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Spreads of DEF values as a function of X-ray tube voltage and dependence of DEF on the tube voltage and effective energy of spectra at different depths in a water phantom for 10 mg/mL of Cu (section (A)), ZrO2 (section (B)) Ag (section (C)), CeO2 (section (D)), Gd2O3 (section (E)), Tm2O3 (section (F)), HfO2 (section (G)), and Bi2O3 (section (H)).
