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Related Concept Videos

Biological Effects of Radiation02:59

Biological Effects of Radiation

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...
Nuclear Transmutation03:20

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Nuclear Power02:36

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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
Nuclear Fuels
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Radioactivity and Nuclear Equations03:18

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Isotopes and Radioisotopes01:28

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:

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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
12:22

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

Published on: November 9, 2015

Plutonium worker dosimetry.

Alan Birchall1, M Puncher, J Harrison

  • 1Health Protection Agency, CRCE, Chilton, Didcot, Oxon, OX11 0RQ, UK. alan.birchall@hpa.org.uk

Radiation and Environmental Biophysics
|February 5, 2010
PubMed
Summary
This summary is machine-generated.

Estimates of plutonium (Pu) exposure risk are sensitive to biokinetic models. New research suggests potential dose changes, particularly for inhaled (239)Pu, impacting airway and alveolar exposures.

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Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
09:18

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident

Published on: December 14, 2017

Area of Science:

  • Radiological Protection
  • Internal Dosimetry
  • Biokinetics

Background:

  • Epidemiological studies linking plutonium (Pu) exposure and health risks depend heavily on accurate dose estimations.
  • The International Commission on Radiological Protection (ICRP) is updating biokinetic models and dosimetry, likely introducing significant changes to current assumptions.

Purpose of the Study:

  • To investigate the impact of potential revisions to the ICRP's respiratory tract model on dose estimates for inhaled (239)Pu.
  • To assess uncertainties associated with these model changes.

Main Methods:

  • Investigated effects of modified slow-clearing fraction and extended retention times on absorbed dose.
  • Performed uncertainty analyses using lognormal distributions for dose per unit intake.
  • Considered experimental data on solubility of nitrate and oxide forms of Pu.

Main Results:

  • Possible changes to airway models could reduce absorbed dose.
  • Insoluble (239)Pu doses to the alveolar region might double due to longer retention.
  • Dose estimates for moderately soluble (239)Pu are influenced by binding to lung tissue.
  • Uncertainty analyses yielded lognormal distributions with geometric standard deviations of 2.3 (nitrates) and 2.6 (oxides).
  • Median doses were three times higher than current ICRP default values due to bound fractions (nitrates) and slower clearance (oxides).

Conclusions:

  • Revisions to respiratory tract models can significantly alter dose estimates for inhaled (239)Pu.
  • Key areas for future research include particle transport, long-term dissolution, plutonium binding, and modeling of blood absorption.