An Automated, Semicontinuous System for Measuring Indoor Radon Progeny Activity-Weighted Size Distributions,dp: 0.5–500 nm

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Abstract
A system for the detection and measurement of indoor radon progeny activity-weighted size distributions (particle size, d p > 0.5 nm) and concentration levels has been developed. The system is microcomputer-controlled and involves a combination of multiple wire screen (graded screen array) sampler-detector units operated in parallel. Determining the radioactivity associated with the aerosol sampled in these units permits semicontinuous measurement of the radon progeny activity-weighted size distributions and concentration levels. This study presents details of the system and describes various stages in its development including prototype design, experimental characterization in a radon-aerosol chamber, and numerical studies for optimization of the design and operating parameters. Results of field measurements in a residential environment are presented to illustrate the resolution, sensitivity, and capabilities of the measurement system.