Abstract
The determination of the long-term dispersion of radon from large area sources is quite simple if a great number of passive radon dosemeters is used for the measurement integrating over rather long periods. Development work on, and testing of, small dosemeters for individual dosimetry and outdoor measurements which started about 10 years ago have led to a reliable measuring device, which can be applied also under extreme environmental conditions. The plotting of the concentrations distribution which is necessary to calculate the radiation exposure caused by radon in the vicinity of large sources has been demonstrated among others for the uranium mines at Menzenschwand and the milling facility at Ellweiler. The methodology and the most important parameters influencing the distribution of radon are discussed.
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