The influence of the working conditions on the equilibrium factor F and the unattached fraction fp

We report on the influence of the working conditions on the dose estimation . Especially the equilibrium factor and the unattached fraction are influen ced by the working conditions. For instance in a cabinet-maker's shop the r adon concentration is strongly influenced by the ventilation system. The fa ctor F is influenced by dust-producing work processes. For a better knowled ge of the radon dosimetry it is also necessary to measure continuously and separately the unattached fraction of the radon progeny. We present first r esults obtained with a SARAD EQF 3020 monitor which contains three alpha de tector microsystems measuring radon in the air, attached radon daughters an d unattached radon daughters. The three components are measured quasicontin uously with a temporal resolution of 2 hours. The measuring range is 1 to 1 0 MBq/m(3) at a low detection limit of 0.1 Bq/m(3) equivalent radon concent ration. The system was tested in buildings, caves, mines, waterworks and ot her places. By using silicon microsystems with alpha detector, ADC, memory and logics-which are integrated on few chips-the costs for the production o f equipment are far lower than if produced by means of assembled individual components.