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Author Naderi, S. Mehdizadeh ♦ Karimipourfard, M. ♦ Lotfalizadeh, F. ♦ Zamani, E. ♦ Molaeimanesh, Z. ♦ Sadeghi, M. ♦ Sina, S. ♦ Faghihi, R. ♦ Entezarmahdi, M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ISOTOPES AND RADIATION SOURCES ♦ APPLIED LIFE SCIENCES ♦ CALIBRATION ♦ DOSE RATES ♦ IODINE 131 ♦ NECK ♦ NUCLEAR MEDICINE ♦ PHANTOMS ♦ PMMA ♦ RADIONUCLIDE KINETICS ♦ SCINTILLATION COUNTERS ♦ SKELETON ♦ THYROID
Abstract Purpose: I-131 is one of the most frequent radionuclides used in nuclear medicine departments. The radiation workers, who manipulate the unsealed radio-toxic iodine, should be monitored for internal contamination. In this study a protocol was established for estimating I-131 activity absorbed in the thyroid glands of the nuclear medicine staff in normal working condition and also in accidents. Methods: I-131 with the activity of 10 μCi was injected inside the thyroid gland of a home-made anthropomorphic neck phantom. The phantom is made up of PMMA as soft tissue, and Aluminium as bone. The dose rate at different distances from the surface of the neck phantom was measured using a scintillator detector for duration of two months. Then, calibration factors were obtained, for converting the dose rate at each distance to the iodine activity inside the thyroid. Results: According to the results of this study, the calibration factors for converting the dose rates (nSv/h) at distances of 0cm, 1cm, 6cm, 11cm, and 16cm to the activity (kBq) inside the thyroid were found to be 0.03, 0.04, 0.14, 0.29, and 0.49 . Conclusion: This method can be effectively used for quick estimation of the I-131 concentration inside the thyroid of the staff for daily checks in normal working conditions and also in accidents.
ISSN 00942405
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-06-15
Publisher Place United States
Journal Medical Physics
Volume Number 42
Issue Number 6