Evaluation of annual effective dose from indoor radon concentration in Eastern Province, Dammam, Saudi Arabia

The aim of this study is to determine the indoor radon concentration and to evaluate the annual effective dose received by the inhabitants in Dammam, Al-Khobar, and compare it with new premises built at university of dammam. The research has been carried out by using active detection method; Electronic Radon Detector (RAD-7) a solid state a-detector with its special accessories. The indoor radon concentration measured varies from 10.2 Bqm(-3) to 25.8 Bqm(-3) with an average value of 18.8 Bqm(-3) and 19.7 Bqm-3 to 23.5 Bqm(-3) with an average value of 21.7 Bqm(-3), in Dammam and Al-khobar dwellings, respectively. In university of dammam the radon concentration varies from 7.4 Bqm(-3) to 15.8 Bqm(-3) with an average value of 9.02 Bqm(-3). The values of annual effective doses were found to be 0.47mSv/y, 0.55mSv/y, and 0.23mSv/y, in Dammam, Al-khobar and university new premises, respectively. The average radon concentration in the old dwellings was two times compared to that in the new premises and it was 25.4 Bqm(-3) lower than the world average value of 40 Bqm(-3) reported by the UNSCEAR. The annual effective doses in the old dwellings was found to be (0.55mSv/y) two times the doses received at the new premises, and below the world wide average of 1.15mSv/y reported by ICRP (2010). The indoor radon concentration in the study region is safe as far as health hazard is concerned.