Filtration is used to _______________.
A. Absorb low-energy photons
B. Absorb high-energy photons
C. Filtration should never be used
D. Restrict the useful beam
Answer:A
Filtration is used to _______________.
A. Absorb low-energy photons B. Absorb high-energy photons C. Filtration should never be used D. Restrict the useful beam