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Issue 6, 2001
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85Kr measurement system for continuous monitoring at the Meteorological Research Institute, Japan

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Abstract

A 85Kr measurement system for continuous monitoring based principally on the BfS-IAR method (activity measurement of 85Kr by gas counting coupled with gas chromatographic separation, using pure CH4 as carrier and counting gas) was implemented for the first time in Japan. In this paper, a detailed description of the system and procedures is given and the inter-comparison results of our system with the BfS-IAR system are presented. A consistent temporal concentration change with high accuracy and consistency of the respective data with the BfS-IAR data (maximum difference of 5%) were achieved with the Meteorological Research Institute (MRI) system, which shows that the system is valid and reliable for the purpose of background monitoring for 85Kr in air. Also, the 85Kr monitoring record at the MRI during 1995–2001 is described. The record distinctively shows the Northern Hemispheric background 85Kr concentrations at the mid-latitude and the elevated concentrations affected by the operation of a nuclear fuel reprocessing plant in Tokai-mura, Ibaraki, Japan.

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Publication details

The article was received on 08 Jun 2001, accepted on 19 Sep 2001 and first published on 06 Nov 2001


Article type: Paper
DOI: 10.1039/B105067M
Citation: J. Environ. Monit., 2001,3, 688-696
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    85Kr measurement system for continuous monitoring at the Meteorological Research Institute, Japan

    Y. Igarashi, M. Aoyama, K. Nemoto, K. Hirose, T. Miyao, K. Fushimi, M. Suzuki, S. Yasui, Y. Asai, I. Aoki, K. Fujii, S. Yamamoto, H. Sartorius and W. Weiss, J. Environ. Monit., 2001, 3, 688
    DOI: 10.1039/B105067M

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