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If the half-value layer of cortical bone for positron generated gammas (511 keV) and average x-ray...

If the half-value layer of cortical bone for positron generated gammas (511 keV) and average x-ray CT energies (80 keV) are 38.8 and 17.3 mm, respectively, what is the ratio of tissue thicknesses needed in PET and CT to produce equal photon flux in both cases? What would the fractional attenuation (I/I0) be for 3 cm of cortical bone?

Science   Advanced-Physics   
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