Pressyanov D, Georgiev S, Dimitrova I, Mitev K, Boshkova T
Faculty of Physics, University of Sofia St. Kliment Ohridski, 5 James Bourchier Blvd, 1164 Sofia, Bulgaria.
Radiat Prot Dosimetry. 2011 May;145(2-3):123-6. doi: 10.1093/rpd/ncr069. Epub 2011 Apr 5.
This paper describes a method for determination of the diffusion coefficient and the solubility of radon in plastics. The method is based on the absorption and desorption of radon in plastics. Firstly, plastic specimens are exposed for controlled time to referent (222)Rn concentrations. After exposure, the activity of the specimens is followed by HPGe gamma spectrometry. Using the mathematical algorithm described in this report and the decrease of activity as a function of time, the diffusion coefficient can be determined. In addition, if the referent (222)Rn concentration during the exposure is known, the solubility of radon can be determined. The algorithm has been experimentally applied for different plastics. The results show that this approach allows the specified quantities to be determined with a rather high accuracy-depending on the quality of the counting equipment, it can be better than 10 %.
本文描述了一种测定氡在塑料中的扩散系数和溶解度的方法。该方法基于氡在塑料中的吸收和解吸。首先，将塑料样品在受控时间内暴露于参考（222）Rn浓度下。暴露后，通过HPGeγ能谱法跟踪样品的活度。使用本报告中描述的数学算法以及活度随时间的降低情况，可以确定扩散系数。此外，如果已知暴露期间的参考（222）Rn浓度，则可以确定氡的溶解度。该算法已在不同塑料上进行了实验应用。结果表明，这种方法能够以相当高的精度确定指定的量——取决于计数设备的质量，精度可优于10%。
