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A method based on Monte Carlo simulation for the determination of the G(E) function.

Wei Chen1, Tiancheng Feng2, Jun Liu2

  • 1Institute of Nuclear Science and Technology. SiChuan University, Chengdu 610051, China Northwest Institute of Nuclear Technology, Xi'an 710024, China chwei2601@163.com.

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This study presents a Monte Carlo method to determine the G(E) function for a NaI(Tl) detector, crucial for accurate exposure dose estimation. The new method shows good agreement with ionization chamber measurements.

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Area of Science:

  • Nuclear physics
  • Radiation detection and measurement

Background:

  • The G(E) function method is vital for spectrometric exposure dose estimation.
  • Accurate determination of the G(E) function is essential for reliable dose measurements.

Purpose of the Study:

  • To develop and validate a Monte Carlo-based method for determining the G(E) function of a 4″ × 4″ × 16″ NaI(Tl) detector.
  • To assess the accuracy of the derived G(E) function by comparing calculated dose rates with experimental measurements.

Main Methods:

  • Utilized the Monte Carlo N-particle Transport Code to simulate gamma-ray interactions and obtain energy spectra.
  • Calculated the G(E) function by correlating deposited energy in an air ball with full-energy peak counts.
  • Employed curve-fitting software (1st0pt) to determine the coefficients of the G(E) function.

Main Results:

  • Successfully determined the G(E) function for the specified NaI(Tl) detector using the Monte Carlo method.
  • Calculated dose rates using the derived G(E) function showed good agreement with ionization chamber measurements.
  • The maximum deviation between the calculated and experimental dose rates was found to be 6.31%.

Conclusions:

  • The Monte Carlo-based method provides an accurate approach for determining the G(E) function of NaI(Tl) detectors.
  • This method offers a reliable tool for precise exposure dose estimation in spectrometric applications.
  • The validated G(E) function enables accurate absorbed dose rate calculations in air.