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$$gamma$$線低線量率場における電子式個人線量計の応答

Investigation of electronic personal dosemeters response in the $$gamma$$-ray field with low dose rate

小島 尚美; 中川 貴博 ; 山崎 巧 ; 滝本 美咲  ; 高田 千恵 

Kojima, Naomi; Nakagawa, Takahiro; Yamazaki, Takumi; Takimoto, Misaki; Takada, Chie

電子式個人線量計(EPD)は、その場で線量の確認ができることや、ガラスバッジなどよりも低い線量の測定が可能なことから近年利用が広がっている。しかし低線量の$$gamma$$線に対する応答を確認する場合、バックグラウンドの影響を低減させるために校正室全体の遮蔽が必要となり実際の照射試験は困難であった。今回、産業技術総合研究所で開発された低線量率校正システムを用いて、トレンド記録機能を有する2機種のEPDに対して0.1$$mu$$Sv/h以下の$$^{137}$$Cs $$gamma$$線照射を行った。EPDの積算線量と標準偏差の変動を解析し、低線量での応答を調査した。

In late years, Electronic Personal Dosemeter (EPD) has been widely used because of its useful specifications: indicating measurement values on site, lower detect limits than glass badge. However, an investigation of its response characteristic is difficult to perform using actual low dose rate $$gamma$$-ray. The investigation needs sheildings of a entire irradiation room for reducing natural radiation. In this study, at the compact irradiation system with low dose rate which National Institute of Advanced Industrial Science and technology developed, $$gamma$$-ray of $$^{137}$$Cs below 0.1$$mu$$Sv/h were irradiated to two models of EPD with recording function. Integrated dose and standard deviation for EPD were analyzed to investigate response characteristics for low dose rate radiation.

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