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Concerning factors affecting absorption and scatter of X-rays: a. An increase in the density of a material results in an increase in the linear attenuation coefficient (LAC) b. Increasing the atomic number of a material increases its half-value layer (HVL) c. Reducing the tube voltage increases the LAC d. Increasing the filament voltage reduces the HVL of a material e. A narrow beam has a higher scatter-to-transmission ratio than a wide beam |
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Answer» a. True. An increase in density results in a higher probability that a photon will interact with an electron as it passes through the material. b. False. An increase in atomic number results in a higher probability that a photon will interact with an electron (photoelectric effect) as it passes through the material and hence reduces the HVL. c. True. A reduction in tube voltage results in reduced photon energy, which means it is more likely to get attenuated as it passes through the material. d. False. Filament voltage increases the number of photons but not photon energy. e. False. A narrow beam results in a smaller amount of scatter. |
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