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JAEA Reports

Development of new $$alpha$$-ray measurement methods with radon suppression focused on pulse time interval

Sanada, Yukihisa; Nohara, Naofumi*; Adachi, Yasuyuki*; Nemoto, Kazuhiko*; Kawai, Keiichi*; Kobayashi, Hirohide; Hashimoto, Tetsuo*

JAEA-Technology 2005-009, 33 Pages, 2006/01

JAEA-Technology-2005-009.pdf:1.42MB

An $$alpha$$-ray measurement methods based on analyzing the time interval of pulses was newly developed. This method was developed aiming to suppress the background counts originated in progeny of uranium series. A delayed coincidence and time interval analysis (TIA) methods have been applied to measure a-b decay successive events (correlated events) on microsecond time-scale (164$$mu$$s). The measurement system have such functions with silicon detectors was developed intending to shorten the dead time. The basic performance of the system was examined by using $$^{230}$$Th electrodeposited sources. Follows were obtained in this work : The theory of measurement $$^{214}$$Po using TIA methods was established. Measurement system of $$^{214}$$Po was developed. Conformation methods of correlated events by using $$^{230}$$Th electrodeposited sources was suggested. The efficiency of correlated events in aerosol samples was estimated. The methods to measure correlated events was indicated by addition of $$^{230}$$Th. The method of subtracting the progenies of the thorium series are to examine.

Oral presentation

A Verification test of commercial calibration device for beta and neutron rays for EPD

Kimura, Daisuke; Hikinuma, Yuichi; Tanabe, Masanori; Makino, Tatsuya; Maegawa, Yoshiharu; Hayata, Kenichi*; Shiotani, Junya*; Nohara, Naofumi; Hoshi, Katsuya; Tsujimura, Norio; et al.

no journal, , 

no abstracts in English

Oral presentation

Examination for optimization of Mask Fit Testing implementation method using atmospheric dust

Wada, Rina; Nakayama, Naoto; Nohara, Naofumi; Saito, Kei

no journal, , 

no abstracts in English

Oral presentation

Installation of KURAMA-II for on-site monitoring

Maeda, Eita; Hashimoto, Makoto; Nohara, Naofumi; Muto, Yasunobu; Yamada, Junya; Hamaguchi, Takumi; Inoue, Yuki

no journal, , 

no abstracts in English

Oral presentation

Long-term stationary monitoring data of KURAMA-II under the on-site environment

Igarashi, Yu; Hamaguchi, Takumi; Maeda, Eita; Yamada, Junya; Muto, Yasunobu; Tanigaki, Minoru*; Nohara, Naofumi

no journal, , 

At the JAEA Oarai Research Establishment, a portable KURAMA equipped with a data transmission function through an autonomous network using the ZETA standard was permanently installed near the MP for the purpose of redundancy in the measurement of monitoring points, and a system for observing radiation doses near the site boundary was developed. In this presentation, we report on the fixed point observation data for about one year using this system.

Oral presentation

Introduction of KURAMA-II with wireless communication "ZETA" for monitoring nuclear operators

Igarashi, Yu; Hamaguchi, Takumi; Maeda, Eita; Yamada, Junya; Muto, Yasunobu; Nohara, Naofumi

no journal, , 

At the Oarai Research Institute of the Japan Atomic Energy Agency, a portable KURAMA equipped with a data transmission function using an autonomous network based on the ZETA standard was permanently installed in the vicinity of the MP, and a system for observing radiation doses around the site boundary was developed. In this presentation, the background to the redundancy of post-measurement monitoring, which is the purpose of this system installation, and the fixed-point observation data for about one year will be reported.

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