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我们采用IC/2C(1.0MPa),IG12/A20高气压井型电离室作为互检的γ放射性核素活度测量标准装置。它的建立,将确保γ放射性核素活度量值的统一和传递的准确可靠。我们选用的电离室具有合适的灵敏度、对源位置变化的依赖小和近似线性响应等优点。装置的微电流测量系统采用汤逊补偿的办法,具有测量精密度高、快速等优点,整套装置由微机实现自动控制、获取与处理数据,操作简便。典型本底电流为0.05pA,
We use IC / 2C (1.0MPa), IG12 / A20 high-pressure well-type ionization chamber as a standard device for measuring γ-radionuclide activity. Its establishment will ensure the unification and transmission of gamma radionuclide activity values accurately and reliably. The ionization chamber we choose has the advantages of appropriate sensitivity, small dependency on the change of source position and approximate linear response. The micro-current measurement system of the device adopts the method of Thomson compensation, which has the advantages of high measurement precision and rapidity. The entire device is automatically controlled by a microcomputer to obtain and process data and is easy to operate. Typical background current is 0.05pA,