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Radioactive anomaly discrimination from spectral ratios

  • US 8,513,618 B2
  • Filed: 12/28/2011
  • Issued: 08/20/2013
  • Est. Priority Date: 12/28/2010
  • Status: Expired due to Fees
First Claim
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1. A method for discriminating a radioactive anomaly from naturally occurring radioactive materials, the method comprising:

  • detecting a first number of gamma photons having energies for each of a first plurality of gamma energy lines within a predetermined period of time;

    detecting a second number of gamma photons having energies for each of a second plurality of gamma energy lines within the predetermined period of time;

    summing together the first numbers of gamma photons from each of the plurality of first gamma energy lines to obtain a first gamma photon total;

    summing together the second numbers of gamma photons from each of the plurality of second gamma energy lines to obtain a second gamma photon total;

    determining, in a controller, a ratio of the first gamma photon total and the second gamma photon total; and

    determining that a radioactive anomaly is present when the ratio exceeds a threshold value.

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