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
静岡県浜松市にある中田島砂丘および砂浜上279地点で線量率を測定した。線量率は汀線から砂丘にかけて漸増し，砂丘全域でほぼ一定の値を示した。スペクトル測定の結果，カリウム濃度は砂浜と砂丘でほぼ同じレベルであったがトリウム濃度は砂丘の方がかなり高い値であった。これを説明するためのモデルの原型を提案した。
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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