Research on Calibration Method for On-line Radiation Monitoring of γ-ray Source

Abstract

In the on-line radiation monitoring of γ -ray source, the active online monitoring module can realize real-time recording of the radiation dose equivalent value and count rate in the detector. Because the amount of radiation at different measuring points is different, their values vary from place to place, so there is no exact value that is completely suitable for all kinds of measurement situations, so the nonlinear relationship between counting rate and dose rate is deduced. For the difference of the dose at the measuring point, the relationship between them will increase with the continuous accumulation of radiation dose, which will have an impact on the iterative algorithm. In this paper, the LM algorithm is used to solve the fitting function model, and the feasibility of the algorithm is verified by MATLAB software programming. The results show that the parameters of the objective function model can be obtained by the LM algorithm, and the relative error of the eighth polynomial can be minimized and a better fitting effect can be achieved.