Minimum Detectable Activity for in-situ Gross Beta Measurement System in Ground Water

Abstract

Radionuclides generated from facilities of nuclear should be monitored quickly and accurately in terms of health physics. However, existing device such as a liquid scintillation counter (LSC) needs analysis and sampling times. Therefore, a measurement system using a plastic scintillator was developed for in-situ beta measurement system, which can save time and money compared to conventional methods. From this paper, the minimum detectable activity (MDA) values were calculated according to the degree of amplifier amplification of the system by flowing the sample directly from the collection region through the pump to the detection part. The study also found that the time required to reach the target MDA decreased with increasing amplifier amplification.