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Dose variation measurement at the high background radiation area in Indonesia

インドネシアにおける高自然放射線地域での線量変動の測定

佐々木 道也*; 山田 椋平 ; 赤田 尚史*; 床次 眞司*; 細田 正洋*; 岩岡 和輝*; Chanis, P.*; 工藤 ひろみ*; Sahoo, K.*; Iskandar, D.*; Pudjadi, E.*

Sasaki, Michiya*; Yamada, Ryohei; Akata, Naofumi*; Tokonami, Shinji*; Hosoda, Masahiro*; Iwaoka, Kazuki*; Chanis, P.*; Kudo, Hiromi*; Sahoo, K.*; Iskandar, D.*; Pudjadi, E.*

近年インドネシア西スラウェシ島にあるマムジュ市近傍は放射線レベルが高い地域として知られており、疫学調査研究の対象となる可能性を有している。本研究では環境及び個人の線量率の分布及び変動等を大まかに把握するため、1時間ごとの線量率をDシャトルを用いて測定した。マムジュ市の南にあるBotteng村及びその近隣の現地住民の協力のもと、3日間の短期間測定と9ヶ月の長期測定が行われた。このうち短期間測定では二人のボランティアにも線量計を着用いただいて個人線量を測定し、長期測定では7箇所の家屋内外で測定した。本測定では幾分の変動が認められたため、ラドン濃度との関連が示唆された。

Recently, Mamuju city in Sulawesi Island, Indonesia and its surrounding area is known as the high background radiation area, and is regarded as a possible area for an epidemiological study. In this study we have measured the hourly dose rates of individuals and the environment with the D-shuttle dosimeter, which has been developed by the Chiyoda Technol Corporation. With the aid of local residents living at Botteng village, which is located south of Mamuju city, short term and long term measurements were conducted for three days and nine months, respectively. Two volunteers have equipped the D-shuttle for the short term measurement, and seven families supported the short and long term measurements of the environmental dose rate, for both inside and outside the house. From our results, since some variation was observed regarding with day or night, correlation with radon concentration was suggested.

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