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Intermediate dosimetric quantities.

A M Kellerer1, K Hahn, H H Rossi

  • 1Radiobiological Institute, University of Munich, Germany.

Radiation Research
|April 1, 1992
PubMed
Summary
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This study introduces reduced cema, a new quantity for measuring radiation energy transfer. It addresses limitations of existing measures like kerma and cema, offering a more adaptable approach for dosimetry in various scenarios.

Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Radiological Physics

Background:

  • Energy transfer from ionizing radiation (photons, neutrons) to matter primarily involves charged particle production.
  • Kerma measures initial energy imparted by uncharged particles, independent of local receptor properties.
  • Existing quantities struggle with electron interactions and secondary particle fluence.

Purpose of the Study:

  • To define and explore reduced cema (converted energy per unit mass) as an analogous quantity for charged-particle fields.
  • To address limitations in quantifying energy imparted by charged particles, particularly electrons.
  • To establish a versatile parameter for radiation dosimetry.

Main Methods:

  • Definition of cema (converted energy per unit mass) for charged-particle interactions.

Related Experiment Videos

  • Introduction of reduced cema by considering secondary electrons below a cutoff energy (delta) as locally absorbed.
  • Modification of restricted linear collision stopping power (L delta) for reduced cema calculation.

    • Main Results:

    • Reduced cema bridges the gap between kerma and absorbed dose, becoming sensitive to local variations as cutoff energy decreases.
    • Larger cutoff energies for reduced cema approximate mean absorbed dose in a sphere defined by electron range.
    • Reduced cema is a function of fluence at and above the cutoff energy, useful for 'free-in-air' dose potential.

    Conclusions:

    • Reduced cema offers a flexible and adaptable measure for radiation energy transfer, overcoming limitations of kerma and cema.
    • The proposed quantity and modified L delta definition are valuable for advanced dosimetry and radiation transport calculations.
    • Reduced cema provides a robust parameter for specifying the dose-generating potential of charged-particle fields.