Abstract
A sensitive discriminative radon and thoron detector is described. The detector consists of a spindle-box and 2 DVDs. One DVD (DVD-1) is fixed on the base, inside the spindle, with the sensitive surface overlooking air volume. Another DVD (DVD-2) is mounted at the outer side of the base of the spindle, with the sensitive surface looking to the exterior. After exposure, the disks are etched electrochemically: DVD-1 on the surface while DVD-2 at depth of 64 µm. At such arrangement, DVD-1 is mostly sensitive to radon whereas DVD-2 - to thoron. The detector was calibrated by exposures to reference radon and thoron concentrations. Numerical estimates showed that for 3 months of exposure the limits of detection achievable are < 0.3 Bq m−3 for radon and < 2 Bq m−3 for thoron. The high sensitivity and simple design make such detector useful for monitoring of environmental radon and thoron levels.
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