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Shabana, E. , Tayeb, M. , Qutub, M. , Kinsara, A.. "Radon-222 Concentration and Potential Risk to Workers of Al-Jalamid Phosphate Mines, North Province, Saudi Arabia". World Academy of Science, Engineering and Technology, Open Science Index 118, International Journal of Medical and Health Sciences (2016), 10(10), 518 - 521.