OPTIMIZATION OF ELECTRET IONIZATION CHAMBERS FOR RADON DOSIMETRY ON THE BASIS OF A THEORETICAL-MODEL

Electret ionisation chambers for radon dosimetry have proven to be rel iable and advantageous for practical use. Further improvements are the oretically discussed in this paper. An optimum chamber shape has been designed using a model to calculate the radon response. The main param eters of such chambers are shown to depend on size. The computer simul ation provides information about changes in the electret charge distri bution during exposure and models the response as a function of the el ectret voltage. The model has been extended to the gamma response of t he chambers in order to minimise the influence of the background. The optimum size of electret ionisation chambers can be determined from th e results.