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The experimental determination of C lambda using an absorbed dose calorimeter

P C Williams

    Physics in Medicine and Biology
    |January 1, 1980
    PubMed
    Summary
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    Absorbed dose conversion factors (C lambda) were experimentally determined for a Baldwin-Farmer ionization chamber. Results support a rigorous definition but show slight dependence on chamber construction assumptions.

    Area of Science:

    • Medical Physics
    • Radiation Dosimetry

    Background:

    • Absorbed dose conversion factors (C lambda) were historically used for high-energy photon dosimetry.
    • A more rigorous theoretical definition has since been developed.

    Purpose of the Study:

    • To experimentally determine C lambda values for a Tufnol-walled Baldwin-Farmer ionization chamber.
    • To validate the more rigorous definition of C lambda using experimental data.

    Main Methods:

    • Measurements were performed using a calorimeter.
    • Experiments covered a range of photon energies from cobalt-60 to 12 MV.

    Main Results:

    • Experimental results support the more rigorous definition of C lambda.
    • A minor dependence of C lambda values on ionization chamber construction assumptions was observed.

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    Conclusions:

    • The study validates the refined theoretical basis for C lambda.
    • Precise determination of C lambda requires careful consideration of ionization chamber design.