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Journal Articles

Current status and newly introduced analytical techniques for safeguards environmental samples at JAERI

Magara, Masaaki; Usuda, Shigekazu; Sakurai, Satoshi; Watanabe, Kazuo; Esaka, Fumitaka; Hirayama, Fumio; Lee, C. G.; Yasuda, Kenichiro; Kono, Nobuaki; Inagawa, Jun; et al.

Proceedings of INMM 46th Annual Meeting (CD-ROM), 8 Pages, 2005/00

JAERI has been developing analytical techniques for ultra-trace amounts of nuclear materials in the environmental samples in order to contribute to the strengthened safeguards system. Development of essential techniques for bulk and particle analysis of the environmental swipe sample has been established as an ultra-trace analytical method of uranium and plutonium. In January 2003, JAERI was qualified as a member of the IAEA network analytical laboratories for environmental samples. Since then, JAERI has conducted the analysis of domestic and the IAEA samples. From Japanese fiscal year 2003, the second phase of the project was started for the development of advanced techniques, such as analyzing minor actinides and fission products as well as uranium and plutonium, particle analysis using fission-track technique, more efficient particle analysis using ICP-TOFMS and screening by X-ray fluorescent analysis. This paper deals with the progress in the development of the new techniques, applications and future perspective.

Journal Articles

Radiation measurement for safeguards environmental samples by imaging plate

Yasuda, Kenichiro; Sakurai, Satoshi; Gunji, Hideho; Usuda, Shigekazu

Journal of Nuclear Science and Technology, 39(Suppl.3), p.552 - 555, 2002/11

In order to contribute to the strengthened safeguards system based on the Program 93+2 of the IAEA, Japan Atomic Energy Research Institute (JAERI) constructed the CLEAR facility (Clean Laboratory for Environmental Analysis and Research) and is developing analytical technology for ultra trace amounts of nuclear materials in environmental samples. To avoid cross-contamination among the samples and contamination of the clean rooms, radioactive materials in the samples to be introduced into the CLEAR facility will be limited to a certain amount. For this purpose the authors have examined the feasibility of Imaging-plate method, which is a kind of autoradiography and is suitable for determination on distribution of low-level radioactivity in the samples. Preliminary examination with $$beta$$-ray (K-40), the linearity was obtained in the range of 0.01 - 0.2 Bq. The experiments with $$alpha$$-ray (Sm-147) suggested the detection limit of 0.01 Bq, which was equivalent to 2 $$mu$$g of natural uranium. At the presentation, the results on actual environmental samples will be reported.

Journal Articles

Development for ultra-trace analysis method of U and Pu in safeguards environmental samples at the clean facility

Takahashi, Masato; Magara, Masaaki; Sakurai, Satoshi; Kurosawa, Setsumi; Esaka, Fumitaka; Taguchi, Takuji; Takai, Konomi; Fukuyama, Hiroyasu; Lee, C. G.; Yasuda, Kenichiro; et al.

Dai-23-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu, 8 Pages, 2002/09

Based on the strengthen safeguard program of the IAEA to detect undeclared nuclear activities, the method of precise and accurate isotope ratio determination for uranium and plutonium in the environmental samples (cotton swipes) has been developed at JAERI. The samples should be treated in clean environment in order to secure the analytical reliability by eliminating external contamination from the samples containing trace amount of uranium and plutonium. Since the measurement by ICP-MS is favorable to bulk analysis from view points of analytical capacity and operation simplicity, we have studied sample preparation procedures for the trace amount of uranium and plutonium to be applied to ICP-MS. Up to the present, interfering factors involved during analytical processes and the ICP-MS measurement of uranium and plutonium were examined. As a result, uranium and plutonium isotope measurement more than 100 pg and 100 fg, respectively, became possible at JAERI clean facility. At presentation, other progress in the development will be reported.

