1. Radiotherapy Department, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
2. National Institute of Metrology, Beijing 100029, China
Abstract A simple and effective method of the half-value layer (HVL) measurement becomes more and more important increase with the number of X-ray equipment. Penelope was used to simulate the energy deposition of LiF(Mg, Cu, P) thermoluminescence dosimeters in N80 (65 keV), N100 (83 keV), N150 (118 keV), N200 (164 keV) heavy filtered narrow-spectrum irradiation fields with different copper thickness, the HVL of X-ray machine was obtained by analysis and calculation, the HVL of LiF X-ray machine with narrow spectrum standard irradiation field of N100 (83 keV) at 3 m was measured experimentally to verify the simulation program. The results showed that for the low energy N80 (65 keV), N100 (83 keV) irradiation field, LiF dosimeter is feasible to measure the half value layer of X-ray, it was not recommended to use the thermoluminescence to measure the half-value layer in N150 (118 keV), N200 (164 keV) irradiation field, because of the simulation results have large relative errors with the values obtained by the ionization method.
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2021, Vol. 42 
