METHOD AND SYSTEM FOR DETECTING AN EXPLOSIVE
First Claim
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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Abstract
A method and system for detecting at least one explosive in a vehicle using a neutron generator and a plurality of NaI detectors. Spectra read form the detectors is calibrated by 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. The spectra are gain shifted to a common calibration, summed for respective groups of NaI detectors, and nitrogen detection analysis performed on the summed spectra for each group.
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Citations
18 Claims
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1. A method of determining a presence of at least one explosive in a vehicle, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for determining a presence of at least one explosive in a vehicle, the system comprising:
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a neutron generator located and oriented to direct energy at a vehicle location; a plurality of NaI detectors adjacent the vehicle location, comprising a plurality of groups containing different combinations of the NaI detectors; and a control system configured to; read spectra from the plurality of NaI detectors; calibrate 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 the location of at least one peak of the doublet; gain shift the spectra to a common calibration; sum the spectra for respective groups of NaI detectors; and perform nitrogen detection analysis on the summed spectra for each group. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification