Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of quartz crucible for growing csi(tl) crystal

A quartz crucible and crystal technology, applied in the fields of homeland security, military, and nuclear testing, can solve the problems of explosion, quartz crucible cracking, crystal growth too fast, etc., and achieve the effects of low cost, high yield and simple process

Active Publication Date: 2020-11-10
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly two methods for producing CsI(Tl) crystals: one, the quartz crucible vacuum descent method, the processed raw materials are loaded into the quartz crucible, and the vacuum descent method is the processed raw materials loaded into the quartz crucible, and the vacuum is sealed. Or fill it with a protective atmosphere and seal it, and obtain crystals by the descending method. The main problem encountered in this method is the adhesion of the crystals to the crucible wall, which leads to cracking or bursting of the quartz crucible, and the design of the bottom shape and overall shape of the quartz crucible.
[0004] The main reason for the cracking or bursting of the quartz crucible caused by the adhesion of the crystal to the crucible wall is that the temperature gradient difference during the crystal growth process is too small, resulting in the crystal growing too fast, which causes the crystal to adhere to the crucible wall, and the crucible wall is thin and easy to break
[0005] There are two ways to deal with it now: the first way is to apply a protective layer on the inner wall of the crucible; Crystal temperature gradient, but this way the crucible is more likely to break

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of quartz crucible for growing csi(tl) crystal
  • A kind of quartz crucible for growing csi(tl) crystal
  • A kind of quartz crucible for growing csi(tl) crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] A single crystal of φ100×100 mm (diameter×length) is grown.

[0089] Add the CsI(Tl) particle premix with a purity of 99.99% into the crucible, the amount of Tl added is 400ppm per hectogram of cesium iodide, and a deoxidizer of 200 per hectogram of cesium iodide is added, and the Deoxidation treatment.

[0090] The wall thickness of the crucible is 1 cm.

[0091] The particle size of the platinum powder particles is 0.12.

[0092] When cooling down, add ammonium chloride octahydrate and barium hydroxide particles from the gap.

[0093] When heating or crystal growth, the bottom bearing platform is placed on the motor shaft rotating platform.

Embodiment 2

[0095] Add the CsI(Tl) particle premix with a purity of 99.99% into the crucible, the amount of Tl added is 400ppm per hectogram of cesium iodide, and a deoxidizer of 200 per hectogram of cesium iodide is added, and the Deoxidation treatment.

[0096] The wall thickness of the crucible is 2cm.

[0097] The particle size of the platinum powder particles is between 0.20mm.

[0098] The particle size of the platinum powder particles is 0.18mm, more preferably 0.16mm, most optimally 0.14mm. The diameter of the hollow spherical shell is 2 / 3-3 / 4 of the length of the long side of the egg-shaped or elliptical quartz crucible.

[0099] When cooling down, add ammonium chloride and barium hydroxide octahydrate particles from the gap.

[0100] When heating or crystal growth, the bottom bearing platform is placed on the motor shaft rotating platform.

Embodiment 3

[0102] A single crystal of φ100×100 mm (diameter×length) is grown.

[0103] Add the CsI(Tl) particle premix with a purity of 99.99% into the crucible, the amount of Tl added is 400ppm per hectogram of cesium iodide, and a deoxidizer of 300 per hectogram of cesium iodide is added, and the mixture is placed in a vacuum environment at 220°C Deoxidation treatment.

[0104] like figure 2 As shown, in the figure, 1 is the cone angle of the longitudinal section of the bottom of the quartz crucible, 2 is the bottom wall of the crucible, 3 is the main body of the quartz crucible, and 4 is the mouth of the quartz crucible.

[0105] A single crystal of φ100×100 mm (diameter×length) is grown.

[0106] It is 120 ° to use the cone angle of the longitudinal section at the bottom of the quartz crucible, and the quartz crucible main body 3 connected with the bottom of the quartz crucible has an inclination angle, wherein the outer wall diameter L2 of the bottom end of the quartz crucible ma...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a quartz crucible for growing CsI(T1) crystals, which belongs to the field of nuclear detection, homeland security and military. According to a natural elimination principle ina crystal growth method, the bottom shape and integral overall appearance of the quartz crucible for growing the crystals are integrally designed, and a large-sized quartz crucible having special requirements for an external size and internal size can be obtained. Compared with the traditional method, the produced large-sized CsI(T1) / CsI flash crystal is high in finished product rate / yield; and compared with the traditional method for spraying a layer of special material into the crucible in other manufacturers, the method is simple in process, and relatively low in cost.

Description

technical field [0001] The invention belongs to the fields of nuclear detection, homeland security, military affairs and the like, and in particular relates to a quartz crucible for growing CsI(Tl) crystals. Background technique [0002] High-quality scintillation crystals are widely used in nuclear radiation measurements in nuclear physics experiments, medical imaging, security inspections and other fields. In special fields, such as high-energy physics experiments that need to detect high-energy rays, a larger volume of high-quality scintillation crystals is required, such as a size of 40×40×300mm 3 CsI(Tl) / CsI scintillation crystals. Due to the increasing demand for high-quality large-size crystals, and the traditional crystal batch growth method, the yield / yield rate is not high, and the result is that the price of scintillation crystals is relatively expensive. [0003] The Structural Unit of CsI(Tl) / CsI Scintillation Crystal is Cs-I 8 Cubic, belonging to the cubic c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C30B11/00C30B29/12
CPCC30B11/002C30B29/12
Inventor 陈若富石国柱沈爱花
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI