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Related Experiment Videos

Ionization yields in hydrocarbons under electron irradiation.

C J Tung1, J W Baum

  • 1Safety and Environmental Protection Division, Brookhaven National Laboratory, Upton, New York 11973.

Radiation Research
|September 1, 1989
PubMed
Summary

This study calculated ionization yields and W-values for hydrocarbon gases under electron irradiation. The results align well with established International Commission on Radiation Units and Measurements recommendations.

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Accurate determination of ionization yields and W-values is crucial for radiation dosimetry and understanding radiation-matter interactions.
  • Hydrocarbon gases are widely used in various applications, necessitating precise data on their response to electron irradiation.

Purpose of the Study:

  • To calculate ionization yields and W-values for hydrocarbon gases under electron irradiation.
  • To evaluate collision stopping powers and energy transfers for ionizing collisions.

Main Methods:

  • Inokuti's solution of the Fowler equation was employed, incorporating a linear dependence of ionization yield on source electron energy.
  • The Bethe formula was used to evaluate collision stopping powers, with mean excitation energies determined via an additivity rule modified by molecular bond strengths.

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  • Contributions from discrete level excitations and average energy transfers for subionization electrons were estimated using atomic calculations and differential ionization cross sections.

    • Main Results:

    • Calculated W-values for hydrocarbon gases showed good agreement with recommended values from the International Commission on Radiation Units and Measurements (ICRU).
    • The study provides a comprehensive theoretical framework for predicting ionization characteristics in hydrocarbons.

    Conclusions:

    • The theoretical approach effectively predicts W-values for hydrocarbon gases, validating the employed methods.
    • The findings contribute to a better understanding of electron interactions with hydrocarbon media and support accurate radiation dosimetry.