A secondary electron that is produced that can cause further ionization is a called a

If the activity in a sample of a radionuclide is 225 mCi, how many half-lives would be required for it to decay to less than 0.5 mCi?

Field separation can be accomplished either dosimetrically or geometrically. Which of the following best describes dosimetric field separation? 

The use of cone-beam computed tomography imaging for isocenter verification uses what type of algorithm to reconstruct volumetric images? 

A radiation therapist is standing 28 cm from a radioactive source, which is resulting in an exposure rate of 9 mR/hour. In order to reduce the exposure rate to 0.06 mR/hour, at what distance must the therapist be standing?

The Paris System of brachytherapy planning applies to the use of

EXTRA CREDIT: Which of the following is a nonspecific daily physical assessment side effect of a cancer patient? 

EXTRA CREDIT: In a neutral atom, the electrical neutrality is achieved by maintaining a balance between the 

EXTRA CREDIT: Which of the following are pulse radiation detectors?

Calculate the minimum skin gap between field A which has a SSD of 105 cm with a field size of 6 x 12 cm and field B with a field size of 7 x 14 cm and an SSD of 110 cm. The depth of match is 8 cm. What is the skin gap?