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使用电离室 胶片和LiF剂量元件对国产医用直线加速器所产生的高能X线和β线作了与临床治疗直接有关的几个物理剂量参数的测试和计算,其结果如下。 1.X线能量确定 我们采用电离比值法和半值深度法测量X射线能量。 (1)电离比值法 用电离室在水体模中分别测得中心轴深度10cm和20cm处的电离量(J_(10)和J_(20)),然后由文献[1]求出最大光子能量。 (2)半值深度法 用电离室和胶片方法测得的8MeVX线中心轴D_d％曲线(见图1),二者平均误差<3％。测得的半峰值深度与HPA(医院物理学家协会)公布的深
The use of ionizing chamber film and LiF dose components for domestic medical linear accelerator generated by high-energy X-ray and β-line made with the clinical treatment of several direct physical dose parameters of the test and calculation, the results are as follows. 1.X line energy to determine We use the ionization ratio method and the half-depth method of measuring X-ray energy. (1) Ionization ratio method The ionization volumes (J_ (10) and J_ (20)) at the center axis of 10 cm and 20 cm were measured in a water phantom using an ionization chamber. The maximum photon energy . (2) The D_d% curve of the central axis of 8 MeVX line measured by the method of half-value depth using ionization chamber and film (see Figure 1), the average error of both is less than 3%. The measured half-peak depth is as deep as published by the HPA (Association of Hospital Physicists)