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Primary functions of the first Japanese large-scale facility for exposing small animals to radon

日本初の大規模な小動物のラドン吸入試験設備の主な機能

石森 有; 光延 文裕*; 山岡 聖典*; 田中 裕史; 片岡 隆浩*; 迫田 晃弘*

Ishimori, Yuu; Mitsunobu, Fumihiro*; Yamaoka, Kiyonori*; Tanaka, Hiroshi; Kataoka, Takahiro*; Sakoda, Akihiro*

日本原子力研究開発機構と岡山大学はラドンの詳細な身体への影響を調査するため、2007年から動物試験及び関連する研究を実施し、われわれの動物試験の統計上の確実性を増やすため日本で最初の大規模な小動物のラドン吸入試験設備を開発したので、本設備の性能について報告する。本設備ではマウス150匹規模で同時に異なるラドン濃度で吸入試験が可能である。ここでは、ラドン濃度の制御とトロンの除去について施設の基本性能を示した。より低いラドン濃度の場合では自然放射能の影響を受けるが、より高いラドン濃度においては、ラドン濃度の相対的な標準偏差はおよそ5%であった。

Japan Atomic Energy Agency (JAEA) and Okayama University have carried out the experimental animal study and its related studies since 2007 in order to examine the physical effect of radon in detail. Thus, a radon test facility for small animals was developed in order to increase the statistical certainty of our animal tests. This paper illustrates the performance of the facility, the first large-scale facility in Japan. The facility has a potential of about 150 mouse-scale test at the same time. Different concentration at each animal chamber group is available. Controlling radon and avoiding thoron were theoretically and experimentally shown as the fundamental performance of the facility. The relative standard deviation of the radon concentration at the highest concentration group was about 5%, although the lower concentration groups seemed to be affected by variation of background.

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