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    STUDIA AMBIENTUM - Issue no. 1-2 / 2009  
         
  Article:   INVESTIGATION OF RADON AND THORON IN DWELLINGS NEARBY A CLOSED HUNGARIAN URANIUM MINE.

Authors:  CSABA NÉMETH, NORBERT KÁVÁSI, JÁNOS SOMLAI, VIKTOR JOBBÁGY, TIBOR KOVÁCS. 		 
       
         
  Abstract:  Radon (222Rn) and thoron (220Rn) integrated measurements were executed in a Hungarian a village, located in vicinity of an abandoned uranium mine. The applied passive radon and thoron monitor were the RADUET which based on CR-39. The investigated 43 houses were one storey buildings made of bricks. The rock under the village is gray-sandstone with 136 and 77 Bq kg-1 average uranium and thorium contents respectively. The detectors were mostly placed in the inhabited areas of the houses, such as bedrooms and living-rooms, at a height of 1-1.5 m close to the wall. The measurement periods were between December 2006 – May 2007 and May 2007 – February 2008. Annual averages of radon concentrations were calculated applying seasonal correction factors to the results of the two measurement periods. The results show that the radon concentrations in case of considerably part of the investigated dwellings seems to be significantly higher (data are under evaluation) than the Hungarian averages for ground-floor houses (152 Bq m-3). The thoron concentrations in some case are also not negligible indicating that radon measurements which are sensitive to thoron can be misleading. Additionally, thoron also can be a contributor of extra dose.

Keywords: dwellings; uranium mine; radon; thoron
  
         
     
         
         
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