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Related Experiment Videos

A liquid ionisation chamber for neutron dosimetry

J C Chu, W H Grant, P R Almond

    Physics in Medicine and Biology
    |November 1, 1980
    PubMed
    Summary

    This study compares Jaffe and Onsager models for liquid ionization chambers in mixed fields. The Jaffe model shows higher efficiency, but liquid chambers struggle with precise neutron detection in high-gamma environments.

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    Area of Science:

    • Medical Physics
    • Radiation Detection
    • Dosimetry

    Background:

    • Liquid ionization chambers offer potential for radiation dosimetry.
    • Understanding ionization processes in liquids is crucial for accurate measurements.
    • Mixed neutron and gamma fields present dosimetry challenges.

    Purpose of the Study:

    • To evaluate theoretical models for liquid ionization chambers.
    • To compare experimental measurements with Jaffe and Onsager theories.
    • To assess the clinical applicability of liquid ionization chambers in mixed fields.

    Main Methods:

    • Studied theories of ionization in liquids.
    • Utilized Jaffe and Onsager theoretical models.
    • Performed experimental measurements using liquid ionization chambers.
    • Applied Bragg-Gray principle and Onsager's theory for sensitivity calculations.

    Main Results:

    • The Jaffe method predicted higher collecting efficiency than the Onsager model.
    • Calculations of gamma and neutron sensitivities showed significant uncertainties.
    • Uncertainties stem from ion distribution and W/e values in iso-octane.
    • Liquid ionization chambers are best suited for mixed fields with 10-20% gamma-neutron ratios.

    Conclusions:

    • The Jaffe model provides a better prediction of collecting efficiency.
    • Accurate dosimetry with liquid chambers is limited by current theoretical understanding and data.
    • Clinical use is challenging for detecting small neutron variations in fields with high gamma components.

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