Packaging method for cerium-doped halogenated lanthanum scintillation crystal

Abstract

The invention discloses a packaging method for a cerium-doped halogenated lanthanum scintillation crystal. The packaging method is characterized in that the scintillation crystal sequentially undergoes grinding (to remove a corrosion layer), polishing and surface roughness in a hypoxia dry environment; a reflecting surface of the crystal and a reflection material form a diffuse reflection surface, a light-emitting surface and a high-refraction-rate optical coupling glue form a light-emitting port, and the optimum state of the crystal light-emitting surface is of a sawtooth-shaped optical microstructure; a scintillation crystal packaging structure which is resistant to oscillation, temperature shock and damp is designed; and three layers of composite protecting structures comprising a rigid sleeve pipe, a foaming heat-insulating buffer layer and a casing are arranged. An optical coupling agent at the front end of the crystal and an elastic gasket at the rear end of the crystal are made of soft elastic materials. A gap is reserved between a rear cover and a rigid gasket, the heat-insulating effect is improved, and a double-way compound sealant is adopted to adhere the position of a joint of the casing.

Description

technical field [0001] The invention relates to the field of scintillation crystal packaging, in particular to a packaging method for a cerium-doped lanthanum halide scintillation crystal Background technique [0002] Scintillation crystals are crystals that emit fluorescent pulses (scintillation light) when high-energy rays (such as X-rays, gamma rays) or other radioactive particles pass through, due to the excitation of the rays or particles. Scintillation crystals are widely used in nuclear medicine, high-energy physics, safety inspection, industrial non-destructive testing, space physics and nuclear prospecting, and are an indispensable material for related high-tech industries. [0003] Many of the high-performance scintillation crystals developed in recent years are prone to deliquescence or cracking, and require precise packaging to meet the harsh external conditions of use, such as cerium-doped lanthanum bromide crystals and cerium bromide crystals. Among them, ceri...

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Problems solved by technology

[0005] In order to solve the problems of poor temperature shock resistance, low performance and easy deliquescence of cerium-doped lanthanum halide scintillation crystals, the present invention provides a packaging method for cerium-doped lanthanum halide scintillation crystals. Grinding (removing the corrosion layer), polishing, and surface roughening are carried out in sequence; the reflective surface of the crystal and the reflective material form a diffuse reflection surface, and the light-emitting surface and high-refractive-index optical coupling glue form a high-light port. The best state of the light-emitting surface of the crystal is sawtooth shape optical microstructure; design a shock-resistant, temperature-shock-resistant, and moisture-proof scintillation crystal packaging structure: three-layer composite protection structure (rigid sleeve + foam insulation buffer layer + shell); the optical coupling agent at the front of the crystal and the rear The elastic gasket at the end is a soft elastic material; there is a gap between the back cover and the rigid gasket to improve the heat insulation effect; double-channel composite sealant is used to bond the seam of the shell

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