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Concerning an X-ray beam: a. It reduces in equal quantities as it passes through material of equal thickness b. No matter how thick the material, it is not possible to completely absorb the primary X-ray beam c. Beam hardening results from a reduced number of photons being removed from the primary beam d. For a heterogeneous beam, the half-value layer (HVL) increases as the beam passes through the material e. Wearing lead gloves protects the operator’s fingers from the X-ray beam |
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Answer» a. False. This is only true for a mono-energetic beam. X-ray beams consist of photons with varying energies (poly-energetic). b. True. This is known as the exponential law. c. False. Beam hardening results from the low-energy photons being attenuated proportionally more than the high-energy photons as the beam travels through a material. d. True. As a result of beam hardening the penetrating power of the beam increases, resulting in an increase in the HVL. e. False. Protective equipment does not provide protection against the primary beam, only the attenuated rays. |
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