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Journal Articles

Journal Articles

The Investigation and consideration for introduction of surface contamination evaluation method based on JIS

Usui, Toshihide; Takashima, Hideki; Iwasa, Atsutoshi; Hamazaki, Masaaki

Proceedings of 3rd Asian and Oceanic Congress on Radiation Protection (AOCRP-3) (CD-ROM), 3 Pages, 2010/05

JAEA Reports

Measurement of $$^{237}$$Np Fission Cross Section at YAYOI

Oki, Shigeo; Takashima, Hideki; Wakabayashi, Toshio; Yamaguchi, Kenji*; Yamawaki, Michio*

JNC TY9400 2004-005, 36 Pages, 2004/05

JNC-TY9400-2004-005.pdf:1.01MB

In the framework of the study on transmutation of minor actinide (MA) nuclides with fast reactors, the fission cross section ratio of 237Np relative to 235U has been measured by using a back-to-back (BTB) fission chamber at YAYOI fast neutron source reactor. The compact BTB fission chamber was prepared for the measurements in the experimental holes called Glory hole and Grazing hole passing though the core center and the side blanket of YAYOI, respectively. Dependence of fission cross section ratios on neutron spectrum was investigated by changing the measurement position in these experimental holes.The measured values of fission cross section ratios were compared with those calculated with the following nuclear data libraries: JENDL-3.2, ENDF/B-VI, JEF-2.2, and JENDL-2. It was found that the calculated values in the center of the core systematically overestimated the measurements by about 30%. Dispersion of the calculated values among the nuclear data libraries was smaller than the above difference from the measured value. We also see the dependence of C/E value on the measurement position. It is hardly said that uncertainty of nuclear data brings about the above overestimation of 30%.The present result remained some issues in terms of the measurement accuracy. If we can get rid of those causes, for example, by means of the unfolding technique on pulse height distribution, the result could be utilized as expletive information in nuclear data validation not only for 237Np, but also for 235U and 238U which characterize the neutron spectrum.

Journal Articles

None

Yoshikawa, Hideki; Ikeda, Yasuhisa*; Takashima, Yoichi*; *

MRS '94, 134, , 

None

Oral presentation

Study of radiation control method for Am- MOX fuel producing facility, 2; By analysis of nuclide composition ratio etc.

Takashima, Hideki; Iwasa, Atsutoshi; Eguchi, Kazutoshi; Yoshimochi, Hiroshi; Obayashi, Hiroshi; Emori, Shuichi

no journal, , 

In Alpha-$$gamma$$ Facility (AGF),Japan Atomic Energy Agency Oarai, the situation of the existing nuclide composition ratio etc. has changed greatly by manufacturing of the Am content mixed oxide fuel and executing the characteristic test. Therefore, the nuclide composition ratio etc. concerned were measuring analyzed, and the radiation management method in the emergency was examined as a result. As for the analysis sample, it gathered in the cell and the glove box (17 places) in facility, and the nuclide composition ratio was evaluated from the measurement result of the mass spectrometry etc. As a result, the nuclide composition approximated to the MA fuel pellet was seen of many sample and the difference was seen in the nuclide composition of each sample (especially, Am-241, Pu-239, and Pu-240). The result of the radiation management method in the emergency becomes as follows from these. (1) It is possible to execute immediately the initial assessment of internal expose from these data obtained this time and all alpha radioactivity that can be measured comparatively promptly by the presumption evaluation of radioactivities of each nuclides such as Pu and Am on the accident generation place. (2) If happened an abnormal discharge and the air contamination etc. of A radioactive substance, the originating place and the nuclide composition can be presumed by evaluating the $$gamma$$ radioactivity of Am-241 and all alpha radioactivity that can be measured comparatively promptly.

Oral presentation

Application of multi-channel rate meter to $$gamma$$-ray spectrometer

Saito, Kei; Takashima, Hideki; Emori, Shuichi; Soma, Susumu; Takada, Chie

no journal, , 

no abstracts in English

Oral presentation

Adjustment of the imaging plate to the site radiation control of nuclear facilities, 1

Usui, Toshihide; Takashima, Hideki; Saito, Kei; Tagawa, Hiroshi; Ito, Kimio; Emori, Shuichi

no journal, , 

no abstracts in English

Oral presentation

A Method of dead time measurement utilizing swipe sample inside hot cell

Iwasa, Atsutoshi; Nakayama, Naoto; Mikami, Satoshi; Eguchi, Kazutoshi; Takashima, Hideki; Hitomi, Junichi; Gomibuchi, Masaru*

no journal, , 

no abstracts in English

Oral presentation

Influence and countermeasure of introduction of surface contamination evaluation method based on JIS

Ishida, Keiichi; Mikami, Satoshi; Iwasa, Atsutoshi; Hamazaki, Masaaki; Usui, Toshihide; Takashima, Hideki; Hitomi, Junichi

no journal, , 

no abstracts in English

Oral presentation

Temporal facility radiation control activities in JAEA research reactor plants under ascended radiation levels due to the accident of Fukushima Daiichi Nuclear Plants

Irokawa, Hiroyuki; Hamazaki, Masaaki; Ishida, Keiichi; Miura, Yoshiyuki; Iwasa, Atsutoshi; Kano, Yutaka; Mikami, Satoshi; Takashima, Hideki; Hitomi, Junichi

no journal, , 

no abstracts in English

Oral presentation

Effect of sample condition for the measurement of the smear sample

Okawa, Yasuhisa; Mikami, Satoshi; Takashima, Hideki; Hitomi, Junichi

no journal, , 

no abstracts in English

Oral presentation

Characterization including removal factor of materials used for smear method on radiation protection

Usui, Toshihide; Iwai, Ryo; Gomibuchi, Masaru; Nakayama, Naoto; Iwasa, Atsutoshi; Takashima, Hideki; Hitomi, Junichi

no journal, , 

no abstracts in English

Oral presentation

Radiation management in view of the measurement of $$alpha$$-to-$$beta$$ ratio and the result of nuclide analysis

Nakayama, Naoto; Usui, Toshihide; Gomibuchi, Masaru; Takashima, Hideki; Hitomi, Junichi

no journal, , 

no abstracts in English

Oral presentation

Radiation management for work in hot cell contaminated by high level radioactive materials

Nakayama, Naoto; Iwasa, Atsutoshi; Hamazaki, Masaaki; Sumiya, Yoshinobu*; Ogiya, Takashi; Irokawa, Hiroyuki; Kano, Yutaka; Takashima, Hideki; Hitomi, Junichi

no journal, , 

no abstracts in English

Oral presentation

Characterization including removal factor of materials used for smear method on radiation protection, 2

Iwasa, Atsutoshi; Nakayama, Naoto; Maeda, Eita; Usui, Toshihide; Kano, Yutaka; Takashima, Hideki; Irokawa, Hiroyuki

no journal, , 

no abstracts in English

15 (Records 1-15 displayed on this page)
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