Regarding the multiple beam alignment check, which of the following are general causes of beam misalignment? I.      Focal spot displacement II.     asymmetry of collimator jaws III.    Displacement in the collimotor rotation axis or the gantry rotation axis  

Varying the beam size and shape utilizing multi-leaf collimators during treatment is known as which of the following?

What is BEV? 

To interact by photoelectric effect, the interacting photon must have energy:

A port film is taken at 130 cm from the source.  The irradiated field measures 16 x 16 cm on the imager.  What does this field size measure at the isocenter?

The initial activity for a particular isotope is 150 mCi.  After 29 days, the activity is 128.7 mCi.  What percentage of the isotope is left after the 29 days?

When treating with photons, the carousel rotates to place a _________________ in the beam for a uniform beam across the field.

The intensity of a radioactive beam is measured at a distance of 100 cm and found to be 290 mR/min.  What will be the intensity of this beam at a distance of 110 cm?

In treatments using kilovoltage equipment, filters are used to ___________________.

Bragg peak is: