en Radiation Biology Radiation Biology تحقيق بديع Original Research <p><strong>Background:</strong> Therapeutic radiopharmaceuticals are designed to deliver high doses of radiation to selected target organs with an aim of minimizing unwanted radiation to surrounding healthy tissue. Due to the potential of targeted radiotherapy to treat a wide range of malignant conditions, [153Sm]-samarium maltolate was developed for possible therapeutic applications. <strong>Materials and Methods:</strong> The organ radiation-absorbed doses have been evaluated for human based on animal data. After intravenous administration of ¹⁵³Sm-Mal to four groups of rats, they were sacrificed at exact time intervals and the percentage of injected dose per gram of each organ was calculated by direct counting from rat data. Then S values for ¹⁵³Sm by using specific absorbed fractions were calculated. By taking advantage of the formulation that Medical Internal Radiation Dose suggests, radiation-absorbed doses for all organs were calculated and extrapolated from rat to human. <strong>Results:</strong> From rat data, it is estimated that a 185-MBq injection of ¹⁵³Sm-Mal into a human might result in the highest absorbed dose in the lymphoma tissues (liver 176.3, lungs 68, spleen 66.8 and sternum 19 mGy), especially in liver respect to the other tissues. <strong>Conclusion:</strong> These results suggest 153Sm-Mal as an efficiently new therapeutic agent in order to overcome possible lymphatic malignancies.</p> Absorbed dose, biodistribution, MIRD, internal dosimetry, 153Sm-Mal 173 180 http://ijrr.com/browse.php?a_code=A-10-1-557&slc_lang=en&sid=1 H. Rezaeejam amir.hakimi@aut.ac.ir 790031947532846009770 790031947532846009770 No Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran A. Hakimi 790031947532846009771 790031947532846009771 Yes Department of Energy Engineering and Physics, Amir Kabir University of Technology, Tehran, Iran A.R. Jalilian 790031947532846009772 790031947532846009772 No Nuclear Science and Technology Research Institute, Tehran, Iran P. Abbasian 790031947532846009773 790031947532846009773 No Department of Energy Engineering and Physics, Amir Kabir University of Technology, Tehran, Iran S. Shirvani-Aran 790031947532846009774 790031947532846009774 No Nuclear Science and Technology Research Institute, Tehran, Iran M. Ghannadi-Maragheh 790031947532846009775 790031947532846009775 No Nuclear Science and Technology Research Institute, Tehran, Iran