3种无源固体探测器对低能X射线能量响应的研究

Energy dependence of three passive solid detectors on low energy X-ray

目的 研究3种无源固体探测器对低能X射线的能量响应,评估在乳腺X射线摄影检查中测量入射体表剂量和估算平均腺体剂量的可行性.方法 选用LiF（Mg,Ti）和LiF（Mg,Cu,P）热释光（TL）材料和Al2O3：C光致发光（OSL）材料的固体探测器,在Mo/Mo低能X射线机上,管电压25～40 kV范围的10种线质分别曝光相同的空气比释动能.结果 给出管电压在25 kV～40 kV范围的10种辐射线质时TL和OSL能量响应,分别小于25%和11%.结论 Al2O3：C光释光探测器用于乳腺X射线摄影日常质量控制和入射体表剂量测量具有相当大的潜力.

Objective To assess the feasibility of ESD measurements in the mammography by the comparative study of energy dependence of the three passive solid detectors on low energy X-ray.Methods Two thermoluminescent TL） detectors （ LiF（Mg,Ti） and LiF（ Mg,Cu, P） and one optically stimulated luminescence （OSL） detector（ Al2O3： C ） were irradiated for the same air kerma by ten kinds of beam quality between 25-40 kV in a Mo/Mo low energy X-ray generator,respectively. Results The energy dependences of TL and OSL were 25% and 11% between 25-40 kV, respectively. Conclusions considerable potential for OSL detector can be used in routine quality control and ESD measurements in the mammography.