STRUCTURE ANALYSIS OF MATERIALS BY tagged neutrons

摘要

The solution relates to the analysis of materials by radiation methods, by measuring the secondary emission when irradiated with fast neutrons and can be used for the detection and identification of organic substances, including explosives. The apparatus comprises a deuterium-tritium neutron generator with a built-in multi-pixel alpha detector, arranged between the neutron generator and gamma detectors object of study, the gamma detectors based on the inorganic scintillator hardware data collection, provided triggering gamma detector and alpha-detector at a predetermined time recording window signal amplitude value to the gamma detector, time of occurrence of the signal with a gamma detector relative to the signal from the alpha detector number triggered gamma detector and, the number of the triggered pixel alpha detector, wherein the inorganic scintillators gamma detectors contain oxygen, gamma detectors are installed so that each of the gamma detectors fall labeled neutrons, and alpha-detector so located as to alpha particles accompanying neutrons which fall on a gamma detector, coming at least one pixel (pixel calibration) alpha-detector, a data acquisition apparatus is provided with means for measuring spectrum signals with gamma detectors provided coincidences signals in a gamma detector and signals recorded calibration pixel alpha detector in a predetermined time window, with the possibility of automatic calibration gamma detector energy scale simultaneously with the registration event by irradiating the test object labeled neutrons using the resultant signal spectrum with a gamma detector and the presence of a it peaks arising from inelastic scattering of fast neutrons by the oxygen nuclei contained in the gamma detectors, the distance S between the subject and the gamma de along the trajectory labeled neutron flux is not less than S = 3v · τ, where τ - temporal resolution in the measurement of alpha-gamma coincidence, v - speed of labeled neutrons. 1 bp f-ly, 5 fig., 1 tab.