2015 Med Phys I Lecture 3.2b PreTest Question Title * 1. Name: Question Title * 2. What is not a feature of a higher energy electron depth dose? higher surface dose greater range rapid fall off more Bremsstrahlung Question Title * 3. Why is the dose deposited greatest for the end of a charged particle’s path? The particle gets deflected back and forth over the same volume. There are more ionizations per unit path length. There is irreparable damage. Question Title * 4. Which of the following curves depicts a general shape that differs from the other three? Electron dose vs depth Electron dose vs path length Proton dose vs depth Proton dose vs path length Question Title * 5. What is the approximate range in water for an electron beam with energy 5 MeV? 1 cm 2.5 cm 5 cm 10 cm Question Title * 6. At higher energies, electron depth dose curves exhibit: Less scatter, less surface dose More scatter, less surface dose Less scatter, more surface dose More scatter, more surface dose Question Title * 7. Are there any issues that are not clear to you at this time? Done