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Related Concept Videos

Mutations01:39

Mutations

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Types of Radioactivity03:23

Types of Radioactivity

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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...
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Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
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Background radiation: natural and man-made.

M C Thorne1

  • 1Mike Thorne and Associates Limited, Abbotsleigh, Kebroyd Mount, Ripponden, Halifax, West Yorkshire HX6 3JA, UK. MikeThorneLtd@aol.com

Journal of Radiological Protection : Official Journal of the Society for Radiological Protection
|May 6, 2003
PubMed
Summary

Natural background radiation averages 2.4 mSv annually, significantly exceeding fallout from nuclear weapons testing. This highlights the pervasive natural radioactive environment compared to anthropogenic impacts.

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Area of Science:

  • Environmental Science
  • Radiation Biology
  • Public Health

Background:

  • Natural background radiation comprises cosmic rays, cosmogenic radionuclides, primordial radionuclides (uranium, thorium, potassium-40), and radon isotopes.
  • Atmospheric nuclear weapons testing has introduced artificial radioactive fallout into the environment.

Purpose of the Study:

  • To provide an overview and comparison of dose rates from natural background radiation and nuclear weapons fallout.
  • To estimate worldwide average exposures from various natural background radiation components.

Main Methods:

  • Compilation and synthesis of existing data on dose rates from different radiation sources.
  • Calculation of effective dose rates from external and internal exposure pathways.
  • Comparison of natural background radiation levels with historical nuclear weapons fallout data.

Main Results:

  • Worldwide average effective dose rate from natural background radiation is approximately 2.4 mSv per year.
  • Major contributors to natural background dose include radon (1196 microSv/yr), primordial radionuclides (480 microSv/yr external, 165 microSv/yr internal 40K), and cosmic rays (380 microSv/yr).
  • Nuclear weapons fallout dose rates peaked around 113 microSv in 1963 and have decreased to approximately 5.5 microSv annually, representing a small fraction of natural background.

Conclusions:

  • Natural background radiation is the dominant source of radiation exposure for the global population.
  • Anthropogenic radioactive releases, such as from nuclear weapons fallout, are generally of limited significance compared to the natural radioactive environment.
  • Understanding natural radiation levels is crucial for contextualizing the impact of artificial radiation sources.