Development of an aerosol chamber for calibration of Rn-220 progeny detectors

作者：Sorimachi Atsuyuki^*; Ishikawa Tetsuo; Tokonami Shinji

来源：Review of Scientific Instruments, 2014, 85(9): 095104.

DOI：10.1063/1.4894386

This paper describes an aerosol chamber system that can be used for calibrations and performance experiments of passive Rn-220 progeny detectors. For the purpose of this study, an aerosol generation system using carnauba wax as the aerosol material was mounted into the Rn-220 chamber. We used the chamber to measure characteristics of the equilibrium factor (F) of Rn-220 and unattached fraction (f(p)) of Rn-220 progeny, which are important parameters for dose estimation. The first experiment showed that continuous and stable generation of the unattached and aerosol-attached Rn-220 progeny concentrations was obtained. We observed that the spatial distributions in the chamber of the vertical profiles of the unattached and aerosol-attached Rn-220 progeny concentrations were homogeneous, as were the particle number concentration and count median diameter. The values of F and f(p) and their characteristics observed in this study were in the same range as the values reported from indoor measurements. We found that the characteristics of F and f(p) were dependent on the aerosol conditions (particle diameter and particle number concentration).

• 出版日期2014-9