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Tsai, P.-E.; Iwamoto, Yosuke; Hagiwara, Masayuki*; Sato, Tatsuhiko; Ogawa, Tatsuhiko; Satoh, Daiki; Abe, Shinichiro; Ito, Masatoshi*; Watabe, Hiroshi*
Proceedings of 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2017) (Internet), 3 Pages, 2018/11
The energy spectra of primary knock-on atoms (PKAs) are essential for radiation damage assessment in design of accelerator facilities. However up to date the experimental data are still limited, due to the poor mass resolution and the high measurement threshold energies in the conventional setup of nuclear physics experiments using solid state detectors, which are typically above a few MeV/nucleon. In this study, a novel detection system consisting of two time detectors and one dE-E energy detector is proposed and being constructed to measure the PKA spectra. The system and detector design was based on Monte Carlo simulations by using the PHITS code. The PHITS simulations show that the system is able to distinguish the PKA isotopes above 
0.2-0.3 MeV/nucleon for A=2030 amu; the PKA mass identification thresholds decrease to 
0.1 MeV/nucleon for PKAs lighter than 20 amu. The detection system will be tested in the summer of 2017, and the test results will be presented at the conference.
Ozu, Akira; Maeda, Makoto; Komeda, Masao; Toh, Yosuke; Koizumi, Mitsuo; Seya, Michio
Proceedings of 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2017) (Internet), 4 Pages, 2018/11
Rodriguez, D.; Rossi, F.; Seya, Michio; Koizumi, Mitsuo
Proceedings of 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2017) (Internet), 3 Pages, 2018/11
Takeuchi, Tomoaki; Otsuka, Noriaki; Watanabe, Takashi*; Tanaka, Shigeo*; Ozawa, Osamu*; Komanome, Hirohisa*; Ueno, Shunji*; Tsuchiya, Kunihiko
Proceedings of 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2017) (Internet), 3 Pages, 2018/11
no abstracts in English
Otsuka, Noriaki; Takeuchi, Tomoaki; Tsuchiya, Kunihiko; Shibagaki, Taro*; Komanome, Hirohisa*
Proceedings of 2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2017) (Internet), 3 Pages, 2018/11
no abstracts in English
Morishita, Yuki; Yamamoto, Seiichi*; Izaki, Kenji; Kaneko, Junichi*
no journal, ,
Spectroscopy of alpha particles is necessary to distinguish plutonium isotopes from radon progeny. We previously developed an alpha particle imaging detector by combining a 0.1-mm-thick GAGG scintillator with a silicon photomultiplier (SiPM). This detector had better energy resolution than the ZnS(Ag) scintillator-based alpha particle detector. However, it had 
or 
sensitivity because the GAGG scintillator was too thick compared with the range of 5.5 MeV 
particles. Therefore, it is difficult to measure alpha particles from plutonium in a field with high and background. To solve this problem, we optimized the thickness of GAGG scintillator by comparing three GAGG scintillators with thicknesses of 0.05 mm, 0.07 mm, and 0.1 mm. Each of the GAGG scintillators was optically coupled to SiPM, which was used as the photodetector. The peak channels and energy resolutions for 5.5 MeV alpha particles of three GAGG scintillators were compared. Also, the count rates of particles of the GAGG scintillators were evaluated by using a 
Sr source. The peak channel of the 0.05-mm-thick GAGG scintillator was 1.6x higher than that of the 0.1-mm-thick GAGG scintillator and 3.7x higher than that of the plastic scintillator. The 0.05-mm-thick GAGG scintillator had the best energy resolution of 11.6 % FWHM and the lowest count rate of 0.2 cpm among the three GAGG scintillators.
Morishita, Yuki; Kaneko, Junichi*; Izaki, Kenji; Yajima, Tatsuo*; Matsuura, Mitsugu*
no journal, ,
For detecting airborne contamination of 
Pu and 
Pu released by the accident, a dust monitor with a silicon surface barrier detector (SSBD) is introduced at a site of nuclear fuel facility. However, SSBD frequently produces a false alarm triggered by an electromagnetic noise generator. For high-reliable dust monitoring, we developed an particle spectrometer based on the GPS scintillator plate with PMT. Our developed spectrometer consists of a cerium doped Gd
SiO
(GPS) scintillator plate and a Photomultiplier Tube (PMT). The GPS scintillator plate was hexagonal in shape and 50 mm in diameter and a scintillator layer was approximately 40 um. An 
Am source with 5.5 MeV particle, Rn progeny collected air filter, and PuO particle were measured by developed spectrometer. The energy resolution for 5.5-MeV particles was 11.9% FWHM. The radon progeny nuclide reduction ratio (Rratio) was improved compared with ZnS(Ag) based spectrometer, so that Pu and Rn progeny can be effectively distinguished. Thus, our developed spectrometer will be high-reliable dust monitor for detecting Pu contamination.
Nakamura, Tatsuya; To, Kentaro; Tsutsui, Noriaki; Ebine, Masumi; Birumachi, Atsushi
no journal, ,
A position-sensitive scintillation detector module for a new protein neutron diffractometer was developed by using a scintillator / wavelength shifting (WLS) fiber technology. The detector module has a spatial resolution of 2.5 mm with a neutron-sensitive area of 320 
320 mm
. The WLS fibers are arranged in a regular pitch of 2.5 mm in x and y direction and those arrays are placed diagonally. The light reflecting grid is inserted in between the fibers in order for optical isolation and for mechanical support of the fiber. The detector implemented flat 
Li/ZnS screens up and downstream of the WLF fiber arrays. The detector exhibited a detection efficiency of 30-50% for thermal neutron (depending on -ray sensitivities) and a count uniformity of ~13%. In this paper detailed detector design and experimental results obtained using a pulsed neutron beam are presented.
Sato, Yuki; Terasaka, Yuta; Kaburagi, Masaaki; Tanifuji, Yuta; Usami, Hiroshi; Miyamura, Hiroko; Ozawa, Shingo*; Izumi, Ryo*; Kawabata, Kuniaki; Suzuki, Toshikazu*; et al.
no journal, ,
NID) with boron converter for energy-resolved neutron imaging at J-PARCParker, J. D.*; Shinohara, Takenao; Harada, Masahide; Hayashida, Hirotoshi*; Hiroi, Kosuke; Kai, Tetsuya; Matsumoto, Yoshihiro*; Oikawa, Kenichi; Segawa, Mariko; Su, Y. H.; et al.
no journal, ,
