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Relationships of the DER and nanoparticle concentration varying with different pelvic sizes using the (a) 6 MV and (b) 10 MV photon beams. Gold nanoparticles with concentrations equal to 3, 7, 18, 30, and 40 mg/ml were used. The DER was calculated as the ratio of the target dose with nanoparticle addition to the target dose without nanoparticle addition under the same simulation configuration.
