Dose per incident x-ray in standard brachytherapy treatment (Blue) compared with the AuNP aided Brachytherapy treatment (Magenta) for a) uniform 30mg/g AuNP concentration, b) when brachytherapy needles (and so 125I seeds) are centered in the region with high AuNP concentration (Center region), with cCenter=66mg/g, cGradient=33mg/g, cTail=10mg/g; c) when the 125I seeds are in the Tail of the AuNP concentration, with cCenter=64.6mg/g, cGradient=32.3mg/g, cTail=10mg/g. Dose ratios between the two treatments are given on the top of the columns.