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Dose calculations in current brachytherapy treatment planning systems (TPS) are commonly based on TG‐43U1 formalism. These TPS are obtained by superposition principle of single‐source dosimetric parameters in liquid water, neglecting the effects of tissue heterogeneity. In this work, the sensitivity of the TG-43U1 based radial dose function (g(r)) of Miniature Electronic Brachytherapy X-ray Sources...