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Library generation for detection and identification of shielded radioisotopes

  • US 9,256,713 B2
  • Filed: 04/21/2008
  • Issued: 02/09/2016
  • Est. Priority Date: 08/30/2007
  • Status: Active Grant
First Claim
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1. A method for determining and indicating the presence of a radioisotope threat, the method comprising:

  • at a computer device, receiving spectral data associated with a region or space captured by a detector for detecting radioisotopes;

    adjusting the captured spectral data by quantum efficiency values of a quantum efficiency value matrix based on the detector;

    comparing the adjusted spectral data with library stored spectral data, the library stored spectral data being created by;

    grouping possible materials with which a radioisotope interacts into one of a plurality of material groups;

    subdividing each of the plurality of material groups into a plurality of subgroups based on atomic number and/or electron affinity of a material;

    generating first data for each of the subgroups of each of the plurality of material groups, wherein the first data comprises a plurality of values each represents an interaction between a selected representative material for a corresponding subgroup and radiation at one of a plurality of energy levels;

    generating second data representing spectral characteristics of each radioisotope of interest at the plurality of energy levels; and

    for each radioisotope of interest, computing spectrum data representing an interaction between the radioisotope of interest using the second data with the first data for each of the plurality of subgroups in each material group to create library stored spectral data to be stored in a library; and

    based on the comparison, generating either a signal indicating a threat or generating a signal indicating a non-threat.

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