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Journal Articles

Measurements of neutronic characteristics of rectangular and cylindrical coupled hydrogen moderators

Kai, Tetsuya; Kamiyama, Takashi*; Hiraga, Fujio*; Oi, Motoki; Hirota, Katsuya*; Kiyanagi, Yoshiaki*

Journal of Nuclear Science and Technology, 55(3), p.283 - 289, 2018/03

 Percentile:100(Nuclear Science & Technology)

Journal Articles

Development of dose monitoring system applicable to various radiations with wide energy ranges

Sato, Tatsuhiko; Satoh, Daiki; Endo, Akira; Yamaguchi, Yasuhiro

Journal of Nuclear Science and Technology, 42(9), p.768 - 778, 2005/09

 Times Cited Count:16 Percentile:22.81(Nuclear Science & Technology)

A new inventive radiation monitor, designated to DARWIN (Dose Assessment system applicable to various Radiations with WIde energy raNges), has been developed for monitoring doses at workspaces of high energy accelerator facilities and on ground. Characteristics of DARWIN were studied by both calculation and experiment. The calculated results indicate that DARWIN gives reasonable estimations of doses at most radiation fields. It was found from the experiment that DARWIN has an excellent property of measuring doses from all particles that significantly contribute to the background dose - photon, muon and neutron with wide energy ranges.

Journal Articles

CsI(Tl)/Plastic phoswich detector enhanced in low-energy $$gamma$$-ray detection

Yamasoto, Kotaro; Tsutsumi, Masahiro; Oishi, Tetsuya*; Yoshizawa, Michio; Yoshida, Makoto

Nuclear Instruments and Methods in Physics Research A, 550(3), p.609 - 615, 2005/09

 Times Cited Count:3 Percentile:67.05(Instruments & Instrumentation)

A phoswich detector composed of a thin plate CsI(Tl) scintillator and a plastic scintillator (BC-400) has been designed and evaluated to improve the sensitivity in the low-energy region of large-area plastic scintillation detector. Applicability of the CsI(Tl)/Plastic phoswich detector was examined on radioactivity measurement of massive and large-area materials. The rise-time discrimination technique was applied in order to further improve the minimum detectable activity in the low-energy region. On the basis of the estimation of minimum detectable activity, it was made clear that the energy range of large-area plastic scintillation detector can be expanded down to a few tens of keV by adding a thin plate CsI(Tl) scintillator.

Journal Articles

Coupled hydrogen moderator optimization with ortho/para hydrogen ratio

Kai, Tetsuya; Harada, Masahide; Teshigawara, Makoto; Watanabe, Noboru; Ikeda, Yujiro

Nuclear Instruments and Methods in Physics Research A, 523(3), p.398 - 414, 2004/05

 Times Cited Count:29 Percentile:10.63(Instruments & Instrumentation)

Neutronic performance of a coupled hydrogen moderator was studied as a function of para hydrogen concentration, moderator thickness, height and premoderator thickness. It was found that a thick (120$$sim$$140mm) moderator with 100% para hydrogen was optimal to provide the highest time- and energy- integrated neutron intensity below 15 meV together with the highetst possible pulse-peak intensity. Low-energy neutron distribution on the moderator viewed surface was found to exhibit an intensity-enhanced region at a picture frame part near premoderator. The rather peculiar distribution suggested that the moderator and the viewed surface must be designed so as to take the brighter region near premoderator in use.

Journal Articles

High power transient characteristics and capability of NSRR

Nakamura, Takehiko; Katanishi, Shoji; Kashima, Yoichi; Yachi, Shigeyasu; Yoshinaga, Makio; Terakado, Yoshibumi

Journal of Nuclear Science and Technology, 39(3), p.264 - 272, 2002/03

 Times Cited Count:5 Percentile:61.28(Nuclear Science & Technology)

In order to study fuel behavior under abnormal transients and accidents, the control system of the Nuclear Safety Research Reactor (NSRR) of the Japan Atomic Energy Research Institute (JAERI) was modified to achieve high power transients. With this new operational mode, called Shaped Pulse (SP), transients at the maximum power of 10 MW can be conducted for a few seconds. This new operational mode supplements the previous Natural Pulse (NP) operation at the maximum power of 23 GW for milliseconds. For high power transient operation, a simulator using a point kinetic model was developed, and characteristics of the NSRR in the new operational mode were examined through tests and calculations. With the new operational mode, new types of fuel irradiation tests simulating power oscillations of boiling water reactors (BWRs) can to be conducted in the NSRR. Reactor characteristics and capability, such as control rod worth, feedback reactivity, and operational limits of the NSRR for SP operations are discussed.

