<P> Electrons from the cathode collide with the anode material , usually tungsten , molybdenum or copper , and accelerate other electrons , ions and nuclei within the anode material . About 1 % of the energy generated is emitted / radiated , usually perpendicular to the path of the electron beam , as X-rays . The rest of the energy is released as heat . Over time , tungsten will be deposited from the target onto the interior surface of the tube , including the glass surface . This will slowly darken the tube and was thought to degrade the quality of the X-ray beam . Vaporized tungsten condenses on the inside of the envelope over the `` window '' and thus acts as an additional filter and decreases the tubes ability to radiate heat . Eventually , the tungsten deposit may become sufficiently conductive that at high enough voltages , arcing occurs . The arc will jump from the cathode to the tungsten deposit , and then to the anode . This arcing causes an effect called `` crazing '' on the interior glass of the X-ray window . As time goes on , the tube becomes unstable even at lower voltages , and must be replaced . At this point , the tube assembly ( also called the `` tube head '' ) is removed from the X-ray system , and replaced with a new tube assembly . The old tube assembly is shipped to a company that reloads it with a new X-ray tube . </P>
<P> Electrons from the cathode collide with the anode material , usually tungsten , molybdenum or copper , and accelerate other electrons , ions and nuclei within the anode material . About 1 % of the energy generated is emitted / radiated , usually perpendicular to the path of the electron beam , as X-rays . The rest of the energy is released as heat . Over time , tungsten will be deposited from the target onto the interior surface of the tube , including the glass surface . This will slowly darken the tube and was thought to degrade the quality of the X-ray beam . Vaporized tungsten condenses on the inside of the envelope over the `` window '' and thus acts as an additional filter and decreases the tubes ability to radiate heat . Eventually , the tungsten deposit may become sufficiently conductive that at high enough voltages , arcing occurs . The arc will jump from the cathode to the tungsten deposit , and then to the anode . This arcing causes an effect called `` crazing '' on the interior glass of the X-ray window . As time goes on , the tube becomes unstable even at lower voltages , and must be replaced . At this point , the tube assembly ( also called the `` tube head '' ) is removed from the X-ray system , and replaced with a new tube assembly . The old tube assembly is shipped to a company that reloads it with a new X-ray tube . </P>
where is radiation produced in the xray tube
where is radiation produced in the xray tube
the anode material
the anode material