Alpha detector and D-T neutron marking device

Abstract

The invention discloses an alpha detector and a D-T neutron marking device. The alpha detector comprises a housing, a base, a scintillator, a photomultiplier tube array, and a signal read-out circuit. According to the alpha detector and the D-T neutron marking device, accompanying alpha particles generated by D-T fusion reaction are detected by using a scintillator to generate a corresponding scintillation light signal; the scintillation light signal is converted into a corresponding electric signal by using the photomultiplier tube array formed by arranging M * N photomultiplier tubes in M rows and N columns; a time stamp signal end formed by coupling the fast signal output ends of the M * N photomultipliertubes is used for giving out a time stamp signal; M * N paths of electric signals output by the photomultiplier tube array are simplified by using the signal read-out circuit; and finally four paths of position signals are obtained, so that the time and position resolution precision of accompanying alpha particles generated by the D-T fusion reaction is improved.

Description

technical field [0001] The invention relates to the field of nuclear detection technology and neutron application technology, in particular to an alpha detector and a D-T neutron marking device. Background technique [0002] The D-T neutron source uses a low-energy deuterium ion beam (usually dozens to hundreds of keV) to bombard a tritium target (usually a tritium-titanium target), and generates fast neutrons with an energy of 14.1 MeV through D-T fusion reactions, and simultaneously emits a neutron in the opposite direction. α particles with an energy of 3.5 MeV, because of their high neutron energy and good monochromaticity, are suitable for non-destructive testing of internal structures of large-scale components, structural testing of nuclear material components, high-confidence measurement of nuclear data, concealment of explosives, and drugs And active detection of chemical warfare agents and other fields have a very wide range of applications. [0003] However, when ...

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Problems solved by technology

For example, the American Thermoelectric Corporation's API-120 neutron tube developed a set of D-T neutron labeling detectors using YAP scintillators combined with fiber optic panels, but the use of fiber optic panels results in low light transmission efficiency and limited neutron labeling efficiency The ING-27 neutron generator developed by the Russian All-Russian Institute of Automation (VNIIA) uses silicon semiconductor detectors as accompanying α detectors, and its disadvantage is that it is difficult for a single silicon detector to be very small (currently 3*3mm 2 ), and the time resolution is limited (about 2ns); in addition, under the support of the EU framework project EURITRACK, Italy INFN developed an 8*8 array of accompanying α detection units using 64 independent YAP:Ce scintillators, but the size of a single scintillator Larger (5.8*5.8mm 2 ), and a single scintillator is used to lead independently, that is, 64 output signals, and the back-end data acquisition pressure is relatively high

[0005] Therefore, under the background that there are certain problems in the existing foreign products, and the relevant research has not yet met the needs of actual use, the research and development of a new type of high-precision time- and position-resolving α detector is helpful for further developing D-T neutron application technology and improving The accuracy of the measurement results is of great significance

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