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Which of the following increase X-ray beam intensity at a given point from a source? a. Increasing the filter thickness b. Increasing the tube current c. Increasing the distance d. Increasing the tube voltage e. Reducing the atomic number of the target materia |
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Answer» a. False. This results in more photoelectric absorption of the low-energy photons and therefore a reduction in the total energy per unit area passing through per unit time (beam intensity). b. True. Increasing the tube current results in increased numbers of electrons colliding with the target and therefore increasing the number of photons produced by both characteristic and Bremsstrahlung radiation. c. False. According to the inverse square law, beam intensity is inversely proportional to distance, as long as the radiation is from a point source and there is no absorption or scatter. d. True. Increasing the tube voltage results in an increase in the kinetic energy of electrons colliding with the target, resulting in an increase in photon beam intensity. e. False. |
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