SENNA — PORTABLE SENSOR FOR EXPLOSIVES DETECTION BASED ON NANOSECOND NEUTRON ANALYSIS
Prototype portable device for detection of concealed explosive and other hazardous substances has been created on the basis of a neutron generator with built in position-sensitive detector of α-particles. Secondary γ-rays produced in the investigated volume by incident fast neutrons are detected in narrow (few nanoseconds) time interval counted from the moment of detection of the alpha particle, that had accompanied emission of neutron from the generator (Nanosecond Neutron Analysis / Associated Particles Technique NNA/APT). Analysis of the spectra of γ-rays allows one to determine elemental composition of the substances located in the investigated volume. Use of a position-sensitive tagging α-particle detector allows one to determine the flight direction of each neutron, and thus to divide the investigated volume into “voxels” producing its 3D “elemental” image.
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