Methods: The chamber dosimeter and phantom of plexiglass were used to measure the dose on the parts of the accelerator table plank,the dosage declined by the table planks was calculated.

• 方法:利用电离室剂量仪和有机玻璃体模对加速器治疗床各部分进行测量,计算床面板对剂量的衰减情况。