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Journal Articles

Monitoring of airborne $$^{14}$$C discharge at RI facilities; A Comparison of collection and oxidation methods

Ueno, Yumi; Koarashi, Jun; Iwai, Yasunori; Sato, Junya; Takahashi, Teruhiko; Sawahata, Katsunori; Sekita, Tsutomu; Kobayashi, Makoto; Tsunoda, Masahiko; Kikuchi, Masamitsu

Hoken Butsuri, 49(1), p.39 - 44, 2014/03

The Japan Atomic Energy Agency has conducted a monthly monitoring of airborne $$^{14}$$C discharge at the forth research building (RI facility) of the Tokai Research and Development Center. In the current monitoring, $$^{14}$$C, which exists in various chemical forms in airborne effluent, is converted into $$^{14}$$CO$$_{2}$$ with CuO catalyst and then collected using monoethanolamine (MEA) as CO$$_{2}$$ absorbent. However, this collection method has some issues on safety management because the CuO catalyst requires a high heating temperature (600$$^{circ}$$C) to ensure a high oxidation efficiency and the MEA is specified as a poisonous and deleterious substance. To establish a safer, manageable and reliable method for monitoring airborne $$^{14}$$C discharge, we examined collection methods that use different CO$$_{2}$$ absorbents (MEA and Carbo-Sorb E) and oxidation catalysts (CuO, Pt/Alumina and Pd/ZrO$$_{2}$$). The results showed 100% CO$$_{2}$$ collection efficiency of MEA during a 30-day sampling period under the condition tested. In contrast, Carbo-Sorb E was found to be unsuitable for the monthly-long CO$$_{2}$$ collection because of its high volatile nature. Among the oxidation catalysts, the Pd/ZrO$$_{2}$$ showed the highest oxidation efficiency for CH$$_{4}$$ at a lower temperature.

JAEA Reports

Emergency monitoring of environmental radiation and atmospheric radionuclides at Nuclear Science Research Institute, JAEA following the accident of Fukushima Daiichi Nuclear Power Plant

Okura, Takehisa; Oishi, Tetsuya; Taki, Mitsumasa; Shibanuma, Yukio; Kikuchi, Masamitsu; Akino, Hitoshi; Kikuta, Yasuaki; Kawasaki, Masatsugu; Saegusa, Jun; Tsutsumi, Masahiro; et al.

JAEA-Data/Code 2012-010, 37 Pages, 2012/05

JAEA-Data-Code-2012-010.pdf:2.28MB

Due to the accident at Fukushima Daiichi Nuclear Power Plant caused by the 2011 off the Pacific coast of Tohoku Earthquake occurred at 11th March 2011, the emergency environmental radiation monitoring was conducted at Nuclear Science Research Institute, Japan Atomic Energy Agency (JAEA). This report provides the monitoring results of ambient $$gamma$$-ray dose rate and atmospheric radioactivity concentration until the beginning of June 2011. Some anthropogenic radionuclides such as Cs-134, Cs-137, I-131, I-132, Te-132, Xe-133 and others were detected from air samples. The atmospheric radioactivity concentrations varied with some peaks corresponded with that of ambient $$gamma$$-ray dose rate after 15th March 2011. Composition of each peak showed various characteristic. Internal exposure caused by inhalation was estimated from the observed atmospheric radioactivity.

JAEA Reports

Isopleths of surface air concentration and surface air kerma rate due to a radioactive cloud released from a stack, 3

Tachibana, Haruo; Kikuchi, Masamitsu; Sekita, Tsutomu; Yamaguchi, Takenori; Oeda, Mikihiro*; Kurosawa, Naohiro*

JAERI-Data/Code 2004-010, 19 Pages, 2004/06

JAERI-Data-Code-2004-010.pdf:1.92MB
JAERI-Data-Code-2004-010-appendix(CD-ROM).zip:12.12MB

This report is a revised edition of "Isopleths of Surface Air Concentration and Surface Air Absorbed Dose Rate due to a Radioactive Cloud Released from a Stack(II)"(JAERI-M 90-206) and based on the revised Nuclear Safety Guidelines reflected the ICRP1990 Recommendation. Characteristics of this report are the use of Air Karma Rate (Gy/h) unit instead of Air Absorbed Dose Rate (Gy/h) unit, and the records of isopleths of surface air concentration and surface air karma rate on CD-ROM. These recorded data on CD-ROM can be printed out on paper and/or pasted on digital map by personal computer.

Journal Articles

Measurement of depth distributions of $$^{3}$$H and $$^{14}$$C induced in concrete shielding of an electron accelerator facility

Endo, Akira; Harada, Yasunori; Kawasaki, Katsuya; Kikuchi, Masamitsu

Applied Radiation and Isotopes, 60(6), p.955 - 958, 2004/06

 Times Cited Count:4 Percentile:68.32(Chemistry, Inorganic & Nuclear)

no abstracts in English

JAEA Reports

A Development of a database system for the released radioactive gases and liquid from the nuclear facilities

Kikuchi, Masamitsu; Taki, Mitsumasa; Kume, Etsuo; Kobayashi, Hideo*; Yamada, Toshio*; Yamaguchi, Takenori

JAERI-Data/Code 2004-006, 146 Pages, 2004/03

JAERI-Data-Code-2004-006.pdf:6.87MB

The nuclear facilities, which are required to control the released radioactive gases and liquid, exist in Tokai research establishment as much as 40. These radioactive controls are carried out complying with the statutes in each facility. The released radioactivity data of each facility must be reported to MEXT and Ibaraki Prefecture from Tokai Research Establishment. This system is developed to make the database gathering the radioactivity data of each facilities for unitary control as Tokai Research Establishment and contribute to make the reports to MEXT and Ibaraki Prefecture.

