CAJ | 학술논문

氡及其子体是人类所受到的来自天然辐射的主要辐射照射源，近年来我国掺渣建材的广泛使用使得室内氡平均水平有所提高。建筑工程上的防护和减缓是降低室内氡的关键及低成本方法。GB50325-2010首次给出了建材氡析出率检测方法标准。其中主动抽气采集型测定建筑材料表面氡析出率步骤要求抽气采集容器的平均高度为0．5 m。论文通过数值模拟得到较高的高度有利于减少222 Rn测量中220 Rn的干扰，而且可以降低采气容器内的222 Rn浓度，减少反扩散效应。因此222 Rn的析出率可以利用低成本的仪器和简洁的计算得到。
동급기자체시인류소수도적래자천연복사적주요복사조사원，근년래아국참사건재적엄범사용사득실내동평균수평유소제고。건축공정상적방호화감완시강저실내동적관건급저성본방법。GB50325-2010수차급출료건재동석출솔검측방법표준。기중주동추기채집형측정건축재료표면동석출솔보취요구추기채집용기적평균고도위0．5 m。논문통과수치모의득도교고적고도유리우감소222 Rn측량중220 Rn적간우，이차가이강저채기용기내적222 Rn농도，감소반확산효응。인차222 Rn적석출솔가이이용저성본적의기화간길적계산득도。
The main radiation exposure from natural radiation sources for human are Radon and its daughters .In recent years , the widespread use of building materials mixed with slag make the average indoor radon level in -creased .The protection and mitigation on construction work are the key and low -cost method to reduce indoor radon.The average height of collection chamber is 0.5m required by the procedure of active drawing air type for measuring radon exhalation rates from building materials surface defined by GB 50325-2010 .In this paper , we find that higher height of the collection chamber can reduce the 220 Rn interference in 222 Rn measurements by nu-merical simulation;and also can decrease the 222 Rn concentration in the collection chamber to reduce the effect of back-diffusion.222 Rn exhalation rate can be obtained by low -cost equipment and simple calculations .