en Medical Physics Medical Physics گزارش کوتاه Short Report <p><strong>Background:</strong> The purpose of this project was to derive the brachytherapy dosimetric functions described by American Association of Physicists in Medicine (AAPM) TG-43 U1 based on high dose rate ¹⁹²I sources. <strong>Materials and Methods:</strong> The method utilized included both simulation of the designed Polymethyl methacrylate (PMMA) phantom using the Monte Carlo of MCNP4C and benchmarking of the simulation with thermoluminescent (TL) dosimeters. <strong>Results:</strong> The obtained results for the radial dose function and anisotropy function showed nominal errors of less than 3% between TL measurements and the MCNP4C results. <strong>Conclusion:</strong> It may be concluded that due to small observed errors and the large uncertainty associated with the high dose gradients near the source point the simulation results can be used for dose estimation.</p> Brachytherapy, 192Ir flexisource, MCNP calculation, radiation dosimetry 265 270 http://ijrr.com/browse.php?a_code=A-10-1-515&slc_lang=en&sid=1 N. Babaei Bidmeshki 790031947532846009520 790031947532846009520 Yes Department of Energy Engineering, Sharif University of Technology, P.O. Box 1485893169, Tehran, Iran M. Sohrabpour 790031947532846009521 790031947532846009521 No Department of Energy Engineering, Sharif University of Technology, P.O. Box 1485893169, Tehran, Iran S.R. Mahdavi 790031947532846009522 790031947532846009522 No Department of Medical Physics, Faculty of Medicine, Tehran University of Medical Sciences P.O. Box 1449614525, Tehran, Iran