Homogeneous 'scintillator-semiconductor-scintillator' composite X-ray detector

Abstract

The invention provides a homogeneous 'scintillator-semiconductor-scintillator' composite X-ray detector including a front scintillator, a semiconductor photoconductive detector, and a rear scintillator that are in a sandwich structure and are combined through the interatomic attractive force without the need of a couplant. The front scintillator, and the rear scintillator are same in chemical composition and different in thickness, and are obtained by doping the matrix; and the semiconductor photoconductive detector comprises a semiconductor matrix, an electrode and a lead. The composite X-ray detector can be obtained by a universal thin film growth technique, in the growth process, only the doping concentration needs to be adjusted, the scintillator, the couplant, the photodiode or photomultiplier are simplified into one material, so that the composite X-ray detector has the advantages of simple production method, single production principle, short production cycle, and low production cost. Meanwhile, the couplant is not needed, the scintillators and the photoconductive detector are tightly combined through the interatomic attractive force, the light loss is small, and the detection efficiency is high.

Description

technical field

[0001] The invention belongs to the field of sensors, in particular to a "scintillator-semiconductor-scintillator" composite X-ray detector with the same matrix. Background technique

[0002] At present, X-ray detection technology has been widely used in safety inspection, medical health, non-destructive testing and other fields, and its core component is the detector. Currently used X-ray detection is divided into direct type and indirect type. The direct type is made of the principle of photoelectrons generated by semiconductor materials under X-ray irradiation. The detection efficiency is low and it is only suitable for low-energy X-rays; the indirect type uses scintillators to convert X-rays. For visible light, semiconductor photodiodes or photomultiplier tubes are used to detect visible light. The two are coupled together through coupling agents such as optical glue or silicone oil. With different scintillators, they are suitable for X-rays in different ...

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