Double-end window scintillation crystal nonmetal wide-temperature-resistant packaging structure

Abstract

The utility model discloses a double-end window scintillation crystal nonmetal wide-temperature-resistant packaging structure, the side surface of a scintillation crystal is wrapped with a light reflection layer material, two end surfaces are connected with light-transmitting glass through an optical coupling layer to serve as a light output end window, and the combined whole is sealed in a nonmetal housing through a wide-temperature sealant. And the two ends are further sealed and fixed through locking end covers. According to the utility model, the shell is made of a non-metal material, the thermal expansion coefficient of the shell is close to that of the scintillation crystal, and the problem that the double-end window crystal packaging structure is damaged in high and low temperature environments can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of scintillation crystal packaging technology, and in particular to a non-metallic wide-temperature resistant packaging structure for a dual-end window scintillation crystal. Background Technology

[0002] Scintillation crystals are materials that can absorb high-energy radiation such as gamma rays. They convert this energy into narrow-pulse flashes, which, in conjunction with photomultiplier tubes or photodiodes and data acquisition systems, are used to detect the energy and location information of radioactive materials.

[0003] In the field of nuclear logging for oil exploration, scintillation crystals typically operate at depths of several thousand meters underground, requiring them to withstand extreme temperature variations, ranging from extremely low to extremely high. To meet these application requirements, the current mature technology involves manufacturing the scintillation crystal as a cylinder, with reflective material and a metal shell encapsulated on the sides. One end of the scintillation crystal is encapsulated with transparent glass, connected to a photomultiplier tube, while the other end is wrapped with reflective material and then supplemented with springs or inert gases to compensate for the thermal expansion of the scintillation crystal at high temperatures.

[0004] With the emergence of detection methods that connect photomultiplier tubes to both ends of a scintillation crystal, traditional thermal expansion compensation methods can no longer be used. If the traditional process is used to directly encapsulate the two ends with transparent glass, the transparent glass will shatter due to the expansion of the scintillation crystal when the ambient temperature is greater than 70°C. This hinders the widespread application of the new detection method in high-temperature environments. Utility Model Content

[0005] To overcome the problem of breakage of the translucent glass of the double-ended window caused by thermal expansion of the scintillation crystal, this invention provides a wide-temperature-resistant double-ended window scintillation crystal packaging structure.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: the dual-end window scintillation crystal non-metallic wide-temperature resistant packaging structure includes a scintillation crystal, a light-reflecting layer, a non-metallic shell, an end-face optical coupling layer, an end-face transparent glass, a wide-temperature sealant, and a locking end cap. The side of the scintillation crystal is a light-reflecting layer, and the two end faces are connected to the transparent glass through the optical coupling layer, serving as light output end windows. The assembled whole is sealed into the shell with sealant, and both ends are further sealed and fixed by locking end caps.

[0007] The scintillation crystals include, but are not limited to, sodium iodide (NaI) crystals, cesium iodide (CsI) crystals, and BGO crystals.

[0008] The materials of the non-metallic shell include, but are not limited to, PEEK (polyether ether ketone) and PI (polyimide).

[0009] The materials of the light-transmitting glass include, but are not limited to, K9 glass, quartz glass, and sapphire glass.

[0010] The materials of the light-reflecting layer include, but are not limited to, polytetrafluoroethylene and aluminized polyimide film.

[0011] The material of the end-face optical coupling layer is transparent optical silicone.

[0012] The wide-temperature sealant can maintain its adhesion at high and low temperatures, effectively improving the hermeticity of the scintillation crystal package.

[0013] Compared with the prior art, the beneficial effects that this utility model can achieve are: the coefficient of thermal expansion of the non-metallic material is close to that of sodium iodide crystal and cesium iodide crystal, and the expansion size of the shell and the crystal is the same under high and low temperature environments, which can avoid the damage of the double-ended window crystal packaging structure under high and low temperature environments. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a structural diagram of the present utility model.

[0016] In the diagram: 1. Scintillation crystal; 2. Light-reflecting layer; 3. Non-metallic casing; 4. End-face optical coupling layer; 5. End-face transparent glass; 6. Wide-temperature sealing adhesive; 7. Locking end cap. Detailed Implementation

[0017] This utility model provides a non-metallic high-temperature resistant packaging structure for a dual-end window scintillation crystal, including a scintillation crystal 1, a light-reflecting layer 2, a non-metallic shell 3, an end-face optical coupling layer 4, an end-face transparent glass 5, a wide-temperature sealing adhesive 6, and a locking end cap 7.

[0018] The scintillation crystal 1 is processed to the required size, and its two end faces are polished. The sides of the scintillation crystal are tightly wrapped with reflective material to form a light-reflecting layer 2, with only the two end faces of the crystal exposed. Organic photoresist is evenly applied to the end faces of the scintillation crystal and the light-transmitting glass 5 to form an end face optical coupling layer 4, which serves as the light output window. The entire assembly of the above processes is placed in a non-metallic housing 3. Due to the compressibility of the light-reflecting layer, it fits tightly against the inner wall of the non-metallic housing 3. There is an annular cavity between the two ends of the non-metallic housing and the end face light-transmitting glass, and the cavity is filled with high-temperature sealant 6 to isolate the scintillation crystal from the outside air. The two ends of the non-metallic housing 3 are provided with external threads, and the inner wall of the locking end cover has internal threads of the same size. The non-metallic housing and the locking end cover are connected by threads, which further improves the sealing degree and temperature stability of the packaging structure.

[0019] As an optional implementation, the scintillation crystal includes, but is not limited to, sodium iodide (NaI) crystals, cesium iodide (CsI) crystals, and BGO crystals.

[0020] As an optional implementation, the material of the non-metallic shell includes, but is not limited to, PEEK (polyether ether ketone) and PI (polyimide).

Claims

1. A dual-end window scintillation crystal non-metallic wide-temperature resistant packaging structure, comprising a scintillation crystal, a light-reflecting layer, a non-metallic shell, an end-face optical coupling layer, an end-face light-transmitting glass, a wide-temperature sealant, and a locking end cap, characterized in that: The sides of the scintillation crystal are wrapped with a light-reflecting layer material, and the two end faces are connected to a light-transmitting glass through a light coupling layer to serve as light output windows. The assembled whole is sealed into a non-metallic shell with a wide-temperature sealant, and the two ends are further sealed and fixed with locking end caps.

2. The dual-window scintillation crystal non-metallic wide-temperature-resistant packaging structure according to claim 1, characterized in that: Non-metallic shell materials include, but are not limited to, PEEK (polyether ether ketone) and PI (polyimide).

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