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[en] One of the important route of radiation exposure to man is through inhalation of air containing radioisotopes. A major contribution to inhalation dose comes from radon, thoron and its progenies. The indoor radon and thoron progeny levels are determined by two count method. In this method the radon and thoron progenies are collected on a glass fiber filter paper using volume air sampler (Staplex) and counted for alpha activity in ZnS (Ag) alpha counting system. It is observed that thoron working level is higher than the radon working level in all houses except few houses with stone walls and mosaic floor. Behavior of indoor radon and thoron working levels for different seasons at different houses are determined and discussed in detail. Radon and thoron working levels are measured high in winter, autumn, and low in summer and rainy seasons. Among all seasons highest value is measured in winter and low in summer and rainy seasons. Radon progeny working level varies from 1.659 to 6.675 mWL, whereas thoron progeny working level varies from 1.670 to 12.671 mWL. The geometric mean values of radon and thoron progeny concentration in the present study are 2.836 and 4.133 mWL. The high thoron progeny level observed in this is attributed to the high thorium content observed in soils of this area. (author)
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Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, Prague (Czech Republic); International Radiation Physics Society (International Organisation without Location); 340 p; ISBN 80-01-02180-7; 
; 2000; p. 288; 8. international symposium on radiation physics (ISRP-8); Prague (Czech Republic); 5-9 Jun 2000; Also available on CD-ROM, data in PDF format for the Acrobat Reader; contact: Professor L. Musilek, Faculty of Nuclear Sciences and Physical Engineering, Brehova ul., CZ-11519 Prague 1, e-mail: musilek@br.fjfi.cvut.cz. In addition, the file can be downloaded from the web site: www.fjfi.cvut.cz/ISRP-8.htm; The abstract in the publication is identical with that reproduced below
; 2000; p. 288; 8. international symposium on radiation physics (ISRP-8); Prague (Czech Republic); 5-9 Jun 2000; Also available on CD-ROM, data in PDF format for the Acrobat Reader; contact: Professor L. Musilek, Faculty of Nuclear Sciences and Physical Engineering, Brehova ul., CZ-11519 Prague 1, e-mail: musilek@br.fjfi.cvut.cz. In addition, the file can be downloaded from the web site: www.fjfi.cvut.cz/ISRP-8.htm; The abstract in the publication is identical with that reproduced below