Application of KCl:Eu storage phosphors to wide-range neutron detection

Sakasai, Kaoru; To, Kentaro; Nakamura, Tatsuya; Takakura, Kosuke; Konno, Chikara; Iwamoto, Yosuke

Proceedings of 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC), Vol.3, p.2024 - 2030, 2013/00

https://doi.org/10.1109/NSSMIC.2013.6829655

Storage characteristics of KCl:Eu phosphor were investigated in order to apply the phosphor to wide-range neutron detection. For detection of both slow and fast neutrons, LiF powders and polyethylene powders were added to the phosphor at the same time. The optimization of the phosphor for maximum photostimulated luminescence yields have been performed and obtained at a polyethylene weight ratio of about 0.05 when the mixtures were irradiated by fast neutron with energy of 14.8 MeV, where the weight ratio of KCl:Eu phosphor to LiF powders was fixed to be two to three. These experimental results well agreed with theoretical predictions by Monte Carlo simulation using PHITS code. The energy deposition by slow or intermediate neutrons was mainly due to charged particles as a result of nuclear reaction of Li(n,)T. According to relativistic calculation, the energy of alpha particles or tritons cannot be uniquely determined in a laboratory system but has a certain distribution even if incident neutron energy is fixed when neutron energy is high. The calculation showed that charged particles produced by nuclear reactions such as K(n,) or Cl(n,), in addition to protons by H(n,n) H reaction, will contribute the total energy deposition at high energy of incident neutrons.

Optical guide property of alternative He-3 neutron detectors using solid scintillators for nuclear safeguards

Ozu, Akira; Nakamura, Tatsuya; Takase, Misao; Kurata, Noritaka; Haruyama, Mitsuo; Kureta, Masatoshi; Soyama, Kazuhiko; Seya, Michio

Proceedings of 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC), 4 Pages, 2013/00

https://doi.org/10.1109/NSSMIC.2013.6829640

Alternative He-3 neutron detectors using inorganic solid (ZnS:Ag/10BO) scintillators for nuclear safeguards have been developed in Japan Atomic Energy Agency (JAEA). The detector module is made mainly of three components: an aluminum regular square tube (32 mm 32 mm 300 mm), a rectangular scintillator sheet (39 mm 250 mm) and two PMTs. The scintillator sheet is fit on the diagonal inside the square tube, while the two PMTs are installed at both ends of the tube. At present, the detection efficiency of around 50% of that of the He-3 gas detector has been already achieved. The ray sensitivity of 510 is also obtained. The fundamental performance of the alternative detector is strongly dependent on the optical guide property of scintillation lights inside of the tube. The transport properties of the scintillation lights detected with the PMTs was evaluated by a ray-tracing simulation. The results are discussed in comparison with the experimental results.

A New method for monitoring beam range by measuring low energy photons

Yamaguchi, Mitsutaka; Torikai, Kota*; Kawachi, Naoki; Shimada, Hirofumi*; Sato, Takahiro; Nagao, Yuto; Fujimaki, Shu; Kokubun, Motohide*; Watanabe, Shin*; Takahashi, Tadayuki*; et al.

Proceedings of 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC), 2 Pages, 2013/00

https://doi.org/10.1109/NSSMIC.2013.6829328

Development of a method calculating detection efficiency maps for quantitative image reconstruction of a Compton camera

Nagao, Yuto; Yamaguchi, Mitsutaka; Kawachi, Naoki; Fujimaki, Shu; Kamiya, Tomihiro; Takeda, Shinichiro*; Watanabe, Shin*; Takahashi, Tadayuki*; Torikai, Kota*; Arakawa, Kazuo*; et al.

no journal, , 

Development of GAGG gamma camera system for high-energy photon imaging

Kawachi, Naoki; Fujimaki, Shu; Watabe, Hiroshi*; Yamamoto, Seiichi*

no journal, ,