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UK laboratory intercomparison on internal dosimetry.

J Speed1, A Birchall, R Bull

  • 1AWE, Aldermaston, Berks, UK.

Radiation Protection Dosimetry
|October 21, 2003
PubMed
Summary
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UK laboratories achieved satisfactory agreement in internal dose assessments using updated ICRP models. However, variability was noted in complex intake scenarios involving multiple radionuclides and wound contamination.

Area of Science:

  • Medical Physics
  • Radiation Protection
  • Radiological Dosimetry

Background:

  • This study details the first UK intercomparison of internal dose assessments employing the International Commission on Radiological Protection's (ICRP) revised Human Respiratory Tract and biokinetic models.
  • Four participating UK laboratories assessed six distinct intake scenarios.

Observation:

  • Overall agreement in committed effective dose (e(50)) assessments was satisfactory, with 79% of results falling within +/- 40% of the median.
  • The smallest range in dose estimates (1.2) was observed for a Cesium-137 inhalation case.
  • The largest range (6.0) occurred in a complex wound and potential inhalation case involving Plutonium-238, Plutonium-239, and Americium-241.

Findings:

  • Variability in dose assessment was attributed to decisions regarding data selection for intake estimation.

Related Experiment Videos

  • Differences in parameter choices for the ICRP models contributed to inter-laboratory variation.
  • The impact of Diethylenetriaminepentaacetic acid (DTPA) treatment on dose assessment also introduced variability.

    • Implications:

    • While generally satisfactory, the intercomparison highlights areas for improvement in internal dose assessment consistency, particularly for complex exposure situations.
    • Standardization of data selection and model parameterization is crucial for enhancing the reliability of internal dose assessments.
    • Further research may be needed to refine methodologies for complex intakes involving mixed radionuclides and non-inhalation routes.