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Abstract
The ability of activated charcoal and alpha‐track radon monitors to estimate annual concentrations is a consequence of the measurement interval over which either type of monitor is used. In a case study of several hundred homes in Virginia and Maryland, a +/‐ 90% uncertainty must be applied to a single charcoal measurements to estimate the annual radon concentration, and a +/‐ 50% uncertainty must be applied to a three‐month alpha‐track measurement (90% confidence levels).