A Continuous Sampler With Background Suppression For Monitoring Alpha-emitting Aerosol Particles

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Abstract
A continuous air monitor has been developed that includes provisions for improving the detection of alphaemitting aerosol particles in the presence of radon/thoron progeny that are unattached to ambient aerosol particles. Wind tunnel tests show that 80% of 10-wm aerodynamic equivalent diameter particles penetrate the flow system from the ambient air to the collection filter when the flow rate is 57 L min −1 (2 cfm) and the wind speed is 1 m s −1. Uniformity of aerosol collection on the filter, as characterized by the coefficient of variation of the areal density deposits, is 218Po was removed by an inlet screen that is designed to collect radon daughters that are in the size range of molecular clusters. The inlet screen offers the opportunity to improve the signal-to-noise ratio of energy spectra in the regions of interest (subranges of the energy spectrum) of transuranic elements and thereby enhance the performance of background compensation algorithms.

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