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Related Concept Videos

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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Radiation: Applications01:17

Radiation: Applications

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
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Absorption of Radiation01:05

Absorption of Radiation

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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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Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
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Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Momentum And Radiation Pressure01:20

Momentum And Radiation Pressure

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An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.
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Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation
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Modifying radiation damage.

Kwanghee Kim1, William H McBride

  • 1Department of Radiation Oncology, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, California 90095, USA.

Current Drug Targets
|June 30, 2010
PubMed
Summary
This summary is machine-generated.

Radiation damage triggers innate immune responses that complicate healing. Understanding these "nature's whispers" can lead to better interventions for normal tissue radiation damage, improving recovery and mitigating side effects.

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Area of Science:

  • Radiation biology
  • Immunology
  • Tissue repair

Background:

  • Radiation exposure leaves a detectable mark on biological tissues.
  • Canonical biological responses to radiation damage obscure the initial radiation footprint.
  • Innate immune systems recognize radiation-induced danger signals, initiating complex healing cascades.

Purpose of the Study:

  • To explore non-free radical scavenging mechanisms influencing radiation responses.
  • To conceptualize these mechanisms within the framework of radiation-induced lesions.
  • To identify potential targets for therapeutic intervention in radiation damage.

Main Methods:

  • Review and conceptual analysis of existing literature on radiation biology and immunology.
  • Discussion of innate immune recognition systems in response to radiation.
  • Examination of molecular and cellular responses during tissue healing post-radiation.

Main Results:

  • Radiation-induced damage initiates innate immune responses that can lead to oscillating molecular and cellular events.
  • These immune responses, while attempting to heal, can complicate the understanding of the initial radiation lesion.
  • Non-free radical scavenging mechanisms play a significant role in modifying radiation responses.

Conclusions:

  • Understanding the immune system's role in radiation damage is crucial for developing targeted interventions.
  • Interventions aimed at modulating these immune responses can improve healing and mitigate acute and late effects of radiation.
  • Further research into these mechanisms is needed to refine therapeutic strategies for normal tissue radiation damage.