Monitoring of Airborne Radioactive Materials in the Working Environment Using a Multichannel Interface-equipped Room Dust Moitor System
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概要
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A portable monitoring system of airborne radioactive materials was developed for sequential monitoring of many workrooms. The system consisted of a room dust monitor detectable for the particulates emitting beta rays with its maximum energy higher than 0.15 MeV and a personal computer connected with a multichannel interface. The characteristics of background activity resulted from airborne radon progeny were investigated. The background activity in a well ventilated workroom was relatively low and equilibrated in 3-4 h after the start of sampling. Moreover, it was affected by the change of atmospheric pressure. The minimum detectable activity for <SUP>32</SUP>P with the system was estimated to be 2.3×10<SUP>-5</SUP> Bq cm<SUP>-3</SUP> for 10 min measurement, which was less than 1/10 of the limit of airborne radioactivity concentration. The system is suggested to be more suitable than the conventional methods for the monitoring of airborne radioactive materials in the working environment.
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