The annual dose equivalent limit to the heart for occupationally exposed individuals is ____ mSv.

If the dose rate is 250 cGy/min at 100 cm from the source, what is the dose rate at 140 cm from the source?

Calculate the collimator rotation required for a lateral brain field of a CSI treatment with the following parameters:brain field length = 19 cmbrain SAD = 100spine field length = 32 cmspine SSD = 110

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.