title: [Lesson 9. Source of radiation].
authors.affiliation: Research-and-Practical Center of Medical Radiology, Moscow.
authors.forename: E G
authors.initials: EG
authors.lastname: Chikirdin
mesh_terms: D006282:Health Personnel / Q000193:education; D011859:Radiography / Q000295:instrumentation*; D013679:Technology, Radiologic / Q000193:education; D000078329:Workforce; D014965:X-Rays