Arslano?lu and Bilgin (2007) this research was based on Doctors’ and intern doctors’ knowledge about patients’ ionizing radiation exposure doses during common radiological examinations. For the methodology process, they given questionnaire is included the radiation doses of routine radiological diagnostic procedures was administered to 177 doctors and intern doctors. They are from 3 university hospitals, and doctors from an education and research hospital, one dispensary, and 3 outpatient clinics. From results they assumed Most of the doctors and intern doctors underestimated real radiation doses and 93.1% of the participants underestimated the actual dose. This study demonstrated that the level of knowledge of the participants was inadequate.