linac audit

Question 1

What methods can we audit a linac

Answer 1

water tank
beam geometry
measure x-ray field
ion chamber
alignment block

Question 2

why is water chosen to measure dose?

Answer 2

as the human body is aqueous

water has a uniform density

cheap

Question 3

……….. ……… is when the collimators are not in the right position

Answer 3

step-out