Which term describes the radiation that travels from the tubehead directly toward the patient before it strikes any tissue?

Giải thích

Primary radiation is the useful beam that exits the tubehead and travels toward the patient before interacting with matter. Secondary radiation is created when the primary beam strikes tissue, and scatter is secondary radiation deflected in all directions. Leakage radiation escapes through the tubehead housing rather than through the opening and should be negligible in a properly maintained unit.