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日本原子力研究所48年間の被ばく統計

Statistics of individual doses of JAERI for the past 48 years

白石 明美; 関口 真人; 橘 晴夫 ; 吉澤 道夫 ; 小室 祐二*; 根本 喜代子*; 大川 伊久子*

Shiraishi, Akemi; Sekiguchi, Masato; Tachibana, Haruo; Yoshizawa, Michio; Komuro, Yuji*; Nemoto, Kiyoko*; Okawa, Ikuko*

日本原子力研究所(原研)では、設立の翌年(1957年)から放射線作業者(放射線業務従事者)の個人被ばく線量管理が開始された。本報告では、これまでに集積された個人被ばく線量データをもとに、2005年10月の日本原子力研究開発機構発足までの48年間にわたる被ばく統計をまとめた。これらの統計結果から、原研における放射線作業の変遷とともに、ALARAの精神に基づく被ばく線量低減が読み取れる。また、累積頻度の解析から、近年では、比較的被ばく線量の高い特定の作業集団が存在することがわかった。

In Japan Atomic Energy Research Institute (JAERI), individual monitoring and dose data recording for radiation workers have been conducted since 1957, the next year of which JAERI was established. This report compiles the statistics of individual doses, such as average doses, collective doses, the number of radiation workers and dose distributions, over the past 48 years from 1957 to 2005, when JAERI merged with Japan Nuclear Cycle Development Institute into Japan Atomic Energy Agency. Transition of the statistics showed the history of radiation works in JAERI and many efforts for dose reduction based on the ALARA principle recommended by ICRP. In addition, it was found from the analysis of cumulative distributions that, in recent years, there was a specific work-group exposed to significantly high dose compared with other workers.

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