2015 Med Phys I Lecture 4.1c PreTest Question Title * 1. Name: Question Title * 2. A simple definition of charged particle equilibrium is The energy carried out by charged particles in a volume is equal to the energy carried in by charged particles. The mass of charged particles leaving a volume is equal to the mass of charged particles entering the volume. The number of charged particles leaving a volume is equal to the number of charged particles entering the volume. Question Title * 3. Which of the following is not a necessary condition for charged particle equilibrium? No inhomogeneous electric or magnetic fields are present. The medium is homogeneous in density and composition. The volume is smaller than the range of secondary electrons. There exists a uniform field of photons (i.e., there is negligible attenuation of photons). Question Title * 4. Under conditions of charged particle equilibrium, which of the following statements is true? Dose is equal to collision kerma. Dose is equal to kerma. The ratio of doses in two media is equal to the ratio of mass attenuation coefficients. Question Title * 5. According to Bragg-Gray Cavity Theory, the ratio of absorbed dose in the wall of a chamber to the absorbed dose in the gas inside the chamber is equal to the ratio of charged particle fluences the ratio of energy fluences the ratio of mass collisional stopping powers the ratio of mass energy transfer coefficients Question Title * 6. Spencer-Attix Theory is an improvement over Bragg-Gray Theory in that Spencer-Attix Theory explicitly accounts for absence of charged particle equilibrium non-uniform photon fields secondary electrons produced by electron-electron interactions the existence of inhomogeneous electric fields Question Title * 7. Are there any issues that are not clear to you at this time? Done