×

ANOMALY DETECTION OF RADIOLOGICAL SIGNATURES

  • US 20120311933A1
  • Filed: 11/11/2010
  • Published: 12/13/2012
  • Est. Priority Date: 11/11/2009
  • Status: Active Grant
First Claim
Patent Images

1. A method for determining the presence or absence of anomalous radioactive materials in a target in a detection zone, said method comprising:

  • (i) obtaining a target gamma ray spectrum from the target;

    (ii) preparing, from the target gamma ray spectrum, a target data set comprising a plurality of intensity values, each intensity value being associated with an energy bin representing a gamma ray energy or range of gamma ray energies in the target gamma ray spectrum;

    (iii) pre-processing the target data set;

    (iv) performing Principal Component Analysis (PCA) on a correlation matrix of a pre-processed data library so as to generate principal components for a principal component space;

    (v) projecting the pre-processed target data set and the pre-processed data library into the principal component space;

    (vi) determining a distance between the projected pre-processed target data set and one or more clusters of the projected pre-processed data library in the principal component space; and

    (vii) comparing the distance with a predetermined threshold distance so as to determine if an anomalous radioactive material is present in the target,whereby either;

    if the distance is greater than or equal to the threshold distance, a signal is generated in response to the presence of the anomalous radioactive material in the target;

    orif the distance is less than the threshold distance, a signal is generated in response to the absence of the anomalous radioactive material in the target.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×