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| Dynamoelectric machines for multiples of three phases with unbalanced fractional-slot windings |
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| Apparatus for fastening an air gap winding |
| There are claimed: 1. Apparatus for fastening an air gap winding for electric machines having a ... |
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| Method of manufacturing a copper bar induction rotor |
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| Structure of PM step motor and its fabrication |
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Apparatus for the detection of substances and in particular explosives by neutron irradiation thereof
| Details |
Inventors: Grenier, Gerard; Coursant, Roger H.; Rambaut, Michel;
Assignee: Commissariat A L'Energie Atomique (Paris, FR); Sodern Societe d'Etudes et de Realisations Nucleaires (Limeil Brevannes Cedex, FR)
Primary Examiner: Behrend; Harvey E.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
According to the invention, the object (34) is brought to a first inspection station (I to IV) in which the object is irradiated by thermal neutrons, the capture gamma radiation then liable to be emitted by the object and characterizing a chemical element of the substance to be detected is detected, if the intensity of said radiation exceeds a predetermined threshold, the object is brought to a second inspection station (V,VI), in which the object is irradiated by fast neutrons and the prompt gamma radiation then liable to be emitted by the object and characterizing the chemical element is detected, the energy of the fast neutrons being at least equal to that of prompt gamma radiation, in order to confirm or disprove the information obtained in the first station. |
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DETAILED DESCRIPTION We claim: 1.
Apparatus for the detection of a substance liable to be contained in an object (34) comprising: a first inspection station (I to IV), first irradiation means (2, 10) for irradiating said object at said first station by thermal neutrons, first detection means (12, 14, 16, 18) for detecting at least one capture gamma radiation liable to be emitted by the object due to thermal neutron irradiation thereof, said capture gamma radiation characterizing a chemical element in the substance, a second inspection station (V, VI), second irradiation means (10 or 62, 64) for irradiating the object at said second station by fast neutrons, second detection means (24, 26) for detecting at least one prompt gamma radiation liable to be emitted by the object due to fast neutron irradiation thereof, said prompt gamma radiation characterizing the chemical element, and the energy of the fast neutrons being at least equal to that of the prompt gamma radiation characterizing the chemical element, displacement means (30), said displacement means having means for bringing the object to the first inspection station (I to IV), means for bringing the object from the first inspection station to the second inspection station (V, VI), means for bringing the object from the first inspection station to a first area, means for bringing the object from the second inspection station to a second area, and processing and control means (60) for comparing the intensity of said capture gamma radiation and the intensity of said prompt gamma radiation to a predetermined threshold and to another predetermined threshold respectively, and for controlling the displacement means, so as to displace the object from the first inspection station to one of the first area, if the intensity of said capture gamma radiation is lower than said predetermined threshold, and the second inspection station, if the intensity of said capture gamma radiation is equal to or greater than said predetermined threshold, and from the second inspection station to one of the first area, if the intensity of said prompt gamma radiation is lower than said other predetermined threshold, and the second area, if the intensity of said prompt gamma radiation is equal to or greater than said other predetermined threshold
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