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Stem corrections for ionization chambers.

G S Ibbott, J E Barnes, G R Hall

    Medical Physics
    |November 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

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    This study quantifies the stem effect in ionization chambers. Researchers determined stem corrections for various ionization chamber systems within 1% accuracy using TLD measurements for precise exposure determination.

    Area of Science:

    • Medical Physics
    • Radiation Dosimetry

    Background:

    • Ionization chambers can exhibit a stem effect, where radiation interactions in the stem or cable influence exposure measurements.
    • This effect can lead to inaccuracies in apparent measured exposure, necessitating correction.

    Purpose of the Study:

    • To quantify the stem effect in several common ionization chamber systems.
    • To determine accurate stem corrections for these systems.

    Main Methods:

    • Exposure measurements were performed using thermoluminescence dosimeter (TLD) capsules at the center of 60Co fields of varying sizes.
    • Measurements were repeated using multiple ionization chamber systems, including Victoreen R meters, Capintec 192, PTW transit dose probe, and EG and G IC-18 probe.

    Main Results:

    Related Experiment Videos

    • Stem corrections for the evaluated ionization chamber systems were determined with an accuracy of within 1%.
    • Comparison of TLD and ionization chamber measurements revealed variations in exposure rate with field size, enabling stem effect calculation.

    Conclusions:

    • Accurate stem corrections are crucial for reliable ionization chamber measurements.
    • The methodology employed allows for precise determination of stem corrections for various dosimetry systems.