Journal Articles

Recent status of developments in analytical methods for safeguards environmental samples; Focused on particle analysis

Esaka, Fumitaka; Magara, Masaaki; Hanzawa, Yukiko; Sakurai, Satoshi; Taguchi, Takuji; Takai, Konomi; Sakakibara, Takaaki; Kurosawa, Setsumi; Takahashi, Masato; Yasuda, Kenichiro; et al.

Dai-22-Kai Kaku Busshitsu Kanri Gakkai Nihon Shibu Nenji Taikai Rombunshu, 8 Pages, 2001/11

no abstracts in English

Journal Articles

Simultaneous $$alpha$$, $$beta$$/$$gamma$$ and neutron counting with phoswich detectors by using a dual-parameter technique

Yasuda, Kenichiro; Usuda, Shigekazu; Gunji, Hideho

IEEE Transactions on Nuclear Science, 48(4), p.1162 - 1164, 2001/08

 Times Cited Count:7 Percentile:48.75(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Development of trace analytical technology for nuclear materials in the clean laboratory for environmental analysis and research

Usuda, Shigekazu; Watanabe, Kazuo; Sakurai, Satoshi; Magara, Masaaki; Hanzawa, Yukiko; Esaka, Fumitaka; Miyamoto, Yutaka; Yasuda, Kenichiro; Saito, Yoko; Gunji, Katsubumi*; et al.

KEK Proceedings 2001-14, p.88 - 92, 2001/06

no abstracts in English

Journal Articles

Current status of JAERI program on development of ultra-trace-analytical technology for safeguards environmental samples

Adachi, Takeo; Usuda, Shigekazu; Watanabe, Kazuo; Sakurai, Satoshi; Magara, Masaaki; Hanzawa, Yukiko; Esaka, Fumitaka; Yasuda, Kenichiro; Saito, Yoko; Takahashi, Masato; et al.

IAEA-SM-367/10/02 (CD-ROM), 8 Pages, 2001/00

no abstracts in English

Journal Articles

Development of scintillation-light-transmission type phoswich detector for simultaneous $$alpha$$- and $$beta$$($$gamma$$)-ray counting

Yasuda, Kenichiro; Usuda, Shigekazu; Gunji, Hideho

IEEE Transactions on Nuclear Science, 47(4), p.1337 - 1340, 2000/08

 Times Cited Count:8 Percentile:50.73(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Properties of a YAP powder scintillator as $$alpha$$-ray detector

Yasuda, Kenichiro; Usuda, Shigekazu; Gunji, Hideho

Applied Radiation and Isotopes, 52(3), p.365 - 368, 2000/03

 Times Cited Count:16 Percentile:70.5(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Present status of JAERI's project on the development of environmental sample analysis techniques

Usuda, Shigekazu; Adachi, Takeo; Watanabe, Kazuo; Magara, Masaaki; Hanzawa, Yukiko; Esaka, Fumitaka; Miyamoto, Yutaka; Yasuda, Kenichiro; Gunji, Hideho; Tsuruta, Yasuhiro; et al.

Proceedings of Seminar on Strengthening of Safeguards: Integrating the New and the Old, p.477 - 481, 2000/00

no abstracts in English

Journal Articles

Application of a Phoswich detector for simultaneous counting of $$alpha$$- and $$beta$$($$gamma$$)-rays in a rotating drum-cell type monitor

Usuda, Shigekazu; Yasuda, Kenichiro; Sakurai, Satoshi; Takahashi, Toshiyuki; Gunji, Hideho*; P.Howarth*

INMM 39th Annual Meeting Proceedings (CD-ROM), 27, 6 Pages, 1998/00

no abstracts in English

Journal Articles

Improvement of a rotating drum-cell type alpha monitor and its performance test

Usuda, Shigekazu; Yasuda, Kenichiro; Sakurai, Satoshi; Takahashi, Toshiyuki; Gunji, Hideho*

Dai-18-Kai Kaku Busshitsu Kanri Gakkai (INMM) Nihon Shibu Nenji Taikai Hobunshu, p.142 - 148, 1997/11

no abstracts in English

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