Background: Plain X-Ray, Computed Tomography, and Magnetic Resonance Imaging is a common procedure performed on a regular basis for diagnostic purposes all over them world. The use of Plain X-Ray, Computed Tomography, and Magnetic Resonance Imaging is increasing rapidly with the introduction of new radiation-oriented therapeutic practices. Although it carries significant diagnostic benefits, extensive exposure to Plain X-Ray, Computed Tomography, and Magnetic Resonance Imaging has been shown to be associated with multiple dose-dependent health risks. Awareness and knowledge among patients regarding the effects of X-ray imaging, therefore, becomes important. Through this study, use of radiation, Plain X-Ray, Computed Tomography, and Magnetic Resonance Imaging medical imaging for diagnostic and interventional purposes has risen dramatically in recent years with a concomitant increase in exposure of Physicians and health workers to radiation hazards. Aim of the study: To assessment the knowledge of Risks Associated with the Use of Plain X-Ray, Computed Tomography, and Magnetic Resonance Imaging among emergency Physicians and health care working in X-Ray department in Public Sector Tertiary Hospitals at Saudi Arabia 2022. Methods: This cross-sectional study was conducted among 300 participants from Public Sector Tertiary Hospitals kingdom of Saudi Arabia. A validated self-administered questionnaire was used, emergency Physicians and health care working in X-Ray, Computed Tomography, and Magnetic Resonance Imaging department It includes questions on socio demographic variables, knowledge of Risks Associated with the Use about radiations imaging , during the August to September 2022. Results: shows the majority of participant (44.0%) have high of the knowledge towards risks Associated with the Use of Plain X-Ray, Computed Tomography, and Magnetic Resonance Imaging followed by (37.0%) of participant average but weak were (19.0%) while Range(6 -15) . Conclusion: The emergency Physicians and health care working in the public sector tertiary care hospitals of Saudi Arabia seem to lack the knowledge of Risks Associated with the Use of Plain X-Ray, Computed Tomography, and Magnetic Resonance Imaging regarding the hazards of radiations and the necessary safety measures required to be undertaken during radiations imaging.