X(γ)刀吸收剂量测量方法研究

A method study on absorbed dose determination of X(γ) knife

利用自制的直径f160mm有机玻璃球形模体和能够插入球形模体中心的PTW31006型0.015cm3尖点电离室测量了3种X(g)刀的等中心处不同辐射野的吸收剂量,并与半导体探测器(灵敏体积为1mm2?.5mm)的测量数据进行了比对,对电离室和半导体探测器的不同适用范围进行了分析,给出了一种适合X(g)刀的吸收剂量测量方法。

In this paper described is the absorbed dose deternination of three types X(g) knives at isocenter point in different radiation fields by using a 160-mm diameter PMMA spherical phantom and a 0.015cm3 PTW 31006 type pinpoint ionization chamber which can be inserted into the center of the phantom. The measured data were compared with those measured by a semiconductor detector (with sensitive volume of 1mm?mm?.5mm). A comparative study on the applicability of the two detectors was carried out, and a method suitable for the absorbed dose determination of X(g) knife was put forward.