Bahr R, Nüsslin F
Strahlentherapie. 1979 Jul;155(7):481-5.
Measurements were carried out on a Clinac-18 linear accelerator in order to characterize the 10 MeV photon beam. Depth dose data and tissue-maximum-ratios were obtained for field sizes up to 35 x 35 cm2. Using a parabolic expression a least square fit to the tissue-maximum-ratios was performed. The radiation field flatness and the penumbra were found to be in good agreement with the tolerances recommended by the IEC standard (draft). The radiation field and the light field isocentre were determined as suggested by the IEC. The distance between both isocentres was less than 1 mm.
在一台Clinac - 18直线加速器上进行了测量，以表征10 MeV光子束。获得了最大35×35 cm²射野尺寸的深度剂量数据和组织最大剂量比。使用抛物线表达式对组织最大剂量比进行最小二乘拟合。发现辐射野平坦度和半值层与国际电工委员会标准（草案）推荐的公差吻合良好。按照国际电工委员会的建议确定了辐射野和光野等中心。两个等中心之间的距离小于1毫米。
