便携式氡析出率自动测量仪研究

发布时间：2018-11-08 19:55

【摘要】：氡析出率的可靠测量是环境氡污染治理中的关键因素。活性炭吸附法和静电收集法是氡析出率测量的常用方法,活性炭吸附法适合于在温湿度相对稳定且氡析出率变化不太大的条件下使用,静电收集法能实现快速测量,但目前静电收集式测氡仪如RAD7需对测量的氡浓度进行数据修正才能得到氡析出率。为实现氡析出率的可靠测量,南华大学基于累积集氡和静电收集法测氡的方式研制了一种便携式氡析出率自动测量仪,该测量仪无需干燥管干燥取样的气体,减少了干燥剂对集氡罩内介质表面氡析出率的影响。在自然环境下,该测量仪能准确测量氡浓度,无需借助计算机进行线性拟合处理数据,由内置微处理器将线性拟合转化为代数运算后便能根据测量的氡浓度自动计算出氡析出率。实验表明,该氡析出率自动测量仪在氡析出率标准装置上的测量值与参考值的相对偏差在5%以内。测量完毕直接得出氡析出率,方便了现场氡析出率测量的需求。
[Abstract]:The reliable measurement of radon exhalation rate is a key factor in environmental radon pollution control. Activated carbon adsorption and electrostatic collection are common methods for measuring radon exhalation rate. Activated carbon adsorption method is suitable for the measurement of radon exhalation rate under the condition of relatively stable temperature and humidity and little change of radon exhalation rate. Electrostatic collection method can be used to measure radon exhalation rate quickly. But at present, the data of radon concentration measured by electrostatic collection radon meter such as RAD7 need to be corrected in order to get radon exhalation rate. In order to realize the reliable measurement of radon exhalation rate, a portable automatic radon exhalation measuring instrument was developed by South China University based on the method of accumulative radon collection and electrostatic collection. The effect of the desiccant on the radon exhalation rate on the surface of the media is reduced. In the natural environment, the instrument can accurately measure the radon concentration, without the help of the computer to carry out linear fitting processing data. The linear fitting can be transformed into algebraic operation by the built-in microprocessor, and the radon exhalation rate can be calculated automatically according to the measured radon concentration. The experimental results show that the relative deviation between the measured values and the reference values is less than 5%. The radon exhalation rate is obtained directly after measurement, which is convenient for the measurement of radon exhalation rate in the field.
【作者单位】：南华大学核科学技术学院;衡阳师范学院物理与电子工程学院;
【基金】：国家自然科学基金资助项目(11475082,11275096)
【分类号】：X859

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