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High-resolution dosimetry with stimulated phosphorescence.

B E Bjärngard, G T Chen, B J Maddox

    Medical Physics
    |January 1, 1976
    PubMed
    Summary
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    This study explores radiophosphorescence dosimetry using CaSO4:Mn phosphor for high-resolution dose measurements. The technique achieves 0.2 mm spatial resolution, suitable for medical applications.

    Area of Science:

    • Medical Physics
    • Radiological Dosimetry
    • Materials Science

    Background:

    • Thermally stimulated radiophosphorescence offers potential for precise radiation dose measurement.
    • Calcium sulfate doped with manganese (CaSO4:Mn) is a known phosphor material for dosimetry.
    • High-resolution dosimetry is crucial for targeted radiation therapies and accurate dose distribution analysis.

    Purpose of the Study:

    • To investigate the efficacy of CaSO4:Mn phosphor in thermally stimulated radiophosphorescence for high-resolution dosimetry.
    • To evaluate the spatial resolution and sensitivity of this dosimetry method.
    • To demonstrate the practical application of the technique in measuring dose distributions from medical radiation sources.

    Main Methods:

    • Utilized small grains of CaSO4:Mn phosphor embedded in Teflon tape as the dosimeter.

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  • Employed a scanning microscope coupled with a photomultiplier to measure emitted light after irradiation.
  • Tested the method by measuring dose distributions from a radium needle and a beta-emitting eye applicator.

    • Main Results:

    • CaSO4:Mn phosphor exhibited sufficient room-temperature phosphorescence for doses exceeding 3000 rads.
    • Achieved a spatial resolution of approximately 0.2 mm.
    • Successfully mapped dose distributions from clinical radiation sources.

    Conclusions:

    • Thermally stimulated radiophosphorescence with CaSO4:Mn phosphor is a viable method for high-resolution dosimetry.
    • The technique demonstrates practical applicability in assessing dose distributions from medical sources.
    • This method holds promise for improving accuracy in radiation therapy and diagnostics.