Radiation level in the Kashiwazaki Kariwa area

Tonouchi, Shigemasa; Shinoda, Yukio; Suzuki, Hiroshi; Komura, K.; Takizawa, Yukio

doi:10.1007/bf02063656

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1999

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“…3 The computer programs for the analysis of in situ spectra and calculation of dose rate were based on the improved BECK's method. 4 In this calculation, the following conditions were assumed; the nuclides of the U-and Th-series are in radioactive equilibrium with their daughters and 4~ and are distributed uniformly, 137Cs is distributed exponentially by depth and the soil moisture content is 10%.…”

Section: Measuring Techniquesmentioning

confidence: 99%

Natural radiation levels in Niigata Prefecture II. Natural radiation levels in Chuetsu and Joetsu districts

Tonouchi

Yoneda²,

Hashimoto

1999

J Radioanal Nucl Chem

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The natural radiation levels in Niigata Prefecture were studied from the aspects of the gamma-ray dose rate in Chuetsu and Joetsu districts. The former Chuetsu district was divided into three parts (Kashiwazaki, Nagaoka and Uonuma area). In the Uonuma area, the dose rates were higher than those of the other area, probably reflecting the geological circumstances. The most of the measuring points showed radionuclide contribution to the dose rates in the order of 4~ and the dose rates were significantly dependent on the different composition of radionuclides in the soils reflecting the original base rocks. In Niigata Prefecture, annual dose equivalent due to natural radiation from ground has the same level as the 0.34 mSv average value for Japan.

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Section: Measuring Techniquesmentioning

confidence: 99%