Kandarakis I, Cavouras D, Panayiotakis G, Agelis T, Nomicos C, Giakoumakis G
Department of Medical Instrumentation Technology, Technological Educational Institution of Athens, Greece.
Phys Med Biol. 1996 Feb;41(2):297-307. doi: 10.1088/0031-9155/41/2/007.
Absolute efficiency and modulation transfer function of laboratory prepared La2O2S:Tb phosphor screens of various coating thickness were studied. Detailed experimental data on the variation of absolute efficiency with x-ray tube voltage up to 200 kVp and screen coating thickness in transmission and reflection observation mode are given. Data were compared with similar results from other rare earth phosphor materials. Theoretical calculations were in good agreement with experimental data to permit estimation of intrinsic efficiency and coefficients related to light scattering and absorption within the phosphor material. The MTF of La2O2S:Tb screens was also experimentally and theoretically evaluated.
研究了实验室制备的不同涂层厚度的La2O2S:Tb磷光屏的绝对效率和调制传递函数。给出了在透射和反射观察模式下，绝对效率随X射线管电压高达200 kVp以及屏涂层厚度变化的详细实验数据。将数据与其他稀土磷光材料的类似结果进行了比较。理论计算与实验数据吻合良好，从而能够估计本征效率以及与磷光材料内光散射和吸收相关的系数。还对La2O2S:Tb屏的调制传递函数进行了实验和理论评估。
