Measurement of radon concentration in private houses in the eastern part of Al-Qaseem province of Saudi Arabia

CR-39 solid state nuclear track detectors were used to measure radon concentration in a city in the eastern part of Al-Qaseem province in Saudi Arabia The dosemeters were distributed over 58 houses. Results obtained show that the mean radon concentration in this area is 67 +/- 8 Bq.m(-3) which is higher than the level reported in former studies in other parts of the country, but is still within normal limits. It is also found that, in general, the level in lower floors is higher than that in upper ones in all houses. It is believed that the high radon level in this part of the country may be attributed to its geographic location.