Calcium fluoride crystal containing europium, preparation method and application

A technology of calcium fluoride and crystals, which is applied in the field of preparation of calcium fluoride crystals containing europium, and can solve the problem that pure calcium fluoride crystals do not have scintillation fluorescence properties, etc.

Active Publication Date: 2015-02-18
BEIJING SCITLION TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] In order to overcome the defects in the prior art, the present invention provides a calcium fluoride crystal containing europium, its preparation method and application, which solves the problem that the pure calcium fluoride crystal does not have the performance of scintillation crystal absorbing the energy of high-energy particles and emitting a certain wavelength of scintillation fluorescence The problem

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  • Calcium fluoride crystal containing europium, preparation method and application

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preparation example Construction

[0036] The present invention also provides a method for preparing calcium fluoride crystals containing europium, said method comprising the following steps:

[0037] Step 1. Take calcium fluoride and europium fluoride powders in any content range and mix them thoroughly to obtain a mixture. Put the mixture in a vacuum drying oven after standing for 24 hours, and dry it at 200°C for 12 hours. , to obtain crystal-making raw materials;

[0038] Step 2. Put the crystal-making raw material obtained in the step 1 into a graphite crucible, place the crucible in a crystal growth furnace, and vacuumize the crystal growth furnace to 1.0×10 -3 Pa, the temperature is raised until the raw material is melted, the crucible is lowered at a speed of 5 mm / h, and the crystallization raw material is cooled to room temperature after the crystal-making raw material passes through the gradient zone completely to obtain the crystallization raw material;

[0039] Step 3, taking out the crystallizatio...

Embodiment 1

[0056] A kind of europium-containing calcium fluoride crystal preparation method provided by the invention specifically follows the steps below, and the preparation method comprises:

[0057] Step 1, get 1 kilogram of europium fluoride content (mass percentage) 0.5 * 10 -3 Wt% calcium fluoride and europium fluoride powders were fully mixed for 24 hours, then placed in a vacuum drying oven, and dried at 200°C for 12 hours;

[0058] Step 2, the content of europium fluoride in the calcium fluoride crystal is 0.5g, and the others are calcium fluoride crystals;

[0059] Step 3. Use the crucible to descend prepared by method.

[0060] crucible drop method Include the following steps:

[0061] 1) Add 1 kg of polycrystalline raw material obtained in the above steps to 1 gram of lead fluoride and mix evenly into a graphite crucible, put the graphite crucible into a descending furnace, and the crystal growth direction is or ;

[0062] 2) Vacuumize to make the vacuum inside t...

Embodiment 2

[0071] The present invention also provides a method for preparing calcium fluoride crystals containing europium, the preparation method comprising:

[0072] Step 1, