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Journal Articles

Journal Articles

New laser decontamination technique for radioactively contaminated metal surfaces using acid-bearing sodium silicate gel

Kameo, Yutaka; Nakashima, Mikio; Hirabayashi, Takakuni*

Journal of Nuclear Science and Technology, 41(9), p.919 - 924, 2004/09

 Times Cited Count:10 Percentile:58.07(Nuclear Science & Technology)

A new laser decontamination method utilizing a gel made from a sodium silicate solution and an acid was developed for removing radioactive nuclide incorporated into a surface oxide layer on metal waste. Decontamination tests were carried out using both simulated contaminated samples and pipe specimens cut from the primary coolant system of the Japan Power Demonstration Reactor. In the case of surface oxide layer consisting mainly of iron oxide, more than 99% of surface radioactivities were removed after two to three decontamination runs. In order to ascertain the role of laser irradiation on chemical reactions, chemical states of O and Fe in the oxide layer before and after decontamination were analyzed by X-ray photoelectron spectroscopy. It was found that the oxide layer was dissolved into the acid-containing gel, and the reaction was extensively promoted by the laser irradiation.

Journal Articles

Development of automated measurement device for low-level radioactive contamination on building surfaces

Tachibana, Mitsuo; Ito, Hirokuni*; Hatakeyama, Mutsuo*; Yanagihara, Satoshi

Nihon Genshiryoku Gakkai Wabun Rombunshi, 3(1), p.120 - 127, 2004/03

The RAPID-1600 was developed to measure a low-level radioactive contamination on building surfaces automatically. The double layered detectors are structured by two gas flow type detectors with a $$beta$$ rays shielding plate between the two detectors and it is horizontally positioned. The lower counter measures $$beta$$ and $$gamma$$ rays and the upper counter measures $$gamma$$ rays. The $$beta$$ rays counting rates are derived by subtracting $$gamma$$ rays counting rates of the upper counter from $$gamma$$ and $$beta$$ rays counting rates of the lower counter. This mechanism results in sensitive to $$beta$$ rays against to low background radiation conditions. The driving unit can move omnidirectionally by controlling two driving wheels individually, and has a capability to correct its position if an orbital error is detected by the self-position identification system. The RAPID-1600 was successfully applied to the actual measurement in the radioisotope production facilities. The RAPID-1600 is expected to be a useful tool for measurement of radioactivity in decommissioning nuclear facilities.

Journal Articles

Uniformity of beta-ray plane sources for the calibration of surface contamination monitors

Kinouchi, Nobuyuki; Oishi, Tetsuya; Yoshida, Makoto

Radioisotopes, 50(5), p.183 - 189, 2001/05

no abstracts in English

JAEA Reports

Proceedings of the IAEA/RCA Training Workshop on Contamination Monitoring

Endo, Akira; Oishi, Tetsuya; Takahashi, Fumiaki; Murakami, Hiroyuki

JAERI-Conf 97-008, 184 Pages, 1997/06

JAERI-Conf-97-008.pdf:4.67MB

no abstracts in English

Journal Articles

A Prototype of tritium monitor probe

Kaneko, Kiichi; Masaki, Kei;

Bunshi Kagaku Kenkyujo Gijutsu Kenkyukai Hokokushu, 0(15), p.108 - 111, 1996/07

no abstracts in English

Journal Articles

Application of fuzzy theory to radiation control

Hoken Butsuri, 29, p.460 - 462, 1994/00

no abstracts in English

Journal Articles

Radiation protection in decontamination work of hot cells in reactor fuel examination facility

Sato, Nobuyuki; ; Kobayashi, Makoto; Nakazawa, Takashi; ; ; Ikezawa, Yoshio

Proc. of the Int. Conf. on Radiation Effects and Protection, p.440 - 445, 1992/00

no abstracts in English

Journal Articles

Radiation protection on the decommissioning of JPDR

; ; Onodera, Junichi; ; Ikezawa, Yoshio

Proc. of the Int. Conf. on Radiation Effects and Protection, p.434 - 439, 1992/00

no abstracts in English

Journal Articles

Present status and problems of decommissioning technology, 7; Radiation control

Ikezawa, Yoshio

Nihon Genshiryoku Gakkai-Shi, 33(5), p.439 - 440, 1991/05

no abstracts in English

Journal Articles

Action in radiation protection to new national radiological regulations; Practice in radiation control

Matsui, Hiroshi; Ikezawa, Yoshio

Firumu Bajji Nyusu, 0(161), p.7 - 10, 1990/05

no abstracts in English

Journal Articles

The Situation of JPDR decommissioning

; Ikezawa, Yoshio

Hoken Butsuri, 25(3), p.294 - 298, 1990/00

no abstracts in English

Journal Articles

Development of reactor decommissioning technoloogy in JAERI; Radiation control

;

Genshiryoku Kogyo, 32(9), p.70 - 74, 1986/09

no abstracts in English

Journal Articles

Radioactive Decontamination

Wadachi, Yoshiki

Radioisotopes, 23(12), p.723 - 728, 1974/12

no abstracts in English

Journal Articles

Estimation of the level of tritium surface contamination by smearing

; ; ; ;

Hoken Butsuri, 8(2), p.67 - 71, 1973/02

no abstracts in English

15 (Records 1-15 displayed on this page)
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