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Title: SU-E-I-78: Establishing a Protocol for Quick Estimation of Thyroid Internal Contamination with 131I in Normal and Emergency Situations

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 ╬╝Ci 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 staffmore » for daily checks in normal working conditions and also in accidents.« less
Authors:
 [1] ; ;  [2] ; ; ; ; ;  [3] ;  [4]
  1. Radiation Research Center, Shiraz university, Shiraz, Fars (Iran, Islamic Republic of)
  2. Radiation medicine department, school of mechanical engineering, Shiraz uni, Shiraz, Fars (Iran, Islamic Republic of)
  3. Shiraz University, Shiraz, Fars (Iran, Islamic Republic of)
  4. Shahid Beheshti University, Shiraz, Fars (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22494020
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 42; Journal Issue: 6; Other Information: (c) 2015 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPES AND RADIATION SOURCES; 60 APPLIED LIFE SCIENCES; CALIBRATION; DOSE RATES; IODINE 131; NECK; NUCLEAR MEDICINE; PHANTOMS; PMMA; RADIONUCLIDE KINETICS; SCINTILLATION COUNTERS; SKELETON; THYROID