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1061 Radiology

Half value layer refers to

AThe rate at which an X-ray photon transfer its energy to irradiated matter
BThe thickness of a substance required to reduce the number of X-ray photons by half
CThe time taken for X-ray photons to travel half the distance from the source to the object
DThe heel-effect seen when the anode is placed at an angle to the electron stream in the X-ray cathode tube
Radiology
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