Journal Articles

Optimization of coupled hydrogen moderator for a short pulse spallation source

Kai, Tetsuya; Teshigawara, Makoto; Watanabe, Noboru; Harada, Masahide; Sakata, Hideaki*; Ikeda, Yujiro

Journal of Nuclear Science and Technology, 39(2), p.120 - 128, 2002/02

 Times Cited Count:9 Percentile:43.26(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Neutronics study on the JAERI 5MW spallation neutron source; Neutronic performance of the reference target-moderator-reflector system and the target shape/size effects

Teshigawara, Makoto*; Watanabe, Noboru*; Takada, Hiroshi; Kai, Tetsuya; Nakashima, Hiroshi; *; Oyama, Yukio; Ikeda, Yujiro; Kosako, Kazuaki*

JAERI-Research 99-020, 33 Pages, 1999/03

JAERI-Research-99-020.pdf:1.83MB

no abstracts in English

JAEA Reports

Pulse shape measurements of scintillation emission

; ; Asano, Yoshihiro; Usuda, Shigekazu

JAERI-Tech 98-043, 27 Pages, 1998/09

JAERI-Tech-98-043.pdf:1.05MB

no abstracts in English

Journal Articles

Phoswich detectors for flow monitoring of actinide solutions with simultaneous $$alpha$$ and $$beta$$($$gamma$$) counting

Usuda, Shigekazu; Abe, Hitoshi

Journal of Nuclear Science and Technology, 31(1), p.73 - 79, 1994/01

 Times Cited Count:14 Percentile:22.64(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Simultaneous counting of $$alpha$$,$$beta$$ and $$gamma$$ rays with phoswich detectors

Usuda, Shigekazu; Abe, Hitoshi; Mihara, Akira

Journal of Alloys and Compounds, 213-214, p.437 - 439, 1994/00

 Times Cited Count:9 Percentile:38.43

no abstracts in English

Journal Articles

Phoswich detectors combining doubly or triply ZnS(Ag), NE102A, BGO and/or NaI(Tl) scintillators for simultaneous counting of $$alpha$$, $$beta$$ and $$gamma$$ rays

Usuda, Shigekazu; Abe, Hitoshi; Mihara, Akira

Nuclear Instruments and Methods in Physics Research A, 340, p.540 - 545, 1994/00

 Times Cited Count:21 Percentile:14.15

no abstracts in English

Journal Articles

Development of ZnS(Ag)/NE102A and ZnS(Ag)/stilbene phoswich detectors for simultaneous $$alpha$$ and $$beta$$($$gamma$$) counting

Usuda, Shigekazu

Journal of Nuclear Science and Technology, 29(9), p.927 - 929, 1992/09

no abstracts in English

Journal Articles

Flow monitor for actinide solutions by simultaneous $$alpha$$ and $$beta$$($$gamma$$) counting using a CsI(T1) scintillator

Usuda, Shigekazu; Abe, Hitoshi

Nuclear Instruments and Methods in Physics Research A, 321, p.242 - 246, 1992/00

 Times Cited Count:16 Percentile:18.23

no abstracts in English

Journal Articles

Rise time spectra of $$alpha$$ and $$beta$$($$gamma$$) rays from solid and solution sources with several solid scintillators

Usuda, Shigekazu; Mihara, Akira; Abe, Hitoshi

Nuclear Instruments and Methods in Physics Research A, 321, p.247 - 253, 1992/00

 Times Cited Count:17 Percentile:16.87

no abstracts in English

Journal Articles

A Small spherical NE213 scintillation detector for use in N-assembly fast neutron spectrum measurement

; ; ; ;

Nuclear Instruments and Methods in Physics Research A, 256, p.333 - 338, 1987/00

 Times Cited Count:21 Percentile:11.6

no abstracts in English

Journal Articles

A Digital pulse-shape discriminating unit for neutron-gamma discrimination with NE-213

;

IEEE Transactions on Nuclear Science, NS-31(1), p.451 - 454, 1984/00

no abstracts in English

JAEA Reports

Journal Articles

Proton-recoil counter technique for measurement of fast neutron spectrum

; ;

Journal of Nuclear Science and Technology, 16(5), p.329 - 343, 1979/05

 Times Cited Count:2

no abstracts in English

Journal Articles

New Types of the Pulse-shape Discriminating Circuit

;

International Symposium on Nuclear Electronics,Versailles, 54(1), p.1 - 15, 1970/00

no abstracts in English

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