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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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Future development of biologically relevant dosimetry.

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Current methods for prescribing proton and ion beam therapy are insufficient. A multiscale approach is needed to develop new physical quantities for accurately quantifying biological outcomes in radiation therapy.

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Area of Science:

  • Medical Physics
  • Radiation Biology
  • Radiotherapy

Background:

  • Proton and ion beams are advanced radiotherapy techniques with unique biological effects.
  • Current treatment prescription methods, based on absorbed dose and a weighting factor, are inadequate for precise biological outcome quantification.
  • Understanding the complex biological response to radiation requires a more sophisticated approach than traditional microdosimetry or nanodosimetry.

Purpose of the Study:

  • To propose the development of new dosimetric quantities for radiotherapy.
  • To establish a foundation for a multiscale approach that bridges physical processes and biological effects.
  • To investigate the feasibility of a multiscale model for defining biologically weighted quantities in particle beam therapy.

Main Methods:

  • Reviewing current state-of-the-art techniques in microdosimetry, nanodosimetry, and track structure simulations.
  • Analyzing methods for quantifying reactive species and utilizing radiobiological and cross-section data.
  • Exploring multiscale models of biological response and their application to new dosimetric quantities.
  • Introducing the European metrology project 'Biologically Weighted Quantities in Radiotherapy'.

Main Results:

  • Current dosimetric approaches are insufficient for precise biological outcome prediction in particle therapy.
  • A multiscale framework is essential for linking physical energy deposition to biological effectiveness.
  • The European project aims to establish a multiscale model for new biologically weighted quantities.

Conclusions:

  • New dosimetric quantities are required for transparently separating physical and biological aspects of radiation therapy.
  • A multiscale approach, integrating various physical and biological data, is crucial for advancing particle beam therapy.
  • The development of these new quantities will enhance the accuracy and efficacy of proton and ion beam radiotherapy.