For now, it is unlikely to think that developed industrial economies and high living standards can be maintained without using certain radiation sources which do not exist in nature. That is why human kind has needed to produce certain radiation sources in artificial ways as a necessity of technological development. In thepresent study, the aim is to determine the knowledge levels of students about the radiation dose being exposed to during some frequently-used radiological imaging techniques. The study group consisted of 90 students studying in Medical Imaging Techniques Program (TGTP) of Karadeniz Technical University VocationalSchool of Health Science in 2015-2016 spring and fall semesters. In this descriptive and cross-sectionalstudy, data were collected from the students practising in various hospitals between October 2015 and May 2016 via surveys. At the end of the study, it was revealed that there were knowledge deficiencies about the physical, chemical and biological changes caused by ionized radiation in human organism as well as protection from radiation.