Abstract
A new concept of thermodynamic particle size is introduced in the latest ICRP respiratory tract model. The rapid sizing system was developed for practical use. For example, the system would be useful in unfolding the attaching process of radon progeny to ambient aerosols and in testing a collection performance of an air filter. In order to shorten the measurement time in a screen-type diffusion battery (SDB), various configurations to a SDB were evaluated. A measuring system using a condensation nucleus counter (CNC) was optimised to give a quick response for particle counting. The optimisation minimised the measurement time for each stage of the SDB to only 6 s, so that the total time for a single measurement was shortened to 66 s for a diffusion cell consisting of 11 stages. This measurement time of 66 s was almost equivalent to the shortest scanning time of 60 s for TSI's scanning mobility particle sizer (SMPS). For aerosol samples with concentrations below 60 particles.cm 3 at the final stage of the SDB, more time is necessary due to statistical fluctuations in particle counting.
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