Mosby - QA Qs

Question 1

Which of the following should be checked on a linac daily?
A. light/radiation field coincidence
B. beam flatness and symmetry
C. field size indicators
D. none of the above

Answer 1

D. none of the above

Rationale:
All of the above parameters are to be checked monthly.

Question 2

The mass attenuation coefficient (μ/ρ):
A. is independent of density
B. is dependent on density
C. has no relationship with linear attenuation coefficient
D. is independent of absorber thickness
E. none of the above

Answer 2

A. is independent of density

Rationale:
Mass attenuation coefficient (μ/ρ) is found by dividing μ by the density, making μ/ρ independent of density.