Question 2604
{"accessible":false,"alternatives":[{"id":12778,"text":"10% rhenium alloy on anode surface"},{"id":12779,"text":"aluminum reinforced actual focal spot"},{"id":12780,"text":"cooling oil"},{"id":12781,"text":"reducing tube current"},{"id":12782,"text":"rotating anode"}],"archived":false,"correctAlternativeId":12779,"explanation":"\u003cp\u003eHeat is produced at the anode when electrons strike the anode (having been accelerated from the cathode). The anode needs to be able to tolerate this heat. Various properties ensure heat tolerance.\u003c/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cp\u003eAnode is made of tungsten which has a high melting point\u003c/p\u003e\u003c/li\u003e\n\u003cli\u003e\u003cp\u003eThe anode can rotate to dissipate the heat over a larger surface area (focal track)\u003c/p\u003e\u003c/li\u003e\n\u003cli\u003e\u003cp\u003e10% rhenium is added to the surface of the anode to prevent surface cracking\u003c/p\u003e\u003c/li\u003e\n\u003cli\u003e\u003cp\u003eHeat is removed via radiation to surrounding cooling oil and tube housing\u003c/p\u003e\u003c/li\u003e\n\u003cli\u003e\u003cp\u003eThe anode stem conducts heat away from the actual focal spot\u003c/p\u003e\u003c/li\u003e\n\u003cli\u003e\u003cp\u003eReducing the tube current (both kVp and mA) will reduce heat producting at the anode\u003c/p\u003e\u003c/li\u003e\n\u003c/ul\u003e","id":2604,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2737","nextQuestionPath":"/articles/anode-x-ray-tube/questions/2603","relatedArticles":[{"id":29771,"title":"Focal spot","link":"/articles/focal-spot?lang=us"}],"alsoUsedIn":[{"id":1551,"kind":"RestrictedPage","title":"Page 1551 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/1551"},{"id":1995,"kind":"Course","title":"Imaging Physics: X-ray peer review - page 1995","link":"https://radiopaedia.org/courses/imaging-physics-x-ray-peer-review/pages/1995"},{"id":1995,"kind":"Course","title":"Imaging Physics: X-ray - page 1995","link":"https://radiopaedia.org/courses/imaging-physics-x-ray/pages/1995"}],"stem":"\u003cp\u003eWhich of the following does \u003cstrong\u003eNOT \u003c/strong\u003eimprove heat tolerance at the anode?\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/2604"}],"attemptsPercentages":[{"alternativeId":"12781","percentage":17},{"alternativeId":"12779","percentage":67},{"alternativeId":"12778","percentage":8},{"alternativeId":"12782","percentage":2},{"alternativeId":"12780","percentage":5}],"promptToLogin":false,"questionManager":false,"articleId":"anode-x-ray-tube"}