Question 2744
{"accessible":false,"alternatives":[{"id":13396,"text":"0%"},{"id":13397,"text":"12.5%"},{"id":13398,"text":"25%"},{"id":13399,"text":"50%"},{"id":13400,"text":"75%"}],"archived":false,"correctAlternativeId":13398,"explanation":"\u003cp\u003e\u003cstrong\u003e\u003cem\u003e25%\u003c/em\u003e\u003c/strong\u003e\u003c/p\u003e\u003cp\u003eEach half value layer reduces the x-ray beam intensity by 50% (in a monoenergetic beam). In this example the beam has traveled a total of two half value layers.\u003c/p\u003e","id":2744,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2744","nextQuestionPath":"/articles/linear-attenuation-coefficient/questions/2743","relatedArticles":[{"id":22271,"title":"Half-value layer","link":"/articles/half-value-layer-1?lang=us"}],"alsoUsedIn":[{"id":1563,"kind":"RestrictedPage","title":"Page 1563 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/1563"},{"id":2007,"kind":"Course","title":"Imaging Physics: X-ray - page 2007","link":"https://radiopaedia.org/courses/imaging-physics-x-ray/pages/2007"},{"id":2007,"kind":"Course","title":"Imaging Physics: X-ray peer review - page 2007","link":"https://radiopaedia.org/courses/imaging-physics-x-ray-peer-review/pages/2007"}],"stem":"\u003cp\u003eThe half value layer of a monoenergetic beam for a particular tissue is 2cm. What percentage of the incident beam intensity will remain after it has traveled 4cm into the tissue?\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/2744"}],"attemptsPercentages":[{"alternativeId":"13399","percentage":5},{"alternativeId":"13397","percentage":3},{"alternativeId":"13396","percentage":2},{"alternativeId":"13400","percentage":4},{"alternativeId":"13398","percentage":86}],"promptToLogin":false,"questionManager":false,"articleId":"linear-attenuation-coefficient"}