Patent ID: 8084748

Claim:
A device for detecting and identifying a radioactive material, comprising: a first detector including a detection surface and configured to generate first pulse signals when gamma rays are incident onto said detection surface; a second detector configured to generate second pulse signals and provided in the front of the detection surface of the first detector, so that the gamma rays entering the second detector directly enter the first detector after passing through the second detector; and an identification unit comprising: a coincidence device configured to receive the first pulse signals and the second pulse signals from said first detector and said second detector; a multi-channel analyzer configured to receive the second pulse signals from the said second detector, the multi-channel analyzer generating the energy spectrum of gamma rays according to the second pulses, when one of said first pulse signals and said second pulse signals is valid; a linear gate configured to receive coincidence signals from said coincidence device, the linear gate being turned on, when the output signals of said coincidence device are valid, to allow said multi-channel analyzer to count said second pulses; and a determination device configured to determine the type of the radioactive material emitting the gamma rays according the generated energy spectrum of the gamma rays.