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SOLVED: A gamma-camera system is used for both SPECT imaging (using ^99Tc^m ) and PET imaging of a tumour in the centre of the brain. Obtain an approximate estimate of the ratio of efficiencies of PET and SPECT imaging. Note that the overall efficiency depends on the attenuation of γ rays in the brain and skull, the transmission of rays to the detector and the detector efficiency.Information: Na(T 1) detector: radius r=7.5  cm, thickness x=1  cm . Brain: diameter =18  cm, skull thickness =1  cm

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