Determination of thoron and radon ratio by liquid scintillation spectrometry |
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| Authors: | H Yoshikawa T Nakanishi H Nakahara |
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| Institution: | (1) Kanazawa University, Kakuma-cho, Kanazawa, Ishikawa 920-1192, Japan; Address for correspondence: JAEA, 4-33 Muramatsu, Tokai-mura, Ibraki 319-1194, Japan;(2) Kanazawa University, Kakuma-cho, Kanazawa, Ishikawa 920-1192, Japan;(3) Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan |
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| Abstract: | 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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