Question 1685
{"accessible":true,"alternatives":[{"id":8381,"text":"coherent scattering"},{"id":8382,"text":"Compton scatter"},{"id":8383,"text":"photoelectric effect"},{"id":8384,"text":"pair production"}],"archived":false,"correctAlternativeId":8381,"explanation":"\u003cp\u003eCoherent scattering is one of three forms of photon interaction which occurs when the energy of the x-ray or gamma photon is small in relation to the ionisation energy of the atom. It, therefore, occurs with low energy radiation.\u003c/p\u003e\u003cp\u003eUpon interacting with the attenuating medium, the incident photon does not have enough energy to liberate the electron from its bound state so no energy transfer occurs. There is no energy deposition and thus no dose resulting from coherent scattering. The only change is a change of direction (scatter) of the photon, hence 'unmodified' scatter. Coherent scattering is not a major interaction process encountered in radiography at the energies normally used.\u003c/p\u003e","id":1685,"imageUrl":"https://prod-images-static.radiopaedia.org/multiple_choice_questions/184/Photoelectric_and_compton.012_big_gallery.jpeg","imageAttribution":{"kind":"case","rID":80801},"imageAttributionCaseInfo":{"title":"Types of photo-atom interaction - diagrams","contributor_name":"Frank Gaillard","contributor_param":"frank","case_rid":80801,"case_param":"types-of-photo-atom-interaction-diagrams"},"firstQuestionPath":"/questions/2748","nextQuestionPath":"/articles/compton-effect/questions/1684","relatedArticles":[{"id":29684,"title":"Photoelectric effect","link":"/articles/photoelectric-effect?lang=gb"},{"id":31689,"title":"Coherent scattering","link":"/articles/coherent-scattering?lang=gb"},{"id":31661,"title":"Pair production","link":"/articles/pair-production?lang=gb"}],"alsoUsedIn":[{"id":1346,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1346","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1346"},{"id":1200,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1200","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1200"},{"id":248,"kind":"LiveSchedule","title":"248","link":"https://radiopaedia.org/admin/live_schedules/248"},{"id":158,"kind":"LiveSchedule","title":"158","link":"https://radiopaedia.org/admin/live_schedules/158"},{"id":1284,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1284","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1284"},{"id":1284,"kind":"Course","title":"Imaging Physics Lectures - page 1284","link":"https://radiopaedia.org/courses/imaging-physics-lectures/pages/1284"}],"stem":"\u003cp\u003eThe accompanying diagram best depicts which phenomenon?\u0026nbsp;\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/1685"}],"attemptsPercentages":[{"alternativeId":"8383","percentage":16},{"alternativeId":"8384","percentage":3},{"alternativeId":"8381","percentage":59},{"alternativeId":"8382","percentage":23}],"promptToLogin":false,"questionManager":false,"articleId":"compton-effect"}