Problem 10: 3.3 TVIs would equal how many HVLs? Problem 11: For the same dose, which type of radiation likely kills most cells? A. Alpha B. Beta C. X-Ray D. Gamma-Ray Problem 12: A photon source is incident upon two thin shields. The first shield attenuates 40% of the beam and the second shield attenuates 60% of the beam. What percent of the incident photon beam is attenuated? Problem 13: The current US regulatory dose limit (mSv) for the annual effective dose to radiation workers is: Problem 14: Potassium !"!"A is a naturally occurring radioisotope that decays by beta musemission. Therefore, the daughter atom: A. Has a mass of approximately 19 amu B. Has 19 neutrons C. Has 40 nucleons D. Has 90 protons