摘要：SummaryIn this study, a portable radioactive plume monitor using a silicon photodiode was developed for the detection of a radioactive plume (e.g.131I,134Cs and137Cs) in an emergency situation. It was found that the background count rate was proportional to ambient dose equivalent rate and the detection limit for the monitor at 20μSvh−1as an ambient dose equivalent rate was evaluated to be 187Bqm−3using the ISO11929 method. These results suggest that the detection limit for the system can be decreased effectively by lead shielding with optimized thickness.
关键词：Radioactive plume;Continuous air sampling;Silicon photodiode;Detection limit
