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A survey of indoor radiation in Hungarian homes has been carried out by measuring the radon concentration and the dose rate from external sources in a thousand dwellings using electret radon detectors (E-PERM) and thermoluminescence dosemeters (CaSO4:Tm). The measurements were performed in one year during 1993-1994. The resulting arithmetic mean of radon concentration is 128 Bq.m-3, the weighted mean value is 107 Bq.m-3. The mean value of absorbed dose rate, including terrestrial and cosmic rays, is 127 nGy.h-1 and the weighted mean is 109 nGy.h-1. The annual effective dose to the Hungarian population based on the weighted means are 1.3 - 1.8 mSv from radon inhalation and 0.4 - 0.6 mSv from external sources, according to the occupancy of 5008-7008 hours per annum.
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I. Nikl (1996) studied this question.
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