2017 Med Phys I Lecture 3.1e/f PreTest Question Title * 1. Name: Question Title * 2. Pair production is dependent on Z Z^2 Z^3 it is independent of Z Question Title * 3. Which of the following statements regarding electron interactions and imaging is false? Photoelectric effect has good Z contrast so image quality is good Compton effect has poor Z contrast so image quality is poor The annihilation photons from pair production have good Z contrast so image quality is good. Question Title * 4. In Pair Production, the portion of the incident photon energy that is converted to a scattered photon is: 100% 50% 25% 0% Question Title * 5. The pair production attenuation coefficient for 3 MeV incident photons does what as Z of the attenuating material increases? Increases Decreases Stays the same Does not exist Question Title * 6. There is a slight asymmetry that results in the distribution of kinetic energy that favors more energy being given to the positron than the electron in pair production. This is a result of Conservation of momentum Conservation of energy Electrostatic force of the nucleus Electrostatic force of the created electron Question Title * 7. Are there any issues that are not clear to you at this time? Done