2014 Med Phys I Lecture 3.2c PreTest Question Title * 1. Name: Question Title * 2. Which factor distinguishes S(double bar) from other averages? It incorporates the average energy of delta rays produced by hard collisions. It incorporates the changing stopping power of a single electron. It incorporates the stopping power of many electrons created by a monoenergetic beam. It incorporates the stopping power of many electrons created by a polyenergetic beam. Question Title * 3. When considering the total mean stopping power, we average spectrum over all except electrons from a polyenergetic beam. electrons from a monoenergetic beam single electrons electrons created in medium Question Title * 4. For restricted stopping power, what is the maximum amount of initial energy that an electron can lose? 1/4 1/2 3/4 all Question Title * 5. The restricted stopping power differs from the unrestricted stopping power because it takes into account: the photon spectrum from a polyenergetic beam the energy deposited at a distance due to Bremmstrahlung from the secondary electrons the spectrum of secondary electrons due to photon interactions the slowing down spectrum of the electron Question Title * 6. Why is it necessary to have a triple average of stopping power? Triplet production necessitates the averaging of the energy of the three particles involved. When considering stopping powers in regions of bone, fat, and muscle. When considering electrons produced from apolyenergetic photon beam. Question Title * 7. Are there any issues that are not clear to you at this time? Done