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Effective atomic numbers of some tissue substitutes by different methods: A comparative study.

Vishwanath P Singh1, N M Badiger1

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Journal of Medical Physics
|March 7, 2014
PubMed
Summary

This study calculated effective atomic numbers for human tissue substitutes using four methods. Auto-Zeff, direct, and interpolation methods showed good agreement in intermediate energy ranges for radiation interactions.

Keywords:
Atomic numbersCompton scatteringRayleigh scatteringgammamixture ruletissue substitutes

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Materials Science

Background:

  • Accurate effective atomic number (Zeff) calculation is crucial for radiation dosimetry and understanding tissue substitute behavior.
  • Various materials are used as human organ tissue substitutes in radiation research, necessitating validated calculation methods for their Zeff.

Purpose of the Study:

  • To calculate and compare the effective atomic numbers (Zeff) of several human organ tissue substitutes.
  • To evaluate the accuracy and agreement of four different computational methods (Auto-Zeff, direct, interpolation, and power law) for Zeff determination across various energy regions.

Main Methods:

  • Calculated Zeff for polyethylene terephthalate, red articulation wax, paraffin, bolus, pitch, polyphenylene sulfide, polysulfone, polyvinylchloride, and modeling clay.
  • Employed Auto-Zeff, direct, interpolation, and power law methods for Zeff computation.
  • Analyzed Zeff values in different radiation interaction energy regions (photo-electric, Compton, pair-production).

Main Results:

  • Auto-Zeff, direct, and interpolation methods demonstrated good agreement for Zeff in the intermediate energy region (0.1 MeV < E < 5 MeV) where Compton interactions dominate.
  • Significant differences in Zeff were observed between direct and Auto-Zeff methods in the photo-electric and pair-production regions.
  • Power law method results closely matched the direct method in the photo-electric absorption region.
  • All tested methods are suitable for representing the tissue equivalence of the studied substitutes.

Conclusions:

  • The choice of method for Zeff calculation impacts results, particularly in specific energy ranges.
  • Auto-Zeff, direct, and interpolation methods are reliable for intermediate energy calculations.
  • The direct method is appropriate for Zeff determination in the photo-electric region.
  • Accurate Rayleigh scattering estimation is vital for precise gamma interaction parameter calculations, independent of the atomic environment.