Smj Mortazavi1, Sar Mortazavi2, Maryam Paknahad3. 1. Professor of Medical Physics, Ionizing and Non-ionizing Radiation Protection Research Center (INIRPRC), Shiraz University of Medical Sciences, Shiraz, Iran. 2. Medical Student, Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran. 3. Assistant Professor of Oral and Maxillofacial Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. paknahadmaryam@yahoo.com.