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Which of the following are true with regard to X-ray photon production? a. The area of a continuous spectrum graph represents the total output of all X-ray photons emitted as a result of characteristic radiation b. Increasing the tube voltage (kV) results in the continuous spectrum shifting to the right and the line spectrum increasing in heightc. One-quarter of the photons from Bremsstrahlung radiation that reach the patient are less than 20 keV d. Increasing the filament voltage causes Bremsstrahlung and characteristic radiation graphs to increase in height e. Reducing the filament voltage has no effect on the maximum photon energy produced by characteristic or Bremsstrahlung radiation |
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Answer» a. False. The area of a continuous spectrum graph represents the total output of X-ray photons emitted as a result of Bremsstrahlung radiation, not characteristic radiation. b. True. Increasing the tube voltage increases the frequency of photon production as a result of characteristic radiation; however, it does not influence photon energy, which is dependent on the target material. Photons produced by Bremsstrahlung radiation increase in both their frequency and energy (keV). c. False. Photons with an energy of less than 20 keV are absorbed by the glass tube and do not reach the patient. d. True. Increasing the filament voltage increases the number of electrons colliding with the target material causing an increase in the number of photons produced by both characteristic and Bremsstrahlung radiation. e. True. Filament voltage does not influence photon energy in either characteristic or Bremsstrahlung radiation. |
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