Patent ID: 8513618
Filing Date: 2013-08-20
Classification: G01T,G01V

Abstract:
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.