液体化学剂量计测定电子束吸收剂量

DOSE MEASUREMENTS WITH LIQUID CHEMICAL DOSIMETERS FOR ELECTRON BEAMS

用重铬酸钾（银）和硫酸高铈－硫酸铈剂量计对电子束（能量１－１５ＭｅＶ）的水中吸收剂量进行了测量，其剂量响应线性良好，准确度高，测量的扩展不确定度为４．８％（Ｋ＝２）。针对电子束吸收剂量测量的特点，特别设计加工了硬币型聚苯乙烯制容器。根据深度剂量分布曲线，计算了吸收介质中某一深度处的吸收剂量，并通过射程法的计算，对电子束最可几能量进行了估计。

The liquid chemical dosimeter systems including potassium (silver) dichromate and ceric cerous sulfate dosimeters are used to measure the absorbed dose for industrial 1-15 MeV electron beams. The uncertainties are about 4 8 % (K=2) .In order to meet the requirements of measuring the absorbed dose for electron beams, a kind of coin shape dosimeter container is especially designed. The E p(most probable energy) of the electron beams were calculated by ways of range measurement using the depth dose distribution curves. The liquid chemical dosimeters are also compared with the water calorimeters made by the China Institute of Engineering Physics from 5-40 kGy for 4-12 MeV electron beams. The agreements are better than 5 % at 95 % confidence level.