Radiation Health & SafetyQuestion 19 of 100
Aluminum filtration is placed in the path of the x-ray beam in order to:
a.Restrict the size and shape of the beam
b.Increase the number of photons reaching the receptor
c.Remove low-energy, non-diagnostic photons that would be absorbed by the patient
d.Convert x-rays into visible light
Explanation
Aluminum filters absorb long-wavelength, low-energy photons that cannot reach the receptor and would only be absorbed by the patient's skin, so filtration lowers patient dose. Restricting beam size and shape is the job of collimation, not filtration. Filtration reduces rather than increases photon numbers, and converting x-rays to light is the function of intensifying screens and phosphor plates.
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