
Progress in Nuclear Science and Technology (Internet), 3, p.76 - 78, 2012/10
In high energy particle accelerator facilities, high energy neutron contribution to dose is the most interest as it has significant contribution to total dose, thus it determines the shielding design. Neutron dose rate were measured at Materials and Life Science Facility (MLF) of J-PARC, by two types of active detectors which can be applied in high energy neutron field: one is the modified type of ordinary rem meter, 
He propotional counter with polyethylene moderator added lead to improve high energy response, the other is the phoswitch-type scintillation detector, which consists of liquid organic scintillator BC501A coupled with ZnS(Ag) scintillation sheets doped with 
Li, developed as DARWIN (Dose monitoring system Applicable to various Radiations with WIde energy raNges) in JAEA. Neutron dose rate was measured on the pre-shield of the neutron beam line No.12 (BL12), which is located in the experimental hall No.1. The neutron dose rate by the modified rem meter was 
50 
Sv/h at the wall on 3 GeV-220 kW operation. Alhough the mercury target is well shielded to reduce the background radiation to the neutron experimental halls, such dose rate was observed as high energy neutrons from upstream beam loss caused by the muon target penetrate through proton beam tunnel. Neutron spectrum was also measured by DARWIN, showed that the high energy neutrons over 20 MeV have comparable contribution by those of 1 20 MeV.
Nakashima, Hiroshi; Sakamoto, Yukio; Iwamoto, Yosuke; Matsuda, Norihiro; Kasugai, Yoshimi; Nakane, Yoshihiro; Masukawa, Fumihiro; Mokhov, N.*; Leveling, A.*; Boehnlein, D.*; et al.
Nuclear Technology, 168(2), p.482 - 486, 2009/11
Times Cited Count：7 Percentile：43.22(Nuclear Science & Technology)Experimental studies of shielding and radiation effects have been started using 120-GeV proton synchrotron at Fermi National Accelerator Laboratory (FNAL) under collaboration between FNAL and Japan. The first campaign of the experiment was carried out at the Pbar target station and Numi experimental station at FNAL, using antiproton and neutrino production targets irradiated by 120-GeV protons. The generated secondary particles passing through steel, concrete and rock were measured by activation methods as well as by other detectors such as scintillator with a veto counter, phoswich detector and a Bonner ball counter on trial. Preliminary experimental results are presented.
Masukawa, Fumihiro; Abe, Teruo*; Hayashi, Katsumi*; Handa, Hiroyuki*; Nakashima, Hiroshi
JAEA-Data/Code 2006-024, 98 Pages, 2006/11
JAEA-Data-Code-2006-024.pdf:7.9MB
We have developed SHINE3, simple code for high energy neutron skyshine dose evaluation, for the shielding designs of high energy accelerator facilities. This code uses the 4-parametric fitting function to the skyshine dose response by neutron and secondary 
-ray, which were predicted by PHITS, the general-purpose Particle and Heavy Ion Transport Monte Carlo code system. This code can be applied for skyshine dose evaluation of neutron up to 3 GeV in energy, and distance ranging between 10 and 2000 meters from source point, with equivalent accuracy as those by Monte Carlo Method.
Nakano, Hideo*; Masukawa, Fumihiro; Nakashima, Hiroshi; Sasamoto, Nobuo*; Tayama, Ryuichi*; Handa, Hiroyuki*; Hayashi, Katsumi*
Journal of Nuclear Science and Technology, 41(Suppl.4), p.50 - 53, 2004/03
In order to estimate accuracy of the various calculation methods for the neutron streaming through a maze and duct in proton accelerator facilities, we performed benchmark analyses by using the radiation shielding design codes. According to the results of the benchmark analyses, it is concluded that NMTC/MCNP, MCNPX and DUCT-III are applicable to actual calculation of the duct-streaming radiations for J-PARC.
Masukawa, Fumihiro; Nakano, Hideo*; Nakashima, Hiroshi; Sasamoto, Nobuo; Tayama, Ryuichi*; Handa, Hiroyuki*; Hayashi, Katsumi*; Hirayama, Hideo*; Shin, Kazuo*
JAERI-Tech 2003-018, 42 Pages, 2003/03
no abstracts in English
Masukawa, Fumihiro; Sakamoto, Yukio;
Proc., 1996 Topical Meeting on Radiation Protection and Shielding, 1, p.432 - 439, 1996/00
no abstracts in English
; Onodera, Emi*; Masukawa, Fumihiro; Naito, Yoshitaka; Imawaka, Tsuneyuki*; Yoda, Yoshihisa*
JAERI-M 93-128, 50 Pages, 1993/07
no abstracts in English
,n) reaction and spontaneous fissionMatsunobu, Hiroyuki*; Oku, Takeshi*; Iijima, Shungo*; Naito, Yoshitaka; Masukawa, Fumihiro; Nakashima, Ryuzo*
JAERI 1324, 260 Pages, 1992/01
no abstracts in English
Nakashima, Hiroshi; Shibata, Tokushi; Sawahata, Kei; Miyamoto, Yukihiro; Nakane, Yoshihiro; Masukawa, Fumihiro; Seki, Kazunari; Sato, Koichi; Oguri, Tomomi*; Hirayama, Hideo*; et al.
no journal, ,
Aiming at studies on the latest basic science and the advancing nuclear technology, the J-PARC (Japan Proton Accelerator Research Complex) project is in progress, and the high-energy proton accelerator complex of the world highest intensity is under construction. Because of its very high beam power and its energy as well as the large-scale accelerator complex, we have encountered some difficult radiation problems in the radiation safety design. This paper reviews the radiation safety policy and methods for the design to overcome the problems on the radiation safety and the status of the radiation safety estimation for licensing of J-PARC.
Saito, Fumihiro; Masukawa, Fumihiro; Seki, Kazunari; Kasugai, Yoshimi; Miyamoto, Yukihiro
no journal, ,
no abstracts in English
Sato, Tatsuhiko; Satoh, Daiki; Endo, Akira; Hagiwara, Masayuki*; Masukawa, Fumihiro; Nakashima, Hiroshi
no journal, ,
Radiation doses were measured in J-PARC facilities using DARWIN. The results will be presented at the meeting.
Masukawa, Yuki*; Kataoka, Takahiro*; Shuto, Hina*; Naoe, Shota*; Yano, Junki*; Kanzaki, Norie; Sakoda, Akihiro; Tanaka, Hiroshi; Hanamoto, Katsumi*; Mitsunobu, Fumihiro*; et al.
no journal, ,
no abstracts in English
