PORTABLE DETECTOR OF HAZARDOUS CONCEALED SUBSTANCES Russian patent published in 2013 - IPC G01N23/222 

FIELD: physics.

SUBSTANCE: device has a source of monochromatic neutrons and accompanying monochromatic α-particles and an α-particle detector enclosed in a vacuum chamber, a γ-radiation detector and recording electronic circuitry. The device is in form of two portable units - an inspection unit and a control unit - connected to each other, wherein the inspection unit includes a source of labelled monochromatic neutrons and accompanying monochromatic α-particles, an α-particle detector, γ-radiation detectors and recording electronic circuitry; the γ-radiation detector is placed at an angle close to 45° from the direction of flux of the labelled monochromatic neutrons, perpendicular to the near plane of the unit, and is provided with protection from the flux of labelled monochromatic neutrons, wherein the device is provided with an additional external γ-radiation detector which is connected to the inspection unit; both γ-radiation detectors are based on BGO crystals; laser line generators are configured to indicate on the inspected object overall dimensions of the region exposed to flux of labelled monochromatic neutrons; spectrometer channels of both γ-radiation detectors are fitted with a thermal correction system consisting of thermal sensors mounted on BGO crystals in thermal contact with said crystals, an amplitude-digital converter and a single-board minicomputer, wherein the thermal sensors are connected by a communication line and a power line to the amplitude-digital converter, which is connected to the single-board minicomputer, which is connected to the power supply system of the device and the control unit.

EFFECT: high luminosity, sensitivity of the device, high energy resolution of the spectrometer channel for detecting gamma-radiation and fewer errors associated with thermal correction of gamma-spectra.

3 cl, 3 dwg