Combined scintillation crystal, combined scintillation detector and radiation detection device

Abstract

The invention discloses a combined scintillation crystal, a combined scintillation detector and a radiation detection device. The combined scintillation crystal comprises a plurality of scintillation crystals A and a plurality of scintillation crystals B, wherein performance of the scintillation crystals A is not as same as performance of the scintillation crystals B, the plurality of the scintillation crystals B are arranged into a B scintillation crystal module, the plurality of the scintillation crystals A wrap the B scintillation crystal module from the outer side of a ray incident plane of the B scintillation crystal module, sensitivity of the scintillation crystals A is lower than sensitivity of the scintillation crystals B, and light output of the scintillation crystals A is higher than light output of the scintillation crystals B. The combined scintillation crystal uses parameter differences of the different scintillation crystals to solve the problem that the sensitivity and counting rate linearity are contradictory, deposits a large quantity of low energy rays in the scintillation crystals A high in photon efficiency and deposits high energy rays in the scintillation crystals B low in photon efficiency through difference selection of the sensitivity and the light output, prevents a large quantity of photons from being generated, and then prevents SiPM saturation caused by the large photon quantity, effectively solves the problem that a dynamic range is not large enough when SiPM is used cooperatively with the scintillation crystals, and furthermore effectively alleviates a contradiction between a wide counting rate range and a high sensitivity demand.

Description

technical field [0001] The invention relates to the field of radiation detection, in particular to a combined scintillation crystal structure, a combined scintillation detector structure based on SiPM with the combined scintillation crystal structure and radiation detection equipment with the combined scintillation detector structure. Background technique [0002] Scintillation detectors are radiation detectors composed of scintillation crystals and photoelectric devices, providing device support for nuclear physics research, radiation measurement, and nuclear medical imaging equipment research. The scintillation crystal first converts x / γ-rays into visible photons, and then the photoelectric device converts the visible photons into electrical pulse signals, and the back-end classifies and counts the electrical pulse signals by amplitude to obtain radiation information. The new photoelectric device Silicon Photomultiplier (SiPM) has the characteristics of small size, large g...

AI Technical Summary

Problems solved by technology

Based on this structure detector, nuclear measurement instruments such as X / γ radiation dosimeter can be realized, but the scintillation detector with a single scintillation crystal structure has a contradiction between the sensitivity and the linear range of the count rate

High-sensitivity detectors will generate high count rate electrical pulse signals under strong radiation fields. On the one hand, it will cause surface accumulation effect and cause information loss. On the other hand, it puts forward high requirements on the performance of the back-end signal processing module, which greatly increases the Difficulty and cost of use; SiPM has limited dynamic range due to avalanche recovery time and pixel number limitations, and it is difficult to have a linear response to a wide range of light intensities

[0004] Therefore, in view of the above-mentioned technical problems, it is necessary to provide a combined scintillation crystal structure of a novel structure, a combined scintillation detector structure based on SiPM with the combined scintillation crystal structure and a radiation detection device with the combined scintillation detector structure, to solve The problem of the contradiction between sensitivity and count rate linearity existing in the prior art

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