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Lead equivalent thickness (Pbeq) of WPVC composites containing 0–100 pph of Bi2O3 and 20–40 pph of wood particles for X-rays generated from a tube with supplied voltages of (a) 60 kV, (b) 100 kV, and (c) 150 kV. Red dotted lines represent Pbeq values of similar commercial X-ray shielding products used for determination of recommended Bi2O3 contents.
