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Dose enhancement ratio as a function of the diameter, in the concentric spherical 1 μm-thick water shell distant from the AuNP surface. (a) A single AuNP with a diameter of 50 nm irradiated with 50 kVp X-rays; (b) A single AuNP with a diameter of 50 nm irradiated with 100 kVp X-rays; (c) A single AuNP with a diameter of 100 nm irradiated with 50 kVp X-rays; (d) A single AuNP with a diameter of 100 nm irradiated with 100 kVp X-rays.
