How does the mass attenuation coefficient for pair production vary with the photon energy?
Added by Gonzalo S.
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The mass attenuation coefficient (Ī¼/Ļ) quantifies how easily a material can attenuate (weaken) a beam of photons, such as X-rays or gamma rays, and is dependent on the energy of the photons and the type of material. Show moreā¦
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Jake K.
1. Based on the principle of energy conservation would you expect to see pair-production from the 662 keV Ī³-ray? 2. Explain why there are very few counts for energies greater than 700 keV. 3. Explain why there is a broad range of energies resulting from the Compton scattering.
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Two x-ray images of the hand are shown. One corresponds to an x-ray beam with an effective energy of a) 140 keV and the other to an effective energy of b) 50 keV. Identify which is which, and the reasons for the differences in the image contrast and signal intensity. Mass attenuation coefficient (ĆĀ¼) (cm^2/g) Mass attenuation coefficient (ĆĀ¼) (cm^2/g) 10 (b) 10 (a) Compton 100 0.01 10 0.001 photoelectric 103050 7090110 130 150 X-ray energy (keV) 0.1 10 100 X-ray energy (keV) 1000 None of the above The attenuation coefficient does not give rise to contrast in x-ray imaging and is not energy dependent. At 50 keV, the attenuation coefficient is about the same between tissues and bone, showing no contrast, whereas at 140 keV, there is a greater difference between tissues, showing greater contrast. The attenuation coefficient gives rise to contrast in x-ray imaging and is energy dependent. At 50 keV, the attenuation coefficient is about the same between tissues and bone, showing no contrast, whereas at 140 keV, there is a greater difference between tissues, showing greater contrast. The attenuation coefficient gives rise to contrast in x-ray imaging and is energy dependent. At 140 keV, the attenuation coefficient is about the same between tissues and bone, showing no contrast, whereas at 50 keV, there is a greater difference between tissues, showing greater contrast.
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