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    STUDIA AMBIENTUM - Ediţia nr.1-2 din 2009  
         
  Articol:   PARALLEL RADON AND THORON SURVEY AT SPECIAL UNDERGROUND CIRCUMSTANCES.

Autori:  TIBOR KOVÁCS, NORBERT KÁVÁSI, CSABA NÉMETH, JÁNOS SOMLAI, TAMÁS VIGH, GÁBOR SZEILER. 		 
       
         
  Rezumat:  In this study a comparative integrating radon and thoron survey executed at underground workplaces are discussed. Two types of solid state nuclear track detectors (Radopot and Raduet) including CR-39 were placed at four sites including a manganese mine, a bauxite mine, a show (tourist) cave and a hospital cave. Several numbers of detecting points were chosen at each site and 1-1 Raduet and Radopot detector were placed at each point. Both detector types contains two polycarbonate (CR-39) foil in different holders in order to determinate the radon as well as the thoron levels. The detectors were changed in 30-60 days periods and the survey continued for a year. The aims of this study. To gain information about the radon and thoron concentrations. To compare the performance of the two types of detectors and check their response in the special circumstances indicates by these underground places. There was not considerable difference between the radon results provided by the two types of detectors. In the case of thoron the results are very variable and significant part of the detectors provides no data or unrealistic data. The study suggests that both types of detectors are fit for the integrating radon measurement. The reason of the unreliability of the thoron measurement could be the high humidity (especially in the caves), the high aerosol concentration (especially in the mines) and the air change rate variation.

Keywords: radon; underground workplaces; radiation dose; dose estimation 		 
         
     
         
         
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