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Method and system for detecting an explosive

  • US 7,847,265 B2
  • Filed: 07/22/2010
  • Issued: 12/07/2010
  • Est. Priority Date: 04/06/2005
  • Status: Expired due to Fees
First Claim
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1. A method of determining a presence of at least one explosive in a vehicle, the method comprising:

  • directing energy at a vehicle using a neutron generator;

    reading spectra from a plurality of NaI detectors arranged adjacent the vehicle in a plurality of groups comprising different combination of NaI detectors;

    calibrating the spectra, comprising;

    performing Gaussian peak fitting to define peak regions;

    locating a Na peak and an annihilation peak doublet;

    assigning a predetermined energy level to one peak in the doublet; and

    predicting a hydrogen peak location based on a location of at least one peak of the doublet;

    gain shifting the spectra to a common calibration;

    summing the spectra for respective groups of NaI detectors; and

    performing Nitrogen detection analysis on the summed spectra for each group.

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