METHOD FOR DETECTING EXPLOSIVE MATERIAL IN A CONTROLLABLE OBJECT

The invention relates to a material neutron-irradiation analysis and can be used, mainly for detecting nitrogen-containing explosive materials in a closed controlled object. The inventive method consists in exposing a chamber, which is provided with a radiation shielding and with at least one gamma-...

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Hauptverfasser: SOROKIN, ALEKSANDR GEORGIEVICH, BRUK, ILYA BORISOVICH
Format: Patent
Sprache:eng ; fre ; rus
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Zusammenfassung:The invention relates to a material neutron-irradiation analysis and can be used, mainly for detecting nitrogen-containing explosive materials in a closed controlled object. The inventive method consists in exposing a chamber, which is provided with a radiation shielding and with at least one gamma-ray detector, to a slow-neutron radiation, in recording said gamma radiation by converting gamma-quantums into electric pulses and comparing the amplitudes thereof with threshold values, in determining the gamma-radiation energy distribution within a gamma-quantum energy range including a 2.23 MeV value and within a energy range comprising the upper limit of energy of gamma-quantums emitted, during the interaction with slow neutrons, by atomic nucleus of a chemical element contained in materials of the chamber, radiation shielding or the gamma-ray detectors, in determining a peak point and a decrement point of the energy distribution within said energy ranges, in determining the amplitude of electric pulses converted from the gamma-quanta whose energies correspond to the energy of the peak and decrement points and in bringing the amplitudes of said electric pulses in conformity with calculated values. Said method also consists in placing a controllable object in the chamber, in exposing said object to a slow-neutron irradiation, in recording a gamma-radiation, determining the gamma-radiation energy distribution within a gamma-quantum energy range comprising a 2.23 MeV value, in determining the peak point of the energy range and the amplitude of the electric pulses converted from the gamma-quanta whose energies correspond to the energy of the peak point, in determining the upper and lower threshold values for selecting electric pulses whose amplitude is proportional to the gamma-quantum energy equal approximately to 10.8 MeV taking into account said amplitude, in selecting the electric pulses whose amplitude is proportional to the energy of gamma-quantums equal approximately to 10.8 MeV by comparing the amplitudes thereof with the upper and lower threshold values, in calculating the selected electric pulses and in taking decision with respect to the presence of the explosive material in the controllable object when the quantity thereof exceeds the threshold value. The inventive method reduces the probability of a false alarm and the through passage of the explosive material. L'invention appartient au domaine de l'analyse des matériaux par rayonnement de neutrons