Investigation of indoor radon levels in some dwellings of southwestern Nigeria.

The radon level of some selected dwellings of southwestern Nigeria was investigated using CR-39 detectors. Seventy 6.25 cm2size detectors were distributed to 70 homes randomly within two states of southwestern Nigeria for between three and four months, after which chemical etching and counting were carried out. Concentration values ranged from 5 to 255 Bq/m3, and the average radon concentration measured in the dwellings under study was 39 ± 7 Bq/m3. A mean annual effective dose rate of 1 mSv/y was determined for the selected dwellings. It was concluded that the radiological health implications resulting from these values are very low or almost insignificant. [ABSTRACT FROM PUBLISHER]