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重复照射的效应和阈值剂量问题相当重要,它关系着人类对环境放射的危险度和其它致癌物的评价。作者用7周龄未交配的ICR雌性小鼠(按日本国立肿瘤中心研究所规定标准饲养),剪去背上的毛,不麻醉,将小鼠固定到特殊的照射架上,用40mCi~(90)锶-~(90)钇、呈直径为2cm圆盘状的β射线源,贴敷在体表,β射线源释放的体表剂量为228cGy/分,经胶片剂量仪校准。照射每周一、三、五重复
The effect of repeated irradiation and the threshold dose problem are very important. It is related to the human risk of environmental radiation and other carcinogens. The authors used 7-week-old uncopulated ICR female mice (bred according to the standards set by the National Institute of Oncology of Japan), cut off the hair on the back, did not anesthetize, and fixed the mice on a special irradiation stand, using 40 mCi~( 90) 锶-~ (90) 钇 呈 呈 呈 呈 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇 钇. Irradiation repeated every Monday, Wednesday and Friday