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Related Concept Videos

Radiation: Applications01:17

Radiation: Applications

1.2K
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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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.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
450
Absorption of Radiation01:05

Absorption of Radiation

813
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
813
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...
15.8K
Mutations01:35

Mutations

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Overview
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Updated: Aug 31, 2025

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

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Reirradiation: A complex situation.

C Chargari1, A Escande2, P Dupuis3

  • 1Radiation Oncology, Gustave Roussy Cancer Campus, Villejuif, France.

Cancer Radiotherapie : Journal De La Societe Francaise De Radiotherapie Oncologique
|August 20, 2022
PubMed
Summary
This summary is machine-generated.

Reirradiation for recurrent tumors is difficult due to limited data and toxicity risks. Advances in radiotherapy offer potential for cure with reduced side effects, but more research is needed.

Keywords:
BrachytherapyCuriethérapieProton therapyProtonthérapieRadiation oncologyRadiotherapyRadiothérapieRadiothérapie oncologieReirradiationRéirradiationSelectionSélection

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Area of Science:

  • Radiation oncology
  • Medical physics
  • Clinical oncology

Background:

  • Reirradiation of previously irradiated areas presents significant challenges.
  • Limited high-quality data exists on physical, radiobiological, and clinical aspects.
  • Substantial risks of severe toxicity arise from cumulative radiation doses and uncertain tissue recovery.

Purpose of the Study:

  • To address the challenges in reirradiation of tumor recurrence or second cancers.
  • To highlight the need for better data and understanding of risks.
  • To explore the potential of advanced radiotherapy techniques.

Main Methods:

  • Review of existing physical, radiobiological, and clinical data.
  • Analysis of risks associated with cumulative radiation dose.
  • Evaluation of tissue recovery in previously irradiated areas.

Main Results:

  • Reirradiation is inherently challenging due to data scarcity and toxicity concerns.
  • Advanced radiotherapy techniques show promise in improving outcomes.
  • The therapeutic index in reirradiation remains uncertain and requires further investigation.

Conclusions:

  • Despite challenges, advances in radiotherapy techniques offer hope for managing recurrent tumors.
  • Further research is crucial to optimize reirradiation strategies and minimize toxicity.
  • A better appraisal of the therapeutic index is necessary for complex reirradiation scenarios.