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Status of development of gamma-ray detector response function code or GAMDRF.

Fusheng Li1, Xiaogang Han

  • 1Baker Hughes, 2001 Rankin Rd, Houston, TX 77073, USA. fusheng.li@bakerhughes.com

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
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Summary

Accurate detector response functions (DRFs) are crucial for oilwell spectral logging. A new Monte Carlo code, GAMDRF, was developed to precisely model gamma-ray interactions with detectors like sodium iodide (NaI) and bismuth germinate (BGO).

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Area of Science:

  • Nuclear geophysics
  • Radiation detection and measurement

Background:

  • Accurate detector response functions (DRFs) are essential for spectral logging tools in the oilwell industry, particularly for geochemical logging.
  • Existing methods rely on DRFs to convert incident photon spectra into measurable pulse-height spectra.

Purpose of the Study:

  • To develop a robust computational tool for generating accurate DRFs for common gamma-ray detectors.
  • To address the need for precise modeling in spectral logging applications.

Main Methods:

  • Development of a Monte Carlo-based code named GAMDRF.
  • Incorporation of complete photon physics for comprehensive simulation.
  • Application to detectors such as sodium iodide (NaI) and bismuth germinate (BGO).

Main Results:

  • The GAMDRF code provides an accurate representation of detector response functions.
  • The developed code meets the requirements for spectral logging tools.
  • Successful modeling of photon interactions within NaI and BGO detectors.

Conclusions:

  • The GAMDRF code offers a reliable solution for generating accurate DRFs in oilwell logging.
  • This advancement improves the precision of geochemical logging tools.
  • Monte Carlo simulations based on complete photon physics are effective for detector response modeling.