电离室型氚监测仪实验室校准技术
Calibration Technology of Ionization Chamber Tritium Monitor
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摘要: 电离室型氚监测仪是监测空气中氚气浓度水平最重要的在线监测设备，为解决国内流气式电离室型氚监测仪的量值传递问题，开展了电离室型氚监测仪校准技术研究。根据质量流量方法建立氚监测仪的实验室校准装置，通过控制充入校准装置标准氚气体积，采用稀释法配制校准用的参考氚气，用于对电离室型氚监测仪进行校准测试；同时在研制的实验室校准装置上开展校准过程影响因素对校准结果影响研究；采用实验室校准装置配制的参考氚气浓度的扩展不确定度为3.2%～3.6%（k=2）；SP1400氚监测仪对活度浓度为3.10×103~1.98×105 Bq/L范围内氚气响应线性良好（r2=0.999 3），校准因子为0.97，标准合成不确定度为 4.3%~5.0%。氚监测仪实验室校准装置可配制不同活度浓度的氚气，对氚监测仪进行校准操作性较好，易于推广，准确度高。Abstract: The ionization chamber tritium monitor is the most important online monitoring equipment for monitoring the concentration of tritium in the air. In order to solve the problem of quantity value transmission, the calibration technology of ionization chamber tritium monitor was studied. The laboratory calibration device of tritium monitor is established according to the mass flow method. The reference tritium gas for calibration is diluted and prepared by controlling the volume of standard tritium gas filled into the calibration device. The prepared reference tritium gas is used to calibrate the ionization chamber tritium monitor. At the same time, the influence factors of the calibration process on the calibration results are studied on the developed laboratory calibration device; the expanded uncertainty of reference tritium gas concentration prepared by laboratory calibration device is 3.2%-3.6%(k=2); when tritium activity concentration is 3.10×103-1.98×105 Bq/L, the response linearity of SP1400 tritium monitor to tritium gas activity is good(r2=0.999 3), the calibration factor is 0.97, and the standard synthetic uncertainty is 4.3%-5.0%. The laboratory calibration device of tritium monitor can prepare tritium gas with different activity concentrations. The calibration method is simple to operate and easy to popularize, which can meet the needs of tritium monitor calibration.
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[1] 杨怀元.我国核设施与环境氚的监测[J].辐射防护通讯，1994，14(3):4-14. [2] 洪永侠，程瑛，漆明森,等.气载氚监测仪现场校准技术[J].核化学与放射化学,2016，38（1）：38-42. [3] 洪永侠，吴甜甜，程瑛.气载氚监测仪校准技术研究[C].中国核学会2015年学术年会,2015,9月21—24日，绵阳.2015：11-15. [4] 吴甜甜，洪永侠，刘琢艺.便携式氚监测仪现场校准装置设计[J].科技视界,2020,5：79-81. [5] 冯梅，韦应靖，李德红,等.氚活度浓度标准装置的建立[J].辐射防护,2020，40（4）：271-276. [6] 深圳市计量检测研究院，福建省计量科学技术研究所.GB/T7165.5-2008气态排出流(放射性)活度连续测量监测设备[S].北京：中国标准出版社，2008. [7] Phillips H, Dean J. Good Practice Guide 114: the examination, testing and calibration of tritium-in-air monitors for radiation protection[S]. UK: National Physical Laboratory, 2015. [8] International Electrotechnical Commission. IEC 60761-5 equipment for continuous monitoring of radioactivity in gaseous effluents： specific requirements for tritium monitors[S]. UK: British Standrds Institute, 2002. [9] 李明，徐利军.一种氚监测仪实验室校准装置:中国,ZL 2019 1 1344069.5[P].2020-04-03. [10] 国家质量监督检验检疫总局.JJG619-2005PVTt法微小气体流量标准装置检定规程[S].北京:中国标准出版社，2005. [11] 郝光宗，刑丽缘，梁强威.饱和盐水溶液湿度固定点（1）：原理及制备[J].传感器世界,1999，11：1-4. [12] 陈志林.氚工艺系统中测量氚电离室基础问题研究[D].绵阳：中国工程物理研究院,2016. [13] 胡迭雨，张学森.高浓度氚测量中的记忆效应恢复技术研究[J].科技风，2018(1)：209-210. [14] 国家质量监督检验检疫总局.JJF1059.1-2012测量不确定度的评定与表示[S].北京：中国标准出版社，2013.
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