A radiation therapist is standing 34 cm from a radioactive source, which is resulting in an exposure rate of 11.5 mR/hour. To reduce the exposure rate to 0.05 mR/hour, at what distance must the therapist be standing? 

Calculate the monitor units for each portal of an AP/PA abdomen with a 12 cm x 16 cm field with an SSD of 100 cm, treated to midplane to a depth of 7 cm. The collimator scatter factor is 1.08, the phantom scatter factor is 1.007, the percentage depth dose is 76%, the tumor target is 180 cGy. 

EXTRA CREDIT: To avoid exceeding the dose limits to the kidneys, which of the following techniques can be employed to threat the pancreas?

What margins are added to the target to account for range uncertainties when using a particle beam? 

BrainLab is the use of

Which if the following is created at the end of a beam that is created by a cyclotron? 

EXTRA CREDIT: The force between two charged particles is called the

Cone beam computed tomography differs from fan beam computed tomography in that the detector is

EXTRA CREDIT: The gallbladder is normally found by its attachment to the ventral surface of the   

Name the flat, thin structure at the arrow.