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引言了解空气中放射性气体和放射性气溶胶对全身计数器本底的贡献,从而控制本底起伏,对于简易型全身计数器的良好运行是十分有益的。一年多来,我们对一台简易型全屏蔽全身计数器本底进行了长期监测,观测到在我们现有装置条件下本底起伏较大,在通风不良(门窗关闭)与通风良好(门窗打开)时所测得的本底谱在~(137)Cs 道区内本底计数率的变化相当人体内2.2nCi 的~(137)Cs,在~(226)Ra 道区内,则相当于人体内10.7nCi的~(226)Ra。本文将介绍这些测试结果,分析其原因,并讨论一些控制简易型全身计数器本底起伏的措施。
INTRODUCTION Understanding the contribution of radioactive and radioactive aerosols in the air to the background of whole-body counters to control background fluctuations is instructive for the easy operation of simple full-body counters. For more than a year, we conducted a long-term monitoring of the background of a simple, full-screen, full-body, full-body counter, observing the large background fluctuations in our existing installations, poor ventilation (doors and windows closed) and well ventilated ). The background count rate in the ~ (137) Cs track was comparable to that of ~ (137) Cs in 2.2 nCi in the ~ (137) Cs track and ~ 226 in the Ra track, In vivo 10.7 nCi ~ (226) Ra. This article describes these test results, analyzes their causes, and discusses some measures to control the background ups and downs of a simple full-body counter.