Question 646
{"accessible":false,"alternatives":[{"id":3233,"text":"1"},{"id":3234,"text":"2"},{"id":3235,"text":"5"},{"id":3236,"text":"10"},{"id":3237,"text":"20"},{"id":3926,"text":"50"}],"archived":false,"correctAlternativeId":3233,"explanation":"\u003cp\u003eEquivalent dose\u0026nbsp;is calculated by multiplying the absorbed dose to the organ or tissue (\u003cem\u003eD\u003c/em\u003e\u003cem\u003eT\u003c/em\u003e) with the radiation weighting factor (\u003cem\u003ewR\u003c/em\u003e). This factor is dependent on the type and energy of the incident radiation. The value of\u0026nbsp;\u003cem\u003ew\u003c/em\u003e\u003cem\u003eR\u003c/em\u003e\u0026nbsp;is 1 for x-rays, gamma rays and beta particles, but higher for protons (\u003cem\u003ew\u003c/em\u003e\u003cem\u003eR\u0026nbsp;\u003c/em\u003e=\u003cem\u003e\u0026nbsp;\u003c/em\u003e5), neutrons (\u003cem\u003ew\u003c/em\u003e\u003cem\u003eR\u0026nbsp;\u003c/em\u003eis between 5 and 20 depending on energy), alpha particles and heavy fragments (\u003cem\u003ew\u003c/em\u003e\u003cem\u003eR\u0026nbsp;\u003c/em\u003e=\u0026nbsp;20) etc.\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":646,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/646","nextQuestionPath":null,"relatedArticles":[{"id":5098,"title":"Equivalent dose","link":"/articles/equivalent-dose?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eWhat is the radiation weighting factor for x-rays for radiation protection purposes?\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/646"}],"attemptsPercentages":[{"alternativeId":"3237","percentage":3},{"alternativeId":"3233","percentage":84},{"alternativeId":"3236","percentage":4},{"alternativeId":"3235","percentage":5},{"alternativeId":"3234","percentage":4},{"alternativeId":"3926","percentage":1}],"promptToLogin":false,"questionManager":false,"articleId":"tissue-weighting-factor"}