2015 Med Phys I Lecture 2.3a PreTest Question Title * 1. Name: Question Title * 2. Which process produces the least amount of x-rays? Interaction with outer shell electrons Interaction with K-shell electrons Interaction with the nucleus Question Title * 3. The quantity of radiation produced by an X-ray tube is proportional to Potential difference Tube Current Heat of filament Question Title * 4. A cloud of electrons in equilibrium surrounding the tungsten filament of an x-ray tube prevents the tube current from increasing in direct response to the filament current in the: Low tube voltage region. Mid tube voltage region. High tube voltage region. Tube current always increases with filament current. Question Title * 5. When an electron produces x-rays through interaction with the nucleus, which of the following processes is responsible? The electron collides with the nucleus and excites it. X-rays result from the de-excitation of the nucleus. The electron collides with the nucleus and liberates a core nucleon. When an outer nucleon falls into the hole left behind an x-ray is given off. The electron is deflected by the nucleus through the electron cloud surrounding the nucleus resulting in many collisions that result in x-rays. The electron is deflected by the nucleus and the deceleration causes x-rays to be given off. Question Title * 6. The radiation produced when a 6 MV beam hits the tungsten target in a treatment linear accelerator is: Gamma rays Characteristic Xrays Bremsstrahlung Question Title * 7. Are there any issues that are not clear to you at this time? Done