放射線管理区域室内におけるエアロゾルの性状

抄録

The number concentration and size distribution of aerosol particles are the most important factors determining their behaviour. The number concentration and the size distribution of particles were measured with a condensation nuclei counter (CNC) and a light scattering particle counter (PC) or an electrical aerosol size analyzer (EAA), respectively, under the various ventilation conditions. The measurements were done in the Kyoto University Reactor (KUR), the Kyoto University Critical Assembly (KUCA) and the Institute of Atomic Energy, Kyoto University (KUTAE). The particle number concentration in the room increased by ventilation air introduced from outside of the building. The size distribution in the room was very close to the Junge distribution having the mean diameter of 0.02-0.06μm. The particle number concentration was lowest in the KUCA whose ventilation system is a circulation mode.