高气压井型电离室γ核素活度测量装置

Well-type High Pressure lonization Chamber for Accurate Measurement of y Activity

本文介绍γ射线活度精密测量用高气压井型电离室及电测系统。整个电离室由不锈钢制成,上下底部为椭圆球面形,并用同轴绝缘子代替两个绝缘子,简化了结构。考虑到对低能γ射线的响应,在设计上采取了特殊措施。测定了电离空的性能,与国外同类仪器相比,有较高的效率,能区宽,本底低,漏气率较小。

This paper describes the assemble for accurate measurement of r activity, i.e well-type high pressure ionization chamber and an electric system. The chamber is made of stainless steel, keeps straight well-type structure, the top and bottom of which are in ellipsoid style with an axial ratio of 2:1. Coaxial insulator instead of two separate insulators is used, simplifying structure of the chamber and improving its sensitive volume. Special measures have been adopted in consideration of low energy r ray response. The experimental data obtained were compared with the theorit-cial values. 13 kinds of r emitter are calibrated. The performance of the chamber is compared with foreign products. The chambers has high effice?ncy,wide energy range, low background and littie gas leak.The total unce rtainty of ionization current is 0.09%.