核电子学与探测技术

后处理工艺料液中铀浓度和硝酸浓度都是过程控制的重要数据,采用取样分析的方式存在分析效率低、辐射剂量风险等问题,因此本文提出了一种将γ吸收法测量铀浓度与电磁感应法测量硝酸浓度相结合的设计方案,研制了γ吸收探头、电导探头、数据解析软件、数采控制模块等组成的铀酸联合实时监测仪,以配制的铀-硝酸溶液吸光度和电导率数据为基础数据,使用最小二乘法对基础数据进行二维数据拟合,建立铀浓度、硝酸浓度、吸光度和电导率之间的数学模型。仪器研制完成后对其进行了性能测试,结果表明在铀浓度:30～350 g/L、硝酸浓度:1～4 mol/L范围内,铀浓度测量相对误差为1.2%(FS),硝酸浓度测量相对误差为2.6%(FS),且仪器具有良好的安全性能和抗干扰能力。

The rapid and accurate analysis of uranium concentration and nitric acid concentration is an important process control data in the post-process plant,and there are problems such as low analysis efficiency and radiation dose risk by sampling analysis,so this paper proposes a design scheme that combines the measurement of uranium concentration by γ absorption method with the measurement of nitric acid concentration by conductivity method.Based on the absorbance and conductivity data of the prepared uranium-nitricacid solution,the data fitting of the basic data is carried out by using the least squares method,and the mathematical model between uranium concentration,nitricacid concentration,absorbance and conductivity are established.After the development of the instrument,the performance test showed that in the range of uranium concentration:30～350 g/L and nitric acid concentration:1～4 mol/L,the measurement relative error of uranium concentration was 1.2%,the measurement relative error of nitric acid concentration was 2.6%,and the instrument had good safety performance and antiinterference ability.