JAEA Reports

Dose evaluation with ICRP Publication 60 at postulated accidents of NSRR, 2003

Kashima, Yoichi; Taki, Mitsumasa; Kikuchi, Masamitsu; Sasajima, Hideo; Nakamura, Takehiko

JAERI-Tech 2003-088, 100 Pages, 2003/12

JAERI-Tech-2003-088.pdf:5.55MB

A new experiment plan is in progress to perform pulse-irradiation experiments at the NSRR with irradiated fuel rods in the high temperature and high pressure capsules. This report describes the results of the public dose evaluation for the design basis accident and postulated accidents with the models that follow the ICRP Publication 60. It was confirmed that the results met the criteria for safety design and siting with ample margins.

JAEA Reports

Development of Environmental Dose Assessment System (EDAS) code for PC version

Taki, Mitsumasa; Kikuchi, Masamitsu; Kobayashi, Hideo*; Yamaguchi, Takenori

JAERI-Data/Code 2003-006, 99 Pages, 2003/05

JAERI-Data-Code-2003-006.pdf:6.97MB

A computer code (EDAS) was developed to assess the public dose for the safety assessment to get the license of nuclear reactor operation. This code system is used for the safety analysis of public around the nuclear reactor in case of normal operation and severe accident. This code was revised and composed for personal computer user according to the Nuclear Safety Guidelines reflected the ICRP1990 recommendation. These guidelines are revised by Nuclear Safety Commission on March, 2001, which are “Weather analysis guideline for the safety assessment of nuclear power reactor", “ Public dose around the facility assessment guideline corresponding to the objective value for nuclear power light water reactor" and “Public dose assessment guideline for safety review of nuclear power light water reactor". This code has been already opened for public user by JAERI, and English version code and user manual are prepared moreover. This English version code is helpful for international cooperation concerning the nuclear safety assessment with JAERI.

Journal Articles

Lecture of detection manual on environmental radiation dose

Kikuchi, Masamitsu

Hoken Butsuri, 37(1), p.12 - 14, 2002/03

no abstracts in English

JAEA Reports

Measurement of concentrations of $$gamma$$-ray emitters induced in the concrete shield of the JAERI electron linac facility

Endo, Akira; Kawasaki, Katsuya; Kikuchi, Masamitsu; Harada, Yasunori

JAERI-Tech 97-027, 28 Pages, 1997/07

JAERI-Tech-97-027.pdf:1.03MB

no abstracts in English

Journal Articles

Fabrication and superconducting properties of Nb$$_{3}$$Al composite wire using the jelly roll process

Sakagami, Yoshihiro*; Yamazaki, Takayuki*; Aoki, Nobuo*; Ichihara, Masamitsu*; Masegi, Tamaki*; Murase, Satoru*; Matsui, Kunihiro; Ushigusa, Kenkichi; Kikuchi, Mitsuru; Takahashi, Yoshikazu

ICEC16/ICMC Proceedings, p.1681 - 1684, 1996/00

no abstracts in English

Journal Articles

Characteristics of the chemical forms of $$^{11}$$C, $$^{13}$$N, and $$^{15}$$O induced in air by the operation of a 100MeV electron linear accelerator

Endo, Akira; Kikuchi, Masamitsu; ; Ikezawa, Yoshio

Health Physics, 68(1), p.80 - 88, 1995/01

 Times Cited Count:6 Percentile:43.57(Environmental Sciences)

no abstracts in English

Oral presentation

Environmental dose assessment system with EDAS and GIS for multiple source terms

Kikuchi, Masamitsu; Oishi, Tetsuya; Takahashi, Kenichi; Murakami, Hiroyuki; Seki, Akiyuki; Kubota, Jinichi*

no journal, , 

no abstracts in English

Oral presentation

Radiation protection practices at the nuclear science research institute under the influence of Fukushima nuclear accident, 4; Environmental radiation monitoring

Oishi, Tetsuya; Kikuchi, Masamitsu; Takahashi, Kenichi; Okura, Takehisa; Akino, Hitoshi; Kawasaki, Masatsugu; Kikuta, Yasuaki; Saegusa, Jun; Shibanuma, Yukio; Yamamoto, Hideaki

no journal, , 

no abstracts in English

Oral presentation

Radiation protection practices at the nuclear science research institute under the influence of Fukushima nuclear accident, 2; Radiation control of nuclear facilities

Kikuchi, Masamitsu; Umehara, Takashi; Shishido, Nobuhito; Kuramochi, Akihiko; Fujii, Katsutoshi; Nakajima, Junya

no journal, , 

no abstracts in English

Oral presentation

Examination of the liquid scintillator suitable for a radiation administrative task

Sekita, Tsutomu; Kobayashi, Toshiaki; Hiraga, Hayato; Yasuda, Takayuki; Kikuchi, Masamitsu; Tsunoda, Masahiko

no journal, , 

no abstracts in English

Oral presentation

Investigation about $$^{14}$$C monitoring in RI facilities

Ueno, Yumi; Takahashi, Teruhiko; Sawahata, Katsunori; Kikuchi, Masamitsu; Tsunoda, Masahiko

no journal, , 

no abstracts in English

Oral presentation

Examination for confidence of quenched standard sources for liquid scintillation counter

Kawasaki, Takayuki; Sekita, Tsutomu; Kikuchi, Masamitsu; Tsunoda, Masahiko

no journal, , 

no abstracts in English

Oral presentation

Investigation of inspection method of centralized air sampling device for radiation protection

Yoshida, Keisuke; Yamada, Katsunori; Yoda, Tomoyuki; Tsunoda, Junichi; Muto, Yasushi; Kobayashi, Makoto; Kikuchi, Masamitsu

no journal, , 

no abstracts in English

18 (Records 1-18 displayed on this page)
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