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Related Experiment Video

Updated: Mar 18, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
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Scan MDCs for GPS-Based Gamma Radiation Surveys.

Tyler Alecksen1, Randy Whicker

  • 1*Environmental Restoration Group, Inc. (ERG), 8809 Washington St. NE, Suite 150, Albuquerque, NM 87113.

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|June 30, 2016
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This study introduces a new method for estimating the minimum detectable concentration (MDC) of radioactive soil contaminants using GPS-guided gamma surveys. The approach utilizes Monte Carlo simulations to improve accuracy and provides a web tool for practical survey planning.

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Area of Science:

  • Environmental Science
  • Nuclear Engineering
  • Radiation Detection

Background:

  • The Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) provides a standard method for estimating the minimum detectable concentration (MDC) of radionuclides in soil using gamma radiation detectors.
  • Accurate MDC estimation is crucial for effective site characterization and remediation planning in radiological surveys.
  • Existing methods may not fully address the complexities of modern survey techniques, such as GPS-based scanning.

Purpose of the Study:

  • To develop and present an alternative method for estimating scan MDCs specifically for GPS-based gamma surveys.
  • To compare the results of the proposed method with those outlined in MARSSIM.
  • To create a comprehensive database and user interface for accessing calculated scan MDC values.

Main Methods:

  • Utilized the probabilistic Monte Carlo N-Particle Extended (MCNPX) Transport simulation code to model detector efficiencies.
  • Developed an extensive database of MCNPX-based detection efficiencies for various survey configurations.
  • Created a web-based user interface to provide access to calculated scan MDC values.

Main Results:

  • The study presents an alternate method for estimating scan MDCs for GPS-based gamma surveys.
  • Results derived from the MCNPX modeling are compared to established MARSSIM values.
  • A database and web interface were successfully developed to support survey planning.

Conclusions:

  • The developed MCNPX-based method offers a viable alternative for estimating scan MDCs in GPS-based gamma surveys.
  • The associated database and web interface provide valuable tools for survey designers and regulators.
  • This work enhances the capability for accurate radiological survey planning and execution.