A scintillator performance testing device and its consistency correction method

Abstract

The invention discloses a scintillator performance testing device and a consistency correction method thereof. The device comprises an array detector, a temperature compensation system, a preamplifier system, a multichannel data acquisition board and a testing box for accommodating a to-be-tested scintillator, wherein the scintillator placing position in the testing box is corresponding to each light detection device in the array detector; the preamplifier system is used for carrying out amplification molding and differential output on each path of signals outputted by the array detector; the multichannel data acquisition board is used for carrying out analog-to-digital conversion on received multiple paths of differential analog signals, real-time peak searching is then carried out on each path of digital signals to complete integration of each path of digital signals; the integral data of each path of signals are finally transmitted to a computer data acquisition system; and an energy spectrum obtained by each light detection unit is subjected to temperature compensation correction, light output result correction and energy resolution correction according to a specific method. The device can independently test multiple scintillators with no mutual interference, and the measurement result precision is improved.

Description

technical field [0001] The invention belongs to the technical field of nuclear radiation detectors, and relates to a scintillator performance testing device and a consistency correction method thereof. Background technique [0002] Particles or radiation in the field of high-energy physics cannot be directly observed, and can only be indirectly detected by converting them into optical or electrical signals known to humans through interaction with matter. Nuclear radiation detectors are devices that use this principle to detect high-energy particles or nuclear radiation events. They have been widely used in nuclear physics experiments, nuclear safety, nuclear medicine, geological detection, and industrial flaw detection. As one of the most widely used nuclear radiation detectors, scintillator detectors generally consist of scintillators, photodetection devices and electronics; The device performs photoelectric conversion and signal amplification, and finally obtains radiatio...

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Problems solved by technology

However, the photodetection device involved in this patent will be affected by some environmental factors (such as temperature and voltage), which will cause the instability of the scintillator performance measurement results; The light is detected by multiple photodetection units, and then the signals of multiple photodetection units are summed to obtain the signal amplitude corresponding to the light output of this scintillator, and the signal with part of the all-energy peak is the gamma photon generated Kang After Puton scattering, it is formed by depositing energy in two or more different scintillators. Therefore, the energy spectrum corresponding to one scintillator is affected by the inconsistency of the gain of the photodetection unit and the health of different scintillators. Due to the influence of Puton scattering, the accuracy of the full-energy peak-to-peak position will be limited. In general, it is about ±5%, and it can only reach ±3% under the best conditions. In addition, due to the inconsistency of the gain of each optical detection unit As well as the influence of Compton scattering, the energy resolution of the full-energy peak of the measured scintillator energy spectrum is also inaccurate, and cannot truly reflect the energy resolution of this scintillator for a certain energy gamma ray, so the device disclosed in the patent CN102353976A does not Integrate the functional module of energy resolution test

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