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The light localizing collimator must confine the x-ray beam within +/- __________ of the SID.

A secondary protective barrier must have a lead equivalency of approximately:

The major structural elements of a eukaryotic cytoskeleton include (select all that apply):

The radiation unit used to measure biologic damage is what?

Fixed radiographic units have a short or fixed exposure switch to help insure that the operator:

Radiation that leaves the tube housing in any direction other than towards the patient is called: 

The lower the HVL of a material, the more effective it is at blocking x-rays.

A radiation therapist was exposed to 45 mGy of proton radiation to the skin of his hands (Wt = 0.1). What is the therapists effective dose?

Reproducibility cannot exceed:

Which of the following would not be considered background radiation?