Neutron transmission CB-KID imager using samples placed at room temperature

Ishida, Takekazu*; Vu, TheDang*; Shishido, Hiroaki*; Aizawa, Kazuya; Oku, Takayuki; Oikawa, Kenichi; Harada, Masahide; Kojima, Kenji M*; Miyajima, Shigeyuki*; Koyama, Tomio*; et al.

Journal of Low Temperature Physics, 214(3-4), p.152 - 157, 2024/02

https://doi.org/10.1007/s10909-023-03030-9

High spatial resolution neutron transmission imaging using a superconducting two-dimensional detector

Shishido, Hiroaki*; Nishimura, Kazuma*; Vu, TheDang*; Aizawa, Kazuya; Kojima, Kenji M*; Koyama, Tomio*; Oikawa, Kenichi; Harada, Masahide; Oku, Takayuki; Soyama, Kazuhiko; et al.

IEEE Transactions on Applied Superconductivity, 31(9), p.2400505_1 - 2400505_5, 2021/12

https://doi.org/10.1109/TASC.2021.3111396

In this study, we employed a superconducting detector, current-biased kinetic-inductance detector (CB-KID) for neutron imaging using a pulsed neutron source. We employed the delay-line method, and high spatial resolution imaging with only four reading channels was achieved. We also performed wavelength-resolved neutron imaging by the time-of-flight method. We obtained the neutron transmission images of a Gd-Al alloy sample, inside which single crystals of GdAl were grown, using the delay-line CB-KID. Single crystals were well imaged, in both shapes and distributions, throughout the Al-Gd alloy. We identified Gd nuclei via neutron transmissions that exhibited characteristic suppression above the neutron wavelength of 0.03 nm. In addition, the Gd resonance dip, a dip structure of the transmission caused by the nuclear reaction between an isotope and neutrons, was observed even when the number of events was summed over a limited area of 15 m 12 m. Gd selective imaging was performed using the resonance dip of Gd, and it showed clear Gd distribution even with a limited neutron wavelength range of 1 pm.

Development of fireproof sheet on glove box panels

Kawasaki, Kohei; Shinada, Kenta; Okamoto, Naritoshi; Kageyama, Tomio; Eda, Takashi; Okazaki, Hiro; Suzuki, Hiromichi; Yamamoto, Kazuya; Otabe, Jun

JAEA-Technology 2020-025, 80 Pages, 2021/03

JAEA-Technology-2020-025.pdf:3.72MB

Plutonium Fuel Production Facility was built in 1988 for the purpose of mainly producing MOX fuel of the prototype fast breeder reactor MONJU, and large glove boxes were installed for handling unsealed nuclear fuel material remotely. The panels of these glove boxes are made of acrylic, except for those installed after December 2013. For fires inside the glove box, automatic fire extinguishing systems using halides have been introduced since the beginning of construction, but for fires outside the glove box, there have been issues with direct measures for acrylic. Therefore, we have developed a fireproof sheet that mitigates the effect of fire outside the glove box on the panels as much as possible. As a result, fire-retardant sheets have been selected and attached to the glove box panels. We conducted a flammability test of the acrylic plate attached with these fireproof sheets and a usage environment influence test of fireproof sheets, and obtained good results. In addition, we set up a working group in the Plutonium Fuel Development Center in view of reducing external exposure during the work of attaching fireproof sheets, in which we discussed and examined the work procedure, and summarized it in the basic procedure manual.

Energy-resolved neutron imaging using a delay line current-biased kinetic-inductance detector

Shishido, Hiroaki*; Nishimura, Kazuma*; Vu, TheDang*; Kojima, Kenji M*; Koyama, Tomio*; Oikawa, Kenichi; Harada, Masahide; Miyajima, Shigeyuki*; Hidaka, Mutsuo*; Oku, Takayuki; et al.

Journal of Physics; Conference Series, 1590, p.012033_1 - 012033_8, 2020/10

https://doi.org/10.1088/1742-6596/1590/1/012033

Clearance of concrete generated from modification activities of JRR-3; Results for measuring and evaluating radioactivity concentration

Ogoshi, Yurie; Satoyama, Tomonori; Kishimoto, Katsumi; Nanri, Tomohiro; Suzuki, Takeshi; Tomioka, Osamu; Takaizumi, Hirohide*; Kanno, Tomoyuki*; Maruyama, Tatsuya*

JAEA-Technology 2017-017, 152 Pages, 2017/08

JAEA-Technology-2017-017.pdf:15.97MB

At Nuclear Science Research Institute, clearance works for about 4,000 tons of extremely low-level radioactive concrete debris, which were generated from the modification activities of JRR-3 from FY 1985 to FY 1989 and stored in the waste storage facility NL, carried out. First of this clearance works, method for measuring and evaluating radioactivity concentration was approved by Minister of MEXT on July 25, 2008. And then, clearance works were started from FY 2009. Measuring and evaluating radioactivity concentration was achieved by using the approved method, and was confirmed by government. And then, clearance works were completed in FY 2014. The clearance concrete was recycled as a material for restoration works of the 2011 off the Pacific coast of Tohoku Earthquake. This report summarizes the results of measuring and evaluating radioactivity concentration, achievement of confirmation by government, recycling of cleared concrete and cost for clearance works.

Bibliometric study of radiation application on microdose useful for new drug development

Komoda, Fumio*; Suzuki, Akiko*; Yanagisawa, Kazuaki; Inoue, Tomio*

Annals of Nuclear Medicine, 23(10), p.829 - 841, 2009/12

https://doi.org/10.1007/s12149-009-0311-z

The number of newly approved medicines for market decreased because of the great disparity between animal model in pre-clinical trial and human model in clinical trial. This bottleneck may be expected to be gotten rid of by change in paradigm of drug development based on microdosing, which is enabled by radiation related imaging technology. However, this is impossible without being accompanied by interdisciplinary joint researches, in which clinical investigators belonging to medical schools or hospitals play the most decisive role. In this article, authors verify based on bibliometrics that Japan has not employed the opportunity for revitalizing drug research activities because Japanese researchers' attitude towards radiation technology may not be so positive in comparison with the US, and because the role which clinical investigators play in the phase of pre-clinical trial is smaller in Japan than in the U.S.A..

Optimization of JK2LB chemical component for ITER central solenoid jacket material

Hamada, Kazuya; Nakajima, Hideo; Kawano, Katsumi; Takano, Katsutoshi; Tsutsumi, Fumiaki; Okuno, Kiyoshi; Suzuki, Tomio; Fujitsuna, Nobuyuki*

Teion Kogaku, 41(3), p.131 - 138, 2006/03

https://doi.org/10.2221/jcsj.41.131

no abstracts in English

Present status; Collaboration between NBL and JAEA on preparation of Pu reference material

Sumi, Mika; Kageyama, Tomio; Suzuki, Toru; Manson, P.*; Neuhoff, J.*

Proceedings of INMM 47th Annual Meeting (CD-ROM), 7 Pages, 2006/00

All accountancy analyses at the Plutonium Fuel Development Center (PFDC) of JAEA are performed by isotope dilution mass spectrometry (IDMS) with well-characterized standard materials, which prepared at PFDC itself from Pu and U reference materials. Currently, Pu reference materials must be obtained from foreign suppliers because there are no facilities in Japan with the capability for preparation and supply of Pu reference materials, and, importing those Pu reference materials is gradually becoming more difficult. Therefore, JAEA has started collaborative work with NBL for the preparation of Pu reference materials and associated Large Size Dried (LSD) spike. MOX powder which has been stored in JAEA was dissolved and ion-exchange was performed to obtain purified Pu solution at JAEA. Several aliquots had taken from the solution, dried, and sent to NBL for analysis. Pu samples were shipped and have arrived to NBL. After certification analysis on NBL, the Pu nitrate solution will be mixed with a U nitrate solution which prepared from CRMs. The uncertainty of the purified Pu solution and prepared LSD spikes will be evaluated by GUM method. This paper presents the present status and future plans for the collaboration work.

High temperature tensile properties of metallic materials exposed to a sulfuric acid decomposition gas environment

Kurata, Yuji; Tachibana, Katsumi; Suzuki, Tomio

Nihon Kinzoku Gakkai-Shi, 65(4), p.262 - 265, 2001/04

no abstracts in English

High temperature corrosion of iron-base and nickel-base alloys for hydrogen production apparatus by thermochemical method in HO+SO atmosphere

Kurata, Yuji; Suzuki, Tomio; Shimizu, Saburo

JAERI-Research 2000-011, p.56 - 0, 2000/03

JAERI-Research-2000-011.pdf:14.24MB

no abstracts in English