RT Journal Article SR Electronic T1 Use of a Voxel Phantom as a Source and a Second Voxel Phantom as a Target to Calculate Effective Doses in Individuals Exposed to Patients Treated with 131I JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 53 OP 56 DO 10.2967/jnmt.108.058172 VO 37 IS 1 A1 Albérico B. de Carvalho, Jr. A1 John Hunt A1 Ademir X. Silva A1 Fermin Garcia YR 2009 UL http://tech.snmjournals.org/content/37/1/53.abstract AB In this study, the Visual Monte Carlo radiation transport code and the female voxel phantom FAX were used to calculate organ and effective doses delivered by target–source irradiation geometries associated with radioiodine therapy treatments. Methods: Specific situations were considered: when a patient was accompanied during hospitalization, when a patient was accompanied on return to his or her residence, and when a patient received daily care at home. Results: This simulation study showed that, in the 3 situations considered, the total effective dose to an individual in normal contact with the patient was less than 0.85 mSv for up to 11.1 GBq (300 mCi) of administered activity. Conclusion: The results of this study suggest that for these patients receiving radioiodine therapy, radiation protection procedures after hospital discharge are unnecessary.