Miners annual exposure and the outlet air

The air in all underground mines is contaminated by radioactive gas radon. The presence of it is the potential danger for the health of workers expressed as an annual exposure. Authors were searching for a new strategy which can average the air contamination's level and which is simple in use. The proposed strategy bases on measurements in the outlet air streams in the mines. These streams are sum of many local streams, so they carry information on average radiation in the air in the workposts. The idea of the method is to correlate parameters of the contamination distribution measured in the outlet air streams with the appropriate parameters of the contamination distribution measured in the workplaces. It was proved that the geometric mean obtained from the measurements in the outlet air can be correlated with the geometric mean and the geometric standard deviation of the measurement distribution obtained in the workplaces. The determination coefficient is equal to 0.89 and 0.59 respectively. (author). 12 refs, 3 tabs, 6 figs