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In addition to the workers in uranium mines, the staff of other underground mines, such as workers in underground phosphate mines, can be exposed to 222Rn and its progeny. In this study the individual radon progeny concentrations were measured in three Egyptian underground phosphate mines to estimate the occupational exposure of the workers at those sites. A filter method was used to measure individual radon progeny concentrations (218Po, 214Pb and 214Po). The reported mean values of radon progeny concentrations exceed the action levels which are recommended by ICRP 65 (1993). Based on the measured individual radon progeny concentrations (218Po, 214Pb and 214Po) in these mines, the annual effective dose for the workers has been calculated using the lung dose model of ICRP 66 (1994). According to the obtained results, some countermeasures were recommended in this study to minimise these exposure levels.

Samples of atmospheric aerosol particles collected at three sites of Debrecen city, were analyzed with respect to 15 elements by PIXE method. The center of the city has higher concentration values for most of the trace elements than the other places, indicating that the human activity plays an important role in increasing the total particulate mass of atmospheric aerosol. The concentrations measured are compared to some other results in published literatures.