MODIFIED DOUBLE FILTER METHOD FOR THE MEASUREMENT OF RADON OR THORON IN AIR

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Abstract
The double filter method has been widely used for measuring the concentration of radon or thoron in air. The method consists of letting the filtered air into a cylindrical tube and collecting the decay products formed inside the tube on a filter paper at the exit. A significant portion of the decay products deposit on the wall. In the present modification, aerosol particles are let into the tube near the periphery. These scavenge and bring the decay products on to the end filter thus preventing their deposition on the wall. The modified method improves the sensitivity, allows low flow rate sampling and can be considered as absolute, since nearly 95% of all the decay products formed inside the decay tube are collected on the end filter. This method has a potential for the measurement of the low levels of radon found in the environment.

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