Abstract：The main features of the plastic scintillator-type car-borne radioactive detection system was introduced. Through the combination of theoretical model and experiment, the measurement feasibility and estimation measurement method of the minimum detectable activity (MDA) were studied. The results showed that: (1) when estimating the MDA of the plastic scintillator-type car-borne radioactive detection system, the activity response should be measured within 20m from the car body; (2) The relationship between the reference activity response and the distance x is a two-element addition model, from which the minimum detectable activity at a specific location can be estimated or minimum detectable distance of the Car-borne radioactivity detection system can be estimated if the reference source activity is known. The MDA estimation method established by the research can provide reference for the technical performance evaluation and application of the plastic scintillator-type car-borne radioactive detection system.
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2020, Vol. 41 
