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A basic study of some normoxic polymer gel dosimeters.

Y De Deene1, C Hurley, A Venning

  • 1Centre for Medical, Health and Environmental Physics, Queensland University of Technology, Australia. y.dedeene@qut.edu.au

Physics in Medicine and Biology
|November 1, 2002
PubMed
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Polymer gel dosimeters are challenging to manufacture due to oxygen inhibition. This study explores new normoxic gel formulations, identifying effective antioxidants like ascorbic acid and tetrakis(hydroxymethyl)phosphonium for improved radiosurgery applications.

Area of Science:

  • Medical Physics
  • Radiotherapy Dosimetry
  • Polymer Science

Background:

  • Polymer gel dosimeters are crucial for 3D dose verification in radiotherapy, particularly for intensity-modulated radiotherapy (IMRT).
  • Clinical adoption of polymer gel dosimeters has been limited due to manufacturing difficulties, primarily oxygen inhibition of polymerization.
  • Traditional methods to overcome oxygen inhibition involve nitrogen purging and glove boxes, complicating the manufacturing process.

Purpose of the Study:

  • To perform chemical analysis of the MAGIC gel dosimeter and evaluate its radiation response.
  • To investigate alternative normoxic gel formulations with simpler chemical compositions.
  • To identify effective antioxidants for oxygen scavenging in polymer gel dosimeters.

Main Methods:

Related Experiment Videos

  • Chemical analysis of the MAGIC gel (methacrylic acid, gelatin, ascorbic acid, hydroquinone, copper(II)sulphate).
  • Varied gel composition and evaluated radiation response.
  • Investigated the role of ascorbic acid, N-acetyl-cysteine, and tetrakis(hydroxymethyl)phosphonium as antioxidants.
  • Utilized potentiometric oxygen measurements to assess oxygen scavenging rates.
  • Analyzed the catalytic role of copper(II)sulphate in ascorbic acid oxidation.

    • Main Results:

    • Ascorbic acid effectively binds oxygen, functioning as an antioxidant in polymer gel dosimeters.
    • N-acetyl-cysteine and tetrakis(hydroxymethyl)phosphonium are effective oxygen scavengers, with tetrakis(hydroxymethyl)phosphonium showing the highest reactivity.
    • Copper(II)sulphate acts as a catalyst in the oxidation of ascorbic acid.
    • Oxygen scavenging rates are dependent on the antioxidant type and concentration.

    Conclusions:

    • Ascorbic acid is a viable antioxidant for normoxic polymer gel dosimeters.
    • Tetrakis(hydroxymethyl)phosphonium is a highly effective antioxidant for oxygen scavenging.
    • Copper(II)sulphate's catalytic role suggests opportunities for optimizing gel formulations.
    • Proposed new normoxic gel formulations with simplified chemical compositions offer a more practical alternative to the MAGIC gel for clinical use.