Rahman Naureen Mahbub, Iida Takao, Saito Fumihiro, Koarashi Jun, Yamasaki Keizou, Yamazawa Hiromi, Moriizumi Jun
Energy Environmental Safety Engineering Laboratory, Department of Energy Engineering and Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 Japan.
Radiat Prot Dosimetry. 2007;123(2):171-81. doi: 10.1093/rpd/ncl106. Epub 2006 Aug 25.
The activity-size distribution of radon decay products are normally determined using two approaches: direct and indirect. The present study utilises the direct approach to evaluate sizing information of a low pressure cascade impactor using imaging plate (IP) technique for radon decay products. The experiment verified the use of the collection media as suggested by the manufacturer of impactor and proposed a few improvements toward sizing characteristics of impactor. The obtained relative activity-size distribution of radon decay products presents a sharp unimodal log-normal distribution of the particle characterised by activity median aerodynamic diameter (AMAD) of 268 nm and geometric standard deviation (sigma(g)) of 1.66. The obtained data with all the suggested improvements were evaluated by the data obtained from a scanning mobility particle sizer (SMPS, Model 3934, TSI Inc), as reference data. The verification lead to a derivative area ratio of 0.803 between the reference and experimental data.
氡衰变产物的活度-粒径分布通常采用两种方法来确定：直接法和间接法。本研究采用直接法，利用成像板（IP）技术评估用于氡衰变产物的低压级联冲击器的粒径信息。实验验证了冲击器制造商建议的收集介质的使用，并针对冲击器的粒径特性提出了一些改进建议。所获得的氡衰变产物的相对活度-粒径分布呈现出颗粒的尖锐单峰对数正态分布，其活度中值空气动力学直径（AMAD）为268 nm，几何标准偏差（sigma(g)）为1.66。将所有建议改进后获得的数据与扫描迁移率粒径谱仪（SMPS，型号3934，TSI公司）获得的数据作为参考数据进行评估。验证得出参考数据与实验数据之间的衍生面积比为0.803。
