The Radamon radon detector and an example of application

The etched track type Radamon radon detector is presented. As an example of application representative indoor radon survey was performed in Gyergyorem ete (Romania) to pilot a study that can be done in other places of the coun try. Gyergyoremete was selected, because it was built on volcanic rock, whe re a number of aligning mineral water springs indicates the existence of ge ological faulting, and therefore, it was suspected that the village could b e on a radon prone area. Measurements were done in sleeping rooms at pillow level. Representativity of the sample was ensured by random pull of 120 ho uses from the stock (hypergeometric statistical model). From the results it can be stated that the percentages of houses expected to have annual avera ge Rn-222 activity concentration higher than 400 Bq m(-3) is less than 1%. (C) 2001 Elsevier Science Ltd. All rights reserved.