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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Feasibility study on a novel tiny dosimeter using a barium titanate capacitor.

Yuma Kuga1, Ryo Ogawara2, Masayori Ishikawa3

  • 1Graduate School of Biomedical Science and Engineering, Hokkaido University, N-15 W-7 Kita-ku, Sapporo Hokkaido, 060-8638, Japan.

Journal of Radiation Research
|December 18, 2019
PubMed
Summary

Barium titanate capacitors show radiation-induced capacitance changes, making them suitable for radiation dosimetry. Online capacitance measurements can correct for aging effects, improving dose rate and fractionated irradiation measurements.

Keywords:
Barium Titanate capacitorarray dosimeterin-vivo dosimetertiny dosimeter

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Area of Science:

  • Materials Science
  • Radiation Physics
  • Medical Physics

Background:

  • Capacitance changes in barium titanate (BaTiO3) materials due to radiation exposure are a known phenomenon.
  • Commercially available barium titanate capacitors are small, inexpensive, and suitable for integration into multidimensional or in-vivo radiation detection systems.

Purpose of the Study:

  • To evaluate the efficacy of barium titanate capacitors as radiation dosimeters.
  • To assess the linearity, dose rate characteristics, and response to fractionated irradiation of these capacitors.

Main Methods:

  • Investigated the capacitance changes in barium titanate capacitors upon exposure to ionizing radiation.
  • Analyzed dose linearity, dose rate dependency, and response to fractionated irradiation.
  • Implemented an online capacitance measurement strategy to mitigate aging effects.

Main Results:

  • Barium titanate capacitors exhibited good dose linearity.
  • Capacitance changes due to aging impacted measurement accuracy.
  • Online capacitance measurement immediately before irradiation effectively corrected for aging effects.
  • The corrected measurements demonstrated improved dose rate characteristics and response to fractionated irradiation.

Conclusions:

  • Barium titanate capacitors are a promising material for radiation dosimetry applications.
  • Online capacitance monitoring is crucial for accurate dosimetry, especially in scenarios with varying dose rates or fractionated exposures.
  • The developed method enhances the reliability of barium titanate-based dosimeters for in-vivo and multidimensional radiation monitoring.