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Which of the following are true regarding the linear attenuation coefficient (LAC)? a. The photoelectric LAC is directly proportional to photon energy b. The total LAC is dependent on the physical density of the material c. The Compton LAC is dependent on atomic number d. The photoelectric LAC increases as the atomic number increases e. The Compton LAC is dependent on the electron density |
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Answer» a. False. The probability that photoelectric absorption will occur decreases as the photon energy is reduced. b. True. Total LAC = Compton LAC + photoelectric LAC. The density of the material influences both types of attenuation. c. False. It is independent of the atomic number as it only involves interaction with free electrons. d. True. e. True. The probability that the Compton effect will occur is proportional to the physical density of the material, as well as to the electron density. |
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