Low-activity Gamma Source Direction Detection System Based on NaI Scintillator Detector

A system consisting of two NaI scintillators and 316L steel shield for low-activity gamma source directional detection is designed, and several calibration methods for different directional accuracy requirements are pro-posed. It is found that the direction parameter obtained by repeated simulation process under the same condition is equivalent to the sampling in a normal distribution. Thus, a neural network confidence evaluation method, which provides a new idea for the evaluation of low-activity gamma source directional detection system, is innovatively proposed. A quantitative analysis process of radiation background effect based on signal-to-noise ratio is introduced. Compared with previous results, it is found that the proposed detection system configura-tion has evident advantages.