Patent ID: 7994482

Claim:
A method for determining a direction associated with gamma and/or neutron radiation emissions from a radiation source at stand-off distances, the method comprising: receiving from a first detector in a detector set, a first radiation photon count associated with the first detector, wherein the first radiation photon count is associated with at least one radiation source located at a stand-off distance from the first detector; receiving from a second detector in the detector set, a second radiation photon count associated with the second detector, wherein the second radiation photon count is associated with the at least one radiation source which is located at a stand-off distance from the second detector; comparing the first radiation photon count to the second radiation photon count; identifying, based on the comparing, that one of the first detector and the second detector has detected a larger number of radiation photons than the other; and determining, based on the identifying, that the at least one radiation source is in a direction that is substantially identical to a direction in which the one of the first detector and the second detector that has detected the larger number of radiation photons is facing.