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Estimates of doses from global fallout.

André Bouville1, Steven L Simon, Charles W Miller

  • 1National Cancer Institute, Division of Cancer Epidemiology and Genetics, Radiation Epidemiology Branch, Bethesda, MD 20892, USA. bouvilla@epndce.nci.nih.gov

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This study estimates radiation doses from nuclear fallout in the U.S. Global fallout doses were 0.4 mSv external and 0.6 mSv internal, primarily from Cesium-137. Future doses may reach 2.5 mSv from Carbon-14.

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Area of Science:

  • Environmental Science
  • Radiation Dosimetry
  • Public Health

Background:

  • Global fallout from nuclear activities poses long-term radiation exposure risks.
  • Previous assessments by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) provide extensive data on global fallout.
  • Understanding U.S. population doses from both global and intermediate fallout is crucial for public health risk assessment.

Purpose of the Study:

  • To summarize external and internal radiation doses from global fallout.
  • To present preliminary dose estimates from intermediate fallout in the contiguous United States.
  • To analyze doses specifically for the U.S. population from different fallout sources.

Main Methods:

  • Data extraction from UNSCEAR reports for global fallout.
  • Preliminary dose estimations for U.S. population from intermediate fallout.
  • Separate calculations for Nevada Test Site and global fallout events.

Main Results:

  • Global average effective doses before 2000: 0.4 mSv (external) and 0.6 mSv (internal), mainly from 137Cs.
  • Projected effective doses beyond 2000: ~2.5 mSv from long-lived 14C.
  • U.S. average external doses: ~0.5 mGy (Nevada Test Site) and ~0.7 mGy (global).
  • U.S. average internal thyroid doses for 1951 children: ~30 mGy (Nevada) and ~2 mGy (global).

Conclusions:

  • Cesium-137 was the primary contributor to early global fallout doses.
  • Long-lived Carbon-14 will dominate future effective doses from global fallout.
  • Nevada Test Site fallout resulted in higher average thyroid doses for U.S. children compared to global fallout.