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所建立的60Co水吸收剂量校准装置由300 mm×300 mm×300 mm的水箱(壁厚为15 mm,窗厚4 mm)、去离子水、抽吸水泵、储水水箱、三维移动平台、平台控制器、平台控制软件、电离室支撑件、防水型PTW30013电离室、电离电流测量装置、PTW剂量仪、温度传感器等组成,装置组成如图1所示。装置主要用途为:1)传递标准电离室和用户电离室60Co水吸收剂量校准;2)加速器输出剂量的日常检测;3)水吸收剂量测量不确定度分量的确定。
The established 60Co water absorbed dose calibration device consists of a 300 mm × 300 mm × 300 mm water tank (wall thickness 15 mm, window thickness 4 mm), deionized water, suction pump, water storage tank, three-dimensional mobile platform, platform Controller, platform control software, ionization chamber support, waterproof PTW30013 ionization chamber, ionization current measurement device, PTW dosimeter, temperature sensor and other components. The main purposes of the device are: 1) Calibration of absorbed dose of 60Co in standard ionization chamber and user ionization chamber; 2) Daily detection of accelerator output dose; and 3) Determination of the uncertainty component of measurement of water absorbed dose.