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Pixel-Grouping G(E) Functions for Estimating Dose Rates from Unknown Source Distributions with a Position-Sensitive

Hojik Kim1, Junhyeok Kim1, Jisung Hwang1

  • 1Department of Nuclear and Quantun Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon 34341, Republic of Korea.

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Summary

Accurate radiation dose estimation for unknown sources is crucial for worker safety. This study introduces pixel-grouping G(E) functions for position-sensitive detectors, improving dose accuracy by over 1.5 times compared to conventional methods.

Keywords:
G(E) functionambient dose equivalentcadmium zinc telluride (CZT)position sensitive detector (PSD)spectrum-to-dose conversion coefficient

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Area of Science:

  • Radiation detection and dosimetry
  • Nuclear instrumentation
  • Radiation safety engineering

Background:

  • Accurate estimation of radiation doses from unknown sources is vital for protecting personnel.
  • Conventional G(E) functions often yield inaccurate dose estimations due to detector shape and directional response variations.
  • Position-sensitive detectors (PSDs) record radiation energy and position, offering potential for improved dosimetry.

Purpose of the Study:

  • To develop and validate a novel method for accurate radiation dose estimation irrespective of radioactive source location.
  • To enhance the reliability of dose measurements in environments with unknown radiation source distributions.
  • To overcome the limitations of conventional G(E) functions in dosimetry applications.

Main Methods:

  • Utilized pixel-grouping G(E) functions within a position-sensitive detector (PSD).
  • The PSD records both the energy and position of radiation interactions.
  • Compared the accuracy of the proposed pixel-grouping G(E) functions against the conventional G(E) function.

Main Results:

  • The proposed pixel-grouping G(E) functions improved dose estimation accuracy by more than 1.5 times compared to the conventional G(E) function for unknown source distributions.
  • The novel method demonstrated more uniform error distribution across all directions and energies.
  • Conventional G(E) functions exhibited substantially larger errors in specific directions or energy ranges.

Conclusions:

  • The pixel-grouping G(E) functions provide a highly accurate and reliable method for radiation dose estimation.
  • This approach mitigates errors associated with unknown source locations and varying energy spectra.
  • The developed technique enhances radiation safety protocols in environments with unpredictable radiation sources.