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ASSESSING BODY DOSE RATE CONSTANT AND EFFECTIVE BODY ABSORPTION FACTOR IN TAIWANESE REFERENCE PHANTOMS.

Shih-Yen Hung1,2, Dmytro Luzhbin3, Shu-Jun Chang4

  • 1Department of Radiology, Chi Mei Medical Center, Liouying, Tainan 73657, Taiwan.

Radiation Protection Dosimetry
|May 6, 2023
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Summary

This study introduces Taiwanese reference man (TRM) and woman (TRW) models to calculate radiation shielding needs in nuclear medicine. The models provide crucial data on body dose rate constants and effective absorption factors for common radiopharmaceuticals.

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Area of Science:

  • Medical Physics
  • Nuclear Medicine
  • Radiation Dosimetry

Background:

  • Patient body self-attenuation is critical for radiation shielding design in nuclear medicine.
  • Accurate dosimetry requires anthropomorphic models that reflect specific populations.

Purpose of the Study:

  • To construct Taiwanese reference man (TRM) and Taiwanese reference woman (TRW) phantoms.
  • To simulate and determine the body dose rate constant and effective body absorption factor for 18F-FDG, 131I-NaI, and 99mTc-MIBI using these phantoms.

Main Methods:

  • Development of TRM and TRW anthropomorphic phantoms.
  • Application of the Monte Carlo technique for radiation transport simulation.
  • Calculation of body dose rate constants and effective body absorption factors for specific radiotracers.

Main Results:

  • Maximum body dose rate constants for TRM and TRW were determined for 18F-FDG, 131I-NaI, and 99mTc-MIBI at various heights.
  • Effective body absorption factors ranged from 32.6% to 46.2% for TRM and 34.2% to 48.6% for TRW.
  • Results varied based on the radiopharmaceutical and phantom height.

Conclusions:

  • The derived body dose rate constants and effective body absorption factors are essential for accurate radiation shielding calculations.
  • TRM and TRW phantoms provide a valuable tool for nuclear medicine dosimetry and radiation protection.
  • These regional reference phantoms should inform regulatory secondary standards in nuclear medicine practices.