METHOD OF DETECTING EXPLOSIVE IN CONTROLLED OBJECT Russian patent published in 2016 - IPC G01N23/222 

FIELD: physics.

SUBSTANCE: invention relates to neutron radiation analysis of materials using their irradiation with thermal neutrons and may be used for detection of nitrogen-containing explosive substances in inspected objects without opening. Method involves irradiation with thermal neutrons of a chamber equipped with radiation protection and at least one gamma-radiation detector, determining energy spectrum of detected gamma-radiation of chamber in range of energy of gamma quanta of 5-11 MeV, counting number of background gamma-quanta with energy of 9.9 to 11.0 MeV, detected during irradiation of chamber, arrangement in chamber of a reference iron-containing material with known weight content of iron, irradiation thereof with thermal neutrons, determining energy spectrum of detected gamma-radiation of reference iron-containing material in range of energy of gamma quanta of 5-11 MeV, arrangement in chamber of a reference chromium containing material with known weight content of chromium, irradiation thereof with thermal neutrons, determining energy spectrum of detected gamma-radiation of reference chromium-containing material in range of energy of gamma quanta of 5-11 MeV, arrangement in chamber of inspected object, irradiation thereof with thermal neutrons, determining energy spectrum of detected gamma-radiation of chamber with inspected object in range of energy of gamma quanta 5-11 MeV, counting number of gamma-quanta with energy of 9.9-11.0 MeV detected during irradiation of inspected object located in chamber, determining expected number of background gamma-quanta through summation with number background adjustment gamma-quanta detected during irradiation chamber, obtained based on analysis of energy spectra of inspected object and reference iron-containing and chromium-containing materials, and making a decision on presence of an explosive in inspected object if number of gamma-quanta with energy of 9.9-11.0 MeV detected during irradiation of inspected object located in chamber is greater than expected number of background gamma-quanta.

EFFECT: reduced probability of false alarm in case of presence in inspected object of materials containing iron or chromium.

6 cl, 4 dwg