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The gastrointestinal absorption of the actinide elements.

J D Harrison1

  • 1National Radiological Protection Board, Didcot, Oxon, United Kingdom.

The Science of the Total Environment
|March 1, 1991
PubMed
Summary

Fractional absorption (f1) values for actinides significantly impact dose estimates. New human and animal data reveal factors influencing actinide absorption, crucial for accurate radiological protection.

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Area of Science:

  • Radiological sciences
  • Nuclear chemistry
  • Toxicology

Background:

  • Accurate dose estimation for ingested actinides relies heavily on fractional absorption (f1) values.
  • Uncertainty in f1 values for long-lived, alpha-emitting actinides poses a significant challenge in radiological assessments.
  • Recent advancements have expanded the available data on actinide absorption.

Purpose of the Study:

  • To review and synthesize current human and animal data on actinide fractional absorption from the gastrointestinal tract.
  • To evaluate the influence of various factors on actinide absorption, including chemical form, food incorporation, diet, and age.
  • To discuss the implications of new data for recommended f1 values by major radiological protection bodies.

Main Methods:

  • Comprehensive literature review of human and animal studies on actinide gastrointestinal absorption.
  • Analysis of factors affecting absorption: chemical form, dietary matrix, fasting status, and age at exposure.
  • Comparative analysis of existing f1 values from regulatory and advisory organizations.

Main Results:

  • Significant variability in actinide f1 values is observed, influenced by chemical speciation and food matrix.
  • Age at ingestion is a critical factor, with generally higher absorption in infants and children.
  • Dietary components and fasting status demonstrably alter fractional absorption rates.

Conclusions:

  • Existing f1 values require revision based on updated human and animal absorption data.
  • Standardized methodologies for assessing actinide absorption are needed for improved dose calculations.
  • Updated f1 values are essential for refining radiological protection standards for actinide exposure.

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