Bikit I, Mrda D, Grujic S, Kozmidis-Luburic U
Department of Physics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 4, Novi Sad, Serbia.
Radiat Prot Dosimetry. 2011 May;145(2-3):184-8. doi: 10.1093/rpd/ncr055. Epub 2011 Apr 6.
The radon emanation and the granulation effect on the emanation rate of several building materials (ceramic plates, sand, red brick and siporex brick) with different (226)Ra concentrations were investigated. A ball mill was used to achieve different granulations of the materials. The particle size distributions were determined by a particle size analyser (Mastersizer 2000). The increase in the (222)Rn concentration inside a closed chamber (volume ≈5.4 × 10(-3) m(3)) due to emanation from each material with different granulations was measured by an alpha spectrometer (RAD7). Thus, time-dependent curves for radon concentrations were obtained. The highest radon emanation coefficient (27 %) was obtained for the siporex sample with the smallest grain size (0.34 µm). For the ceramic pads, the granulation effect was negligible and the emanation coefficient was very low (∼0.4 %). The strongest influence of granulation on the radon emanation rate was found for the siporex brick sample.
研究了不同镭 - 226浓度的几种建筑材料（陶瓷板、沙子、红砖和泡沫玻璃砖）的氡析出及颗粒度对析出率的影响。使用球磨机使材料达到不同的颗粒度。通过粒度分析仪（Mastersizer 2000）测定粒度分布。利用α能谱仪（RAD7）测量在封闭腔室（体积约为5.4×10⁻³立方米）内，由于不同颗粒度的每种材料析出而导致的氡 - 222浓度的增加。由此获得了氡浓度随时间变化的曲线。对于粒度最小（0.34微米）的泡沫玻璃样品，获得了最高的氡析出系数（27%）。对于陶瓷垫，颗粒度影响可忽略不计，析出系数非常低（约0.4%）。发现颗粒度对泡沫玻璃砖样品的氡析出率影响最大。
