低能X射线标准辐射场下背散射因子的测量与研究

Measurement and Research of the Backscatter Factors in Low Energy X-ray Standard Radiation Field

在40 ～60 kV的治疗水平辐射质下,对背散射因子进行了测量实验研究.所测得的背散射因子可用于相同条件下的水吸收剂量的计算.实验结果显示,在不同模体厚度下,随着模体厚度的增加,测量点处的背散射因子呈现先增大后稳定的趋势;在不同辐射野下,随着辐射野面积的增大,测量点处的背散射因子呈现增大的趋势.

The value of X-ray backscatter factors(BSFs) with the tube voltage from 40 kV to 60 kV in the low energy X-ray standard radiation field is measured and researched.Along with the increase of the thickness of the phantoms,the value of the BSFs is increasing then becoming stable.With the enlargement of radiation field area,the value of the BSFs shows the tendency of increase.