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Relative dose to tissue as a function of tissue mass density for 34 ICRU tissues from a 225 kV beam filtered by 4 mm of Al with <E> = 77 keV (a) and 0.5 mm of Cu with <E> = 92 keV (b). Tissues used in 4-tissue and 8-tissue model small animal dose calculations are plotted with filled symbols and vertical lines indicated the tissue segmentation ranges. Statistical uncertainties of <1.4% are not plotted for clarity.
