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Determination of thoron and radon ratio by liquid scintillation spectrometry

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Summary

A portable liquid scintillation counter was applied for the analysis of alpha-ray energy spectrum to determine the ratio of 220Rn/222Rn in fumarolic gas in the field. A surface-polished vial was developed, by which a Gaussian distribution could be approximated for the alpha-ray energy spectra and the peak areas of the nuclides could be estimated independently, because of the wide FWHM in the liquid scientillation pulse. A fumarolic gas sample was collected in Mt. Kamiyama (Hakoneyama geothermal field in Japan) having low 220Rn/222Rn ratio of 2.20±0.13.

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Authors and Affiliations

  1. Kanazawa University, Kakuma-cho, Kanazawa, Ishikawa 920-1192, Japan; Address for correspondence: JAEA, 4-33 Muramatsu, Tokai-mura, Ibraki 319-1194, Japan

    H. Yoshikawa

  2. Kanazawa University, Kakuma-cho, Kanazawa, Ishikawa 920-1192, Japan

    T. Nakanishi

  3. Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan

    H. Nakahara

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  1. H. Yoshikawa
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  2. T. Nakanishi
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  3. H. Nakahara
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Yoshikawa, H., Nakanishi, T. & Nakahara, H. Determination of thoron and radon ratio by liquid scintillation spectrometry. J Radioanal Nucl Chem 267, 195–203 (2005). https://doi.org/10.1007/s10967-006-0027-7

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  • DOI: https://doi.org/10.1007/s10967-006-0027-7

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