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Related Experiment Videos

Charge build-up effects in insulating phantom materials.

L O Mattsson, H Svensson

    Acta Radiologica. Oncology
    |January 1, 1984
    PubMed
    Summary

    Charge trapping in insulating phantom materials like polystyrene and PMMA can increase electron fluence within ionization chambers. This phenomenon can lead to significant dosimetry errors, suggesting avoidance of these materials in electron beam dosimetry.

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    Area of Science:

    • Medical Physics
    • Radiation Dosimetry
    • Materials Science

    Background:

    • Electron irradiation of insulating materials can lead to charge trapping.
    • Insulating phantom materials like polystyrene and polymethylmethacrylate (PMMA) are used in radiation dosimetry.
    • Trapped charges can potentially influence measurement accuracy.

    Purpose of the Study:

    • To investigate the impact of charge trapping in insulating phantom materials on ionization chamber dosimetry.
    • To determine how trapped electrons affect electron fluence within ionization chambers.
    • To identify parameters influencing this dosimetry effect.

    Main Methods:

    • Irradiation of polystyrene and PMMA phantoms with electrons.
    • Measurement of electron fluence within a cylindrical ionization chamber.
    • Analysis of the influence of electron energy, absorbed dose, material properties, and chamber construction.

    Main Results:

    • Electron fluence inside the ionization chamber increases with the number of trapped electrons in the phantom.
    • Parameters such as electron energy, accumulated dose, and material purity affect charge trapping.
    • Radiation-induced conductivity and ionization chamber design also play a role.

    Conclusions:

    • Charge trapping in insulating phantom materials can cause dosimetry errors exceeding several percent.
    • Insulating phantom materials should be avoided in electron beam dosimetry to ensure accurate measurements.

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