1. Electron interactions were characterized by a ratio "b/a". The ratio "b/a" represents:

a) Orbital electron distance to nuclear radius

b) Photon wavelength to atomic radius

c) Impact parameter to atomic radius

d) Orbital electron radius to nuclear radius

2. The electron-electron interaction that results in brehmsstrahlung results when the ratio of the "Impact parameter to atomic radius is"

a) Much less than 1

b) Approximately equal to 1

c) Much more than 1

d) Non-existent

3. Which material would be the most appropriate for the target in the head of a linac based only on ability to produce brehmsstrahlung

a) Helium (Z = 2)

b) Sodium (Z = 11)

c) Iodine (Z - 53)

d) Tungsten (Z = 74)

4. Which class of dose calculation algorithm is the most accurate for radiation therapy?

a) Correction-based

b) Mode based

c) Monte Carlo

d) All of the above

5. Monte Carlo is

a) A city in Monaco

b) A way to solve tough problems using statistical sampling

c) An accurate but computationally-expensive way to simulate radiation transport

d) All of the above