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Biological Effects of Radiation02:59

Biological Effects of Radiation

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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...
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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.
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Treatment of Early-Stage Alzheimer's Disease With CT Scans of the Brain: A Case Report.

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Regarding LNT: Scientifically Worthless and Increasingly Indefensible; Regarding LNT: NRC Wrongfully Rejects Petitions to End LNT Model Use.

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Updated: Mar 27, 2026

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

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Threshold for Radon-Induced Lung Cancer From Inhaled Plutonium Data.

Jerry M Cuttler1, Charles L Sanders2

  • 1Cuttler & Associates Inc, Vaughan, Ontario, Canada.

Dose-Response : a Publication of International Hormesis Society
|January 8, 2016
PubMed
Summary

Radon exposure limits in homes should be reconsidered. New estimates suggest the safe level (no observed adverse effects level) is much higher, potentially preserving health benefits associated with low radon levels.

Keywords:
LNTNOAELinhaled plutoniumlung cancerradiation hormesisradon

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Area of Science:

  • Environmental Health
  • Toxicology
  • Radiation Science

Background:

  • The linear no-threshold (LNT) theory is commonly used to assess cancer risks from low-dose radiation.
  • Cohen's data on lung cancer mortality from radon exposure do not extend to the no observed adverse effects level (NOAEL).
  • Current radon limits may be set too low, potentially negating health benefits.

Purpose of the Study:

  • To estimate the no observed adverse effects level (NOAEL) for radon-induced lung tumors.
  • To evaluate the adequacy of current radon action levels for residential settings.
  • To inform public health policy regarding safe radon exposure limits.

Main Methods:

  • Assessed data from a study on inhaled plutonium dioxide particulates in dogs, using dogs as models for human response.
  • Extrapolated findings to estimate the NOAEL for radon-induced lung tumors.
  • Analyzed Cohen's lung cancer mortality data in relation to the LNT theory.

Main Results:

  • The estimated NOAEL for radon-induced lung tumors is approximately 2100 Bq/m(3).
  • Cohen's data do not support the current low radon limits when considering the NOAEL.
  • A higher radon limit could potentially preserve health benefits.

Conclusions:

  • The US Environmental Protection Agency's current radon action level of 150 Bq/m(3) may be too conservative.
  • Residential radon limits should be reconsidered and potentially raised to at least 1000 Bq/m(3).
  • Setting radon limits closer to the NOAEL is crucial for balancing risk assessment and potential health benefits.