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Energy-based Hp(3) measurement using solid-state detector.

Nao Ichikawa1,2, Kosuke Matsubara3, Atsushi Fukuda4

  • 1Department of Radiological Technology, Faculty of Health Science, Kobe Tokiwa University, 2-6-2 Otani-cho, Nagata-ku, Kobe, Hyogo 653-0838, Japan.

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|May 25, 2023
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Summary
This summary is machine-generated.

This study introduces an energy-based method for measuring personal dose equivalent at 3 mm depth (Hp(3)) using solid-state detectors (SSDs). The technique enhances accuracy and allows estimation of measurement errors for dedicated Hp(3) dosemeters.

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Solid-State Detector Technology

Background:

  • Accurate measurement of personal dose equivalent at 3 mm depth (Hp(3)) is crucial for radiation protection.
  • Existing methods may exhibit energy dependence, impacting measurement reliability.
  • Solid-state detectors (SSDs) offer potential for improved Hp(3) dosimetry.

Purpose of the Study:

  • To develop and validate an energy-based method for Hp(3) measurement using SSDs.
  • To assess the accuracy and consistency of the proposed method across different phantom types.
  • To improve the energy dependence of Hp(3) measurements and estimate potential errors.

Main Methods:

  • Incident and entrance surface air kerma were measured using an ionization chamber.
  • Three SSDs were used to obtain readings, half-value layer, and beam quality correction factors.
  • Backscatter factors (BSF) and conversion factors (C3) were determined to calculate Hp(3).

Main Results:

  • The X-ray beam quality correction factor (kQ,Q0) was consistent across all SSDs.
  • Conversion factor (C3) and BSF increased with tube potential.
  • Hp(3)/Ka,i(SSD) calculations showed consistency within 2.1% (anthropomorphic phantom) and 2.6% (slab phantom).

Conclusions:

  • The developed energy-based method using SSDs provides accurate Hp(3) measurements.
  • This approach mitigates energy dependence issues in Hp(3) dosimetry.
  • The method enables estimation of measurement errors for dedicated Hp(3) dosemeters, enhancing radiation safety protocols.