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Polymer gel dosimeters with PVA-GA matrix.

Seyed Mohammad Mahdi Abtahi1, Hamid Sadeghi Abandansari2

  • 1Department of Physics, Imam Khomeini International University, Norouzian, P. O. Box 34149-16818, Qazvin, Iran. smabtahi2007@gmail.com.

Australasian Physical & Engineering Sciences in Medicine
|July 29, 2017
PubMed
Summary

A new polymer gel dosimeter, PVABAT, shows linear dose response and stability for radiation dosimetry. Its tissue-equivalent properties and improved resolution make it suitable for nuclear reaction applications.

Keywords:
MRIPVABATPolymer gel dosimeterPolyvinyl alcoholRadiation dosimetry

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Area of Science:

  • Materials Science
  • Medical Physics
  • Radiation Chemistry

Background:

  • Polymer gel dosimeters are crucial for accurate radiation dose measurement.
  • Existing dosimeters, like acrylamide-based gels, have limitations in resolution and stability.
  • Developing novel tissue-equivalent materials is essential for advanced dosimetry applications.

Purpose of the Study:

  • To investigate the properties of a new polymer gel dosimeter based on cross-linked polyvinyl alcohol, named PVABAT.
  • To evaluate the dose response, stability, and tissue-equivalent characteristics of the PVABAT gel.
  • To compare the performance of PVABAT with existing polymer gel dosimeters.

Main Methods:

  • Preparation of PVABAT polymer gel formulations.
  • Irradiation using a calibrated 60Co beam.
  • Quantification of dose response using MRI transverse relaxation rate (R2) measurements.

Main Results:

  • PVABAT exhibits a linear response to absorbed dose from 30 to 45 Gy.
  • The gel demonstrates good resolution with a maximal dose uncertainty of approximately 0.19 Gy.
  • The dosimeter's response remained stable for up to 192 hours post-irradiation.
  • Effective atomic number and electron density showed minimal differences (3.2% and 2%) compared to soft tissue.
  • The melting point of the new formulation significantly increased.

Conclusions:

  • PVABAT is a promising new polymer gel dosimeter with excellent linearity, stability, and resolution.
  • Its tissue-equivalent elemental composition makes it suitable for dosimetry in nuclear reaction applications.
  • PVABAT offers advantages over traditional acrylamide-based dosimeters for radiation therapy and nuclear science.