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Model testing using data on 131I released from Hanford.

K M Thiessen1, B A Napier, V Filistovic

  • 1SENES Oak Ridge Inc., Center for Risk Analysis, 102 Donner Drive, Oak Ridge, TN 37830, USA. kmt@senes.com

Journal of Environmental Radioactivity
|June 25, 2005
PubMed
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This study tested dose reconstruction models using a 1963 Iodine-131 (131I) release at Hanford. Model predictions varied, highlighting the need to address data, parameters, and site-specific adjustments for accurate environmental dose assessments.

Area of Science:

  • Environmental Science
  • Radiological Health
  • Nuclear Safety

Background:

  • An accidental release of Iodine-131 (131I) occurred at the Hanford Purex Chemical Separations Plant in 1963.
  • Monitoring data from this event were used to evaluate dose reconstruction models.

Purpose of the Study:

  • To test and compare models typically used in dose reconstructions.
  • To identify key factors contributing to uncertainty in dose assessment results.

Main Methods:

  • Utilized the Hanford 1963 131I release scenario and post-release monitoring data.
  • Applied various dose reconstruction models for comparison and validation.
  • Assessed primary exposure pathways, focusing on ingestion of contaminated milk and vegetables.

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Main Results:

  • Predicted mean thyroid doses for reference individuals ranged from 0.0001 to 0.8 mSv.
  • Predicted thyroid doses for children with high milk consumption ranged from 0.006 to 2 mSv.
  • Predicted deposition varied significantly among models (factor of 5-80).

Conclusions:

  • The exercise facilitated comparison of assessment methods and conceptual approaches.
  • Model predictions were tested against measurements, identifying key uncertainty contributors.
  • Factors influencing predictions include data handling, input interpretation, parameter selection, and site-specific adjustments.