Cosma C, Dancea F, Jurcut T, Ristoiu D
Faculty of Physics, Babes-Bolyai University, Cluj-Napoca, Romania.
Appl Radiat Isot. 2001 Mar;54(3):467-73. doi: 10.1016/s0969-8043(00)00286-4.
In this paper we present a laboratory method for the determination of diffusion coefficient, D, as well as the 222Rn emanation fraction, f, in concrete core samples. It is based either on the analyses of the growth curves of the radon in the air volume surrounding a sample enclosed in an accumulation chamber (Lucas cell or RADIM device) or using the charcoal adsorption method. Samples used have a special geometry allowing the assumption of a one-dimensional diffusion of radon in material. Radium was enhanced in the concrete samples by adding radium bromide solution or uranium ore. A strong dependence of the emanation fraction on the enhancing method was observed. For the sample enhanced with uranium ore the specific exhalation rate was about ten times smaller. A marked dependence of radon exhalation on the water content was also observed.
在本文中，我们介绍了一种用于测定混凝土芯样中扩散系数D以及222Rn析出率f的实验室方法。该方法基于对封闭在累积室（卢卡斯室或RADIM装置）中的样品周围空气中氡的生长曲线的分析，或者使用木炭吸附法。所使用的样品具有特殊的几何形状，使得可以假定氡在材料中进行一维扩散。通过添加溴化镭溶液或铀矿石来提高混凝土样品中的镭含量。观察到析出率对增强方法有很强的依赖性。对于用铀矿石增强的样品，比析出率约小十倍。还观察到氡析出对含水量有明显的依赖性。
