Improved Apparatus for Obtaining Ionic Mobility Distributions of Radioactive Aerosols

Abstract

A new design for the measurement of the ionic mobility distributions of naturally occurring radioactive aerosols is described. The main features include novel means for obtaining the time variations of mobility distributions. The apparatus is a cylindrical aspiration chamber having an inner electrode consisting of a thin wall gas flow counter. The charged radioactive aerosols are trapped along the axis of electrodes by radial field between two concentric cylinders. The distribution of radioactivity deposited along the inner electrode are obtained by changing the effective length of the counter. The procedures of experiments and practical treatments of data analysis are described in this paper.