活性炭盒法检测建材氡析出率的影响因素研究

Study on the Factors Affecting the Radon Exhalation Rate of Building

采用活性炭盒法测量建筑工地常用的两种建筑材料(蒸压加气块和混凝土块)氡析出率值,分析其采样时间、样品前处理方式、样品尺寸对氡析出率测量值的影响。试验结果表明:建材的氡析出率值随着采样时间的延长有先增大后减小的趋势,混凝土块和蒸压加气块氡析出率的最佳采样时间分别为5d和6d;相对于保鲜膜来说, 3M电工绝缘胶带具有不易破损、包裹过程简单且密封效果好等优点,可以作为样品前处理的包裹材料使用;混凝土块的尺寸越小,测得的氡析出率值越低,但是如果把表面氡析出率换算成氡固有析出率值时,这种影响将会显著变小。

This paper uses the activated carbon box method to measure the radon exhalation rate values of two build? ing materials commonly used in construction sites, namely, autoclaved aerated blocks and concrete blocks. The paper also analyzes the effects of sampling time, sample pretreatment method and sample size on the measured value of radon precipitation rate.The test results show that the radon exhalation rate of building materials increases first and then decreases with the extension of sampling time,the optimal sampling time of concrete blocks and autoclaved aer? ated blocks is 5d and 6d respectively;Compared with preservative film, 3M electrical insulating tape has the advantages of not easy to break, simple wrapping process and good sealing effect, which can be used as a wrapping materi? al for sample pretreatment;The smaller the size of the concrete block, the lower the measured value of the radon exhalation rate, but when the surface radon exhalation rate is converted into the inherent radon exhalation rate value, the effect will be remarkably smaller.