Variation of intensity of environmental gamma-rays measured with Ge(Li) spectrometer.

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概要

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• The variation of the intensity of environmental γ-rays has been studied with a Ge(Li) spectrometer. The 12 γ-rays were selected to be examined and typical characteristics of variations were obtained for each γ-ray. The intensity of γ-rays of <SUP>214</SUP>Pb and <SUP>214</SUP>Bi which are <SUP>222</SUP>Rn daughter nuclei increases on rainy days to the severalfold value of the average in the case of no precipitation. These variations were observed to be roughly proportional to rainfall rate in a sequence of precipitation. The γ-ray intensity of nuclides of the thorium series and <SUP>137</SUP>Cs is nearly constant within about 3% regardless of the weather. Its variation is about equal to the statistical fluctuation of the present measurements. The mean diurnal variations of γ-ray intensity were obtained on days without precipitation. The intensity of <SUP>214</SUP>Pb and <SUP>214</SUP>Bi γ-rays fluctuates nearly sinusoidally with an amplitude of about 6% of the average value and the maximum in the early morning.

• 一般社団法人 日本原子力学会の論文

著者

• TANAKA Kazuo

  Faculty of Engineering and Institute of Laser Engineering, Osaka University

• NARAHARA Yoshinori

  Faculty of Engineering, Kyushu University

• KATASE Akira

  Faculty of Engineering, Kyushu University

• ISHIHARA Yukihiro

  Faculty of Engineering, Kyushu University

• MATSUYAMA Hisayuki

  Faculty of Engineering, Kyushu University

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• Variation of intensity of environmental gamma-rays measured with Ge(Li) spectrometer.
• The Determination of Tin in Tin Metal and in Zircaloy by Precise Coulometric Titration

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