Using the x-ray spectra from Figure 2.11(a) (tungsten anode) and 2.12(b) (molybd
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Question
Using the x-ray spectra from Figure 2.11(a) (tungsten anode) and 2.12(b) (molybdenum anode) both pictured below: At what energy does the most intense characteristic x-ray energy occur for tungsten keV? for molybdenum keV? What are the mass attenuation coefficient values for iodine at those two energies? Use the x-ray mass attenuation coefficient data provided on table 3 found on http: //physics.nist.gov/PhysRefData/XrayMassCoef/tab3.html mu/rho = cm^2/g for tungsten maximum energy. mu/rho = cm^2/g for molybdenum maximum energy. Which anode type would be better suited for x-ray angiography using iodine as a contrast agent?Explanation / Answer
From the figures
For tungsten, the most intense charachteristic xrays happen at about 60 keV
For molybdenum, the most intense charachteristic xrays happen at about 19 keV
From the table, mu/rho at 0.06 MeV for inodine is about 9 cm^2/g
From the table, mu/rho at 0.019 MeV for iodine is about 10 cm^2/g
so attenuation coefficent of iodene is lesser for the peak photon energy for tungsten
so tungsten would be a better anode with iodine as constrat agent
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