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X-ray surface dose measurements using TLD extrapolation

T Kron1, A Elliot, T Wong

  • 1Illawarra Cancer Care Centre, Department of Radiotherapy, Wollongong, NSW, Australia.

Medical Physics
|May 1, 1993
PubMed
Summary
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Accurate surface dose measurements using LiF thermoluminescence dosimeters (TLD) in therapeutic X-ray beams are crucial for patient skin dose. This study determined surface dose relative to maximum dose, finding it increases with field size and is affected by beam modifiers.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Surface dose in radiotherapy is critical for patient skin dose assessment.
  • Accurate measurement of surface dose is essential for treatment planning and delivery.
  • Therapeutic X-ray beams require precise dosimetry for effective and safe patient care.

Purpose of the Study:

  • To measure surface dose in therapeutic X-ray beams using LiF thermoluminescence dosimeters (TLD).
  • To investigate the effect of field size and beam modifiers on surface dose.
  • To evaluate the applicability of TLD extrapolation for intracavity and exit dose determination.

Main Methods:

  • Measurements were performed using a 6-MV linear accelerator and a solid water phantom.
  • LiF TLD chips of varying thicknesses were used to extrapolate dose to an infinitesimally thin layer.

Related Experiment Videos

  • Surface dose was measured for field sizes from 1x1 cm² to 40x40 cm², with and without a Perspex block tray.

    • Main Results:

    • Surface dose relative to maximum dose increased with field size (e.g., 10.0% for 5x5 cm², 26.9% for 20x20 cm²).
    • A 6-mm Perspex block tray increased surface dose (e.g., to 10.7% for 5x5 cm², 34.2% for 20x20 cm²).
    • TLD extrapolation is suitable for intracavity and exit dose measurements due to the small TLD chip size.

    Conclusions:

    • The study provides accurate surface dose data for 6-MV X-ray beams, essential for radiotherapy.
    • The findings highlight the impact of field size and beam modifiers on patient skin dose.
    • The TLD extrapolation technique offers a valuable method for in vivo dosimetry, including dose build-up information.