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Abstract
In this study, the analysis of radon activity concentration in 11 types of rock samples has been carried out using a radon monitoring system which consists of long-tube technique equipped with CR-39 SSNTDs as a passive method and electronic RAD7 solid-state detector as an active method. The rock samples were collected from different mountainous areas in Erbil and Sulaymaniyah Governorate in Iraqi Kurdistan Region. Results shows that the range of activity concentrations of radon, effective radium content, surface exhalation rates, and mass exhalation rates of 222Rn in rock samples are 32.21–56.34 Bq.m−3, 0.28–0.54 Bq.kg−1, 1.78–3.12 Bq.m−2.d−1, and 0.051–0.098 Bq.kg−1.d−1, respectively. The indoor annual effective dose (AED) due to radon gas inhalation released from rock samples was estimated and ranged from 0.18 to 1.42 mSv.y−1. The obtained data of the indoor annual effective dose due to inhalation of radon gas from rock samples in Heran 2 (red), Siktan 1 (green), Siktan 2 (red), Hizop (green), Koya (yellow), and Jalli 1 (yellow) locations exceeded the safe limit 1.2 mSv.y−1 as reported in UNSCEAR 2000; WHO 2008.
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