JOPSS - Search Results

Journal Articles

Application of neutron imaging plate and neutron CT methods on nuclear fuels and materials

Yasuda, Ryo; Matsubayashi, Masahito; Nakata, Masahito; Harada, Katsuya; Amano, Hidetoshi; Sasajima, Fumio; Nishi, Masahiro; Horiguchi, Yoji

IEEE Transactions on Nuclear Science, 52(1), p.313 - 316, 2005/02

https://doi.org/10.1109/TNS.2005.844297

Times Cited Count：14 Percentile：67.84(Engineering, Electrical & Electronic)

Neutron radiography is useful to inspect macroscopic change in nuclear fuels before and after irradiation. We have been investigated the practicality of neutron imaging plate and neutron CT methods for the inspection of the spent fuels. A fresh UO2 fuel rod was examined by those methods. The test results of those samples are available to develop the system of those methods for the spent fuels and to determine the specifications of the system. Some good images of those samples are obtained by those examinations. The shape of the pellets in the fuel rod is clearly recognized in the image. Those images are analyzed to estimate the size of some parts in the fuel pellets.

Journal Articles

Application of hydrogen analysis by neutron imaging plate method to Zircaloy cladding tubes

Yasuda, Ryo; Nakata, Masahito; Matsubayashi, Masahito; Harada, Katsuya; Hatakeyama, Yuichi; Amano, Hidetoshi

Journal of Nuclear Materials, 320(3), p.223 - 230, 2003/08

https://doi.org/10.1016/S0022-3115(03)00112-0

Times Cited Count：15 Percentile：69.06(Materials Science, Multidisciplinary)

Neutron radiography is one of effective tools to determine hydrided region in Zircaloy cladding tubes. In this work, the practicability of the neutron radiography for hydrogen analysis is further investigated by using standard samples with known hydrogen concentration. Local hydrogen concentration in hydrided Zircaloy tube is quantitatively estimated using the standard samples by neutron imaging plate (NIP) method. The local area is equivalent to a picture element in the image; e.g., 0.1mm0.1mm. In addition, contribution of an oxide film in the tubes to the images is investigated using oxidized samples with hydrides or no hydride. In NIP images of oxidized tube no oxide film was recognized. Numerical image analysis also shows no effect of the oxide film on the image. These results show that the influence of oxygen on image contrast can be neglected when hydrogen analysis is performed on the Zircaloy tube with oxide film and hydrides by NIP method.

Journal Articles

Optimization of neutron imaging plate

Haga, Yuko*; Neriishi, Keiko*; Takahashi, K.*; Niimura, Nobuo

Nuclear Instruments and Methods in Physics Research A, 487(3), p.504 - 510, 2002/07

https://doi.org/10.1016/S0168-9002(01)02204-5

Times Cited Count：9 Percentile：51.46(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

Development of advanced neutron radiography for inspection on irradiated fuels and materials, 3; Examination of neutron imaging plate and computed tomography methods on unirradiated fuel rod

Yasuda, Ryo; Matsubayashi, Masahito; Nakata, Masahito; Harada, Katsuya; Amano, Hidetoshi; Ando, Hitoshi*; Sasajima, Fumio; Nishi, Masahiro; Horiguchi, Yoji

JAERI-Tech 2002-001, 23 Pages, 2002/02

JAERI-Tech-2002-001.pdf:3.79MB

Advanced neutron radiography techniques such as neutron imaging plate (NIP) and Computed Tomography (CT) methods have been investigated the practicality for Post Irradiation Examination (PIE). In this work, an unirradiated fuel rod was examined by NIP and CT methods in order to collect the fundamental data for applying these techniques to PIE.The fuel rod is composed of seven-enriched UO2 pellet and two-natural UO2 pellet that are loaded into a Zircaloy tube. There are somewhat difference in the size and shape among those UO2 pellets. A transmitted and cross-sectional images were obtained by NIP and CT methods, respectively.In the NIP image, the difference in the size, shape, and enrichment among the UO2 pellets is obviously recognized. In the case of CT method, the images clearly show the detailed shape of the cross section in the pellets, in addition, the difference in the enrichment between the natural and enriched pellets is recognized.

Journal Articles

Neutron diffractometer for biological crystallography-3; BIX-3

Tanaka, Ichiro; Kurihara, Kazuo; Chatake, Toshiyuki; Niimura, Nobuo

Journal of the Physical Society of Japan, Vol.70, Supplement A, p.459 - 461, 2001/05

no abstracts in English

Journal Articles

Neutron crystallography of hen egg-white lysozyme at pH4.9

Maeda, Mitsuru; Fujiwara, Satoru; Yonezawa, Yasushige*; Niimura, Nobuo

Journal of the Physical Society of Japan, Vol.70, Supplement A, p.403 - 405, 2001/05

no abstracts in English

Journal Articles

Neutron stress measurement using neutron image plate, 3

Sasaki, Toshihiko*; Minakawa, Nobuaki; Morii, Yukio; Niimura, Nobuo; Hirose, Yukio*

Nihon Zairyo Gakkai Dai-36-Kai X Sen Zairyo Kyodo Ni Kansuru Shimpojiumu Koen Rombunshu, p.259 - 262, 2000/09

no abstracts in English

Journal Articles

Performance of a multi-wavelength monochromator system for neutron single-crystal and powder diffraction

Ahmed, F. U.*; Tanaka, Ichiro; Niimura, Nobuo

Journal of Applied Crystallography, 33(Part.2), p.291 - 295, 2000/04

In order to improve significantly data collection efficiency, the advantages of using multi-wavelengths in single-crystal neutron diffraction as well as in powder neutron diffraction were established by experiments using a stacked monochromator assembly of two elastically bent perfect Si(111) and Si(220) crystals. The TAS-2 spectrometer on JRR-3M at JAERI was employed for these experiments. Each crystal was elastically bent in order to increase the flux density at the sample position. Two wavelengths, 1=1.80 for Si(220) and 2=2.94 for Si(111), were selected. With the neutron imaging plate (NIP) detector, it was possible to aquire multiple reflections simultaneously with better intensity, better statistics and higher spatial resolution with an open geometry. As a single crystal sample an organic compound piperidine cobaloxime was used. For the systems investigated in this study, it was possible to assign unambiguously rings or spots to diffraction by 1 or by 2 in the case of powder and single-crystal diffraction on the NIP.