Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 65(9): 377-382 (2016)


砂浜–砂丘系における自然γ線の線量率分布—中田島砂丘の事例—Distribution of Natural γ Ray Dose Rates in a Beach-Dune System—A Case Study of the Nakatajima Dune—

放射線地学研究所Radiation Earth Science Laboratory ◇ 461–0024 愛知県名古屋市東区山口町9–6 ◇ 9–6 Yamaguchi-cho, Higashi-ku, Nagoya-shi, Aichi Pref. 461–0024, Japan

受付日:2016年2月24日Received: February 24, 2016
受理日:2016年5月16日Accepted: May 16, 2016
発行日:2016年9月15日Published: September 15, 2016


Natural γ ray dose rates were measured at 279 points in the Nakatajima dune along with the beach located in Hamamatsu City, Shizuoka Prefecture. The dose rate increased gradually from the shoreline to the dune, and revealed an approximately constant value on the entire area of the dune. As a result of spectrum measurements there, although the concentrations of potassium in the beach amounted to almost the same levels as those in the dune, the concentrations of Thorium in the dune were considerably high compared to those in the beach. A proto-type model was proposed in this paper to interpret the phenomena.

Key words: natural γ ray; dose rate; Nakatajima dune; beach

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