Question 640
{"accessible":false,"alternatives":[{"id":3204,"text":"coherent scattering"},{"id":3201,"text":"Compton effect"},{"id":3205,"text":"pair production"},{"id":3202,"text":"photoelectric absorption"},{"id":3203,"text":"Rayleigh scatter"}],"archived":false,"correctAlternativeId":3202,"explanation":"\u003cp\u003eThe intensity of an x-ray beam is reduced as it passes through a material because of collisions between the x-ray photons and the atoms of the material. The beam is said to be attenuated because the collisions result in both the absorption and the scattering of photons. The main absorption process, the photoelectric effect\u0026nbsp;totally removes photons from the radiation beam and is utilized in filtration.\u003c/p\u003e\u003cp\u003eAdapted from\u0026nbsp;\u003ca href=\"https://en.wikibooks.org/wiki/Basic_Physics_of_Digital_Radiography\"\u003eBasic Physics of Digital Radiography\u003c/a\u003e\u0026nbsp;by\u0026nbsp;Kieran Maher,\u0026nbsp;with author's permission (License:\u0026nbsp;\u003ca href=\"https://creativecommons.org/licenses/by-sa/3.0/\"\u003eCreative Commons\u0026nbsp;BY-SA 3.0\u003c/a\u003e).\u003c/p\u003e","id":640,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2748","nextQuestionPath":"/articles/coherent-scattering/questions/636","relatedArticles":[{"id":8177,"title":"X-ray tube","link":"/articles/x-ray-tube-1?lang=us"},{"id":30308,"title":"Compton effect","link":"/articles/compton-effect?lang=us"},{"id":29684,"title":"Photoelectric effect","link":"/articles/photoelectric-effect?lang=us"},{"id":31661,"title":"Pair production","link":"/articles/pair-production?lang=us"},{"id":29737,"title":"Filters","link":"/articles/filters?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eWhen a filter is used to harden a diagnostic energy x-ray beam, it does so mainly by...\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/640"}],"attemptsPercentages":[{"alternativeId":"3202","percentage":68},{"alternativeId":"3204","percentage":11},{"alternativeId":"3203","percentage":4},{"alternativeId":"3205","percentage":3},{"alternativeId":"3201","percentage":15}],"promptToLogin":false,"questionManager":false,"articleId":"coherent-scattering"}