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Journal Articles

Photoneutron detection in lightning by gadolinium orthosilicate scintillators

Wada, Yuki*; Nakazawa, Kazuhiro*; Enoto, Teruaki*; Furuta, Yoshihiro; Yuasa, Takayuki*; Makishima, Kazuo*; Tsuchiya, Harufumi

Physical Review D, 101(10), p.102007_1 - 102007_6, 2020/05

 Times Cited Count:0 Percentile:100(Astronomy & Astrophysics)

Journal Articles

Improved holdup blender assay system (IBAS) slope validation measurements to improve nuclear material accountancy of high alpha holdup

LaFleur, A. M.*; Nakamura, Hironobu; Menlove, H. O.*; Mukai, Yasunobu; Swinhoe, M. T.*; Marlow, J. B.*; Kurita, Tsutomu

Proceedings of 37th ESARDA Annual Meeting (Internet), p.435 - 441, 2015/08

The IBAS (Improved Holdup Blender Assay System) system for safeguards and nuclear material accountancy (NMA) of holdup measurements is used at PCDF. The purpose of this detector is to measure the doubles rate from each glovebox in order to determine the mass of Pu holdup. In order to establish calibration curves for the IBAS detector and improve the holdup measurement methodology, JAEA conducted the IBAS calibration exercise with LANL support using MOX standards in 2010. In 2011, a cleanout exercise was performed and the results showed that the holdup removed from the glovebox had a significantly higher alpha term (alpha = 15.8 - 31.5) than the MOX standards (alpha = 0.67) used to establish the 2010 calibration curves. To further investigate these findings, JAEA conducted slope validation measurements in 2013 to confirm the validity of IBAS calibration slopes for the case of high alpha holdup. This paper describes the IBAS slope validation tests, analysis of the experimental results, and the evaluation of the need for a correction factor for the high alpha holdup. Quantifying the alpha term of the holdup in each glove box and understanding how this value changes over time is important to improving the overall NMA at PCDF. The results from this work will provide invaluable experimental data that directly supports safeguards and NMA measurements of plutonium holdup in gloveboxes.

Journal Articles

Demonstration result of sample assay system equipped alternative He-3 detectors

Nakamura, Hironobu; Mukai, Yasunobu; Tobita, Hiroshi; Nakamichi, Hideo; Ozu, Akira; Kureta, Masatoshi; Kurita, Tsutomu; Seya, Michio

Proceedings of 37th ESARDA Annual Meeting (Internet), p.45 - 53, 2015/08

JAEA conducted an R&D project to develop a new type of neutron detector using ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ ceramic scintillator (as an alternative neutron detector to He-3) with support of Japanese government. The design of the JAEAs alternative system (ASAS: Alternative Sample Assay System using ceramic scintillator tubes) refers basically to the INVS (INVentory Sample assay system) which is the passive type of neutron assay system equipped total 18 He-3 tubes and capable of measuring the small amount of Pu in the MOX powder or Pu nitrate solution in a vial for nuclear material accountancy and safeguards verification. In order to prove the alternative technology and the performance instead of He-3 detector, and to establish Pu measurement capability, JAEA developed and fabricated ASAS equipped 24 alternative ceramic scintillator tubes (which is equivalent to the same counting efficiency of INVS) and demonstrated. The demonstration activity implemented the confirmation of reproducibility about sample positioning, optimization of detector parameters, counting statistical uncertainty, stability check and figure of merit (FOM) using Cf check source and actual MOX powder in PCDF (Plutonium Conversion Development Facility). In addition, performance comparison between the current INVS and the ASAS was also implemented. In this paper, we present demonstration results with design information with Monte-Carlo simulation code (MCNP).

Journal Articles

Energetic ion transport by abrupt large-amplitude event induced by negative-ion-based neutral beam injection in the JT-60U

Ishikawa, Masao; Takechi, Manabu; Shinohara, Koji; Kusama, Yoshinori; Cheng, C. Z.*; Matsunaga, Go; Todo, Yasushi*; Gorelenkov, N. N.*; Kramer, G. J.*; Nazikian, R. M.*; et al.

Nuclear Fusion, 45(12), p.1474 - 1480, 2005/12

 Times Cited Count:35 Percentile:23.87(Physics, Fluids & Plasmas)

To investigate energetic ion transport induced by Alfven eigenmodes (AEs) the neutron emission profile measurement and the charge exchange (CX) neutral particle flux measurement by Natural Diamond Detector has been performed simultaneously in the JT-60U for the first time. The energetic ion profiles inferred from these measurements indicate that ALEs cause a radial redistribution of energetic ions of limited energy range from the core region to the outer region of the plasma in weak shear plasmas. This energy range is consistent with the resonance condition between the mode and the energetic ions. In reversed shear plasmas, reversed-shear-induced AEs (RSAEs) and their transition to TAEs as the minimum value of the safety factor decreases has been observed. Neutron measurements suggest energetic ion loss is large in the transition phase from RSAEs to TAEs.

Journal Articles

Superconducting electronics applications of metallic high-Tc substance MgB$$_{2}$$; Toward superconducting tunnel junctions and superconducting radiation detectors using thermal relaxation process

Ishida, Takekazu*; Wang, Z.*; Yotsuya, Tsutomu*; Machida, Masahiko

Kotai Butsuri, 40(1), p.51 - 67, 2005/01

no abstracts in English

JAEA Reports

Development of a position-sensitive fission counter and measurement of neutron flux distributions

Yamagishi, Hideshi; Soyama, Kazuhiko; Kakuta, Tsunemi; Ochiai, Masaaki; Iwamura, Takamichi; Saishu, Sadanori*; Urakami, Masao*; Masuda, Naohiro*; Yamauchi, Yuki*; Otani, Junichi*; et al.

JAERI-Tech 2001-053, 19 Pages, 2001/08

JAERI-Tech-2001-053.pdf:2.48MB

no abstracts in English

Journal Articles

JAEA Reports

Design of the characteristic impedance and trial manufacturing of the solenoid electrode structure for a position-sensitive fission counter

Yamagishi, Hideshi; Suzuki, Katsuo; Kakuta, Tsunemi;

JAERI-Research 98-063, 21 Pages, 1998/11

JAERI-Research-98-063.pdf:1.17MB

no abstracts in English

Journal Articles

A Report on the 12th topical conference on high temperature plasma diagnostics

Kodama, Ryosuke*; Yoshida, Hidetoshi; *; Nishitani, Takeo; Muto, Sadatsugu*; *; Matsuda, Toshiaki; *; Kawahata, Kazuo*; Isobe, Mitsutaka*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 74(10), p.1208 - 1213, 1998/10

no abstracts in English

Journal Articles

Investigation of interaction between MeV-ions and first wall from neutron and $$gamma$$-ray measurements in JT-60U

Kondoh, Takashi; Kusama, Yoshinori; Kimura, Haruyuki; Saigusa, Mikio; Fujii, Tsuneyuki; Moriyama, Shinichi; Nemoto, Masahiro; Tobita, Kenji; Morioka, Atsuhiko; Nagashima, Keisuke; et al.

Journal of Nuclear Materials, 241-243, p.564 - 568, 1997/02

 Times Cited Count:12 Percentile:29.69

no abstracts in English

Journal Articles

Development of in-core measuring method using optical techniques

Kakuta, Tsunemi; Shikama, Tatsuo*; *;

Radiation Detectors and Their Uses,Proc. of the 8th Workshop; KEK Proc. 94-7, 0, p.109 - 113, 1994/00

no abstracts in English

Journal Articles

Measurement of neutron flux in the AVR

; ; ; ; H.Brixy*; J.Oehmen*; R.Hecker*; H.-J.Hantke*

Juel-2467, 43 Pages, 1991/04

no abstracts in English

Journal Articles

Demonstration tests of the high temperature wide range neutron monitoring system in the AVR

; ; ; ; J.Oehmen*; H.Brixy*; R.Hecker*

Juel-2468, 40 Pages, 1991/04

no abstracts in English

Journal Articles

Quantitative evaluation of multiple production of neutrons induced by cosmic rays in materials

Kimura, Takaumi

Journal of Nuclear Science and Technology, 27(12), p.1147 - 1150, 1990/12

no abstracts in English

Journal Articles

Cold fusion experiments in JAERI

Kimura, Takaumi

IAERU-9002, p.87 - 111, 1990/11

no abstracts in English

Journal Articles

Neutron diagnostic for MTX

Ogawa, Toshihide; ; Hoshino, Katsumichi; Odajima, Kazuo; Maeda, Hikosuke;

Review of Scientific Instruments, 61(10), p.3181 - 3183, 1990/10

 Times Cited Count:3 Percentile:50.15(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

Journal Articles

Recent trend and progress in utilization of radioisotope neutron sources

Isotope News, (10), p.2 - 5, 1979/00

no abstracts in English

22 (Records 1-20 displayed on this page)