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用实验室方法测定粉末样品、桶状标准源及模型中的或埋藏地点的射气扩散系数时,均须将矿石密封,以保证镭氡之间达到平衡。在进行此种测定的实际工作中,特别是在利用模型和桶状标准源时以及在埋藏地点密封矿体露头时,在矿石和封闭面之间会产生一个自由空隙,这种空隙是由于被粉碎矿石的沉降或由于坑道壁上矿段表面不平所造成的。由于空隙的存在,由矿石中扩散出来的射气将充填于此空隙中;在此情况下,所形成的氡衰变产物的沉降数量将与自由空隙的容积和该空隙中的射气浓度成正
Laboratory determination of powder samples, barrel standard sources and model or burial sites, the radio diffusivity, the ore must be sealed to ensure the balance between radium radon. In the practical work of carrying out such determination, a free void is created between the ore and the enclosed surface, particularly when using model and barrel standard sources and when sealing the ore body outcrop at burial sites, Subsidence of crushed ore or due to the uneven surface of the mine section caused by the mine. Because of the presence of voids, the emanated air from the ore will fill the voids; in this case, the amount of settling of radon decay products formed will be proportional to the volume of free voids and to the concentration of the emanating gas in the voids