Patent ID: 7214942
Filing Date: 2007-05-08
Classification: G01N,G01V

Abstract:
1. An assembly for detecting gamma rays from a bulk material, the assembly defining a radiation region, the assembly comprising: a radiation source adjacent the radiation region configured to irradiate the bulk material in the radiation region; a first gamma ray detector positioned adjacent the radiation region and configured to detect gamma ray events including events from gamma rays secondarily emitted by the bulk material responsive to radiation from the radiation source; a second gamma ray detector positioned adjacent the first gamma ray detector and configured to detect gamma ray events including events from gamma rays secondarily emitted by the bulk material responsive to radiation from the radiation source; a gamma ray shielding material between the first and second gamma ray detectors; and a coincidence module configured to receive signals indicating gamma ray events from each of the first and second gamma ray detectors and to identify events that are detected in coincidence in the first and the second gamma ray detectors and to generate a two-dimensional plot based on the signals from the first and second gamma ray detectors.