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THYROID PHANTOM MEASUREMENTS IN JOINT EURADOS-LLNL INTERCOMPARISON EXERCISE.

David P Hickman1, Lori Collins1, Didier Franck2

  • 1Lawrence Livermore National Laboratory, 7000 East Ave., L-383, Livermore, CA 94550, USA.

Radiation Protection Dosimetry
|October 7, 2017
PubMed
Summary

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INITIAL EVALUATION OF INDIVIDUAL DOSES IN THE EARLY PHASE OF A NUCLEAR REACTOR ACCIDENT BASED ON IN-VIVO MONITORING DATA AND SIMULATED RADIOLOGICAL CONSEQUENCES.

Radiation protection dosimetry·2018

This study compared radioiodine measurements using neck and thyroid phantoms across 35 facilities. No significant differences were found between phantom types, but variations emerged between experienced and new participants in the Thyroid Intercomparison Program.

Area of Science:

  • Radiation Dosimetry
  • In Vivo Radiobioassay
  • Nuclear Medicine

Background:

  • The European Radiation Dosimetry Group (EURADOS) and Lawrence Livermore National Laboratory's Thyroid Intercomparison Program (TRIP) are key in standardizing radioiodine measurements.
  • In vivo radiobioassay facilities require accurate calibration and intercomparison to ensure reliable thyroid burden assessments.

Purpose of the Study:

  • To evaluate differences in radioiodine measurements using neck and thyroid phantoms specified by American National Standards Institute standards.
  • To compare measurement results from 35 international facilities participating in an intercomparison exercise.
  • To identify variations between laboratories with and without prior participation in the TRIP program.

Main Methods:

  • Conducted an intercomparison exercise involving 35 in vivo radiobioassay facilities from 18 countries.

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  • Utilized neck and thyroid phantoms (20 and 30 ml) specified in American National Standards Institute standards.
  • Compared radioiodine (125I and 131I) measurement results against traceable standard activity levels.

    • Main Results:

    • No statistically significant differences were observed in normalized activity measurements between the 20 ml and 30 ml thyroid phantom types.
    • Noted differences in measurement results between laboratories routinely participating in TRIP and those new to the program.
    • Identified the need for further EURADOS-LLNL collaboration to investigate the causes of observed laboratory differences.

    Conclusions:

    • The intercomparison exercise confirmed consistency in radioiodine measurements across different phantom types.
    • Experience with the Thyroid Intercomparison Program appears to influence measurement accuracy and consistency.
    • Further collaborative studies are recommended to understand and address discrepancies among participating laboratories.