SENSITIVITY OF A COMBINED CHARCOAL AND ETCHED TRACK TECHNIQUE FOR RN-222

To describe the radon detection process of a Hew radon dosemeter, whic h is based on the simultaneous utilisation of activated charcoal and C R-39 etched track detector, a simple model was formulated. The depende nce of the response of the dosemeter on exposure time, irradiation tim e of the detector foil, thickness of the charcoal layer, diffusion and the adsorption coefficients of radon in charcoal was calculated. The theoretical model was verified by experiments. It was found that for a short (one hour) exposure to a radon atmosphere the response can be a s high as similar to 900 tracks.cm(-2).(kBq.m(-3))(-1).