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Related Experiment Videos

Charge storage in electron-irradiated phantom materials.

A K Ho, B R Paliwal, F H Attix

    Medical Physics
    |January 1, 1986
    PubMed
    Summary

    Charge storage in plastic phantoms can cause dose errors. Solid water phantoms show minimal charge storage compared to polymethylmethacrylate (PMMA) and polystyrene, offering a more reliable alternative for dosimetry.

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    Area of Science:

    • Medical Physics
    • Radiation Dosimetry
    • Materials Science

    Background:

    • Electron-irradiated plastic phantoms can exhibit dose errors.
    • Charge storage in phantom materials is a known issue affecting accuracy.
    • Polymethylmethacrylate (PMMA) and polystyrene are commonly used calibration phantom materials.

    Purpose of the Study:

    • To investigate charge storage effects in various plastic phantom materials.
    • To compare the charge storage properties of "solid water" with PMMA and polystyrene.
    • To identify reliable phantom materials for electron beam dosimetry.

    Main Methods:

    • Electron irradiation of different plastic phantom materials.
    • Measurement of charge storage in irradiated samples.
    • Comparative analysis of charge accumulation in solid water, PMMA, and polystyrene.

    Main Results:

    • Significant charge storage was observed in PMMA and polystyrene.
    • Solid water demonstrated minimal charge storage.
    • The findings highlight potential dosimetry errors when using PMMA or polystyrene.

    Conclusions:

    • Users of PMMA and polystyrene phantoms should be aware of potential dosimetry errors due to charge storage.
    • Solid water is a recommended alternative phantom material due to its minimal charge storage.
    • Choosing appropriate phantom materials is crucial for accurate electron beam dosimetry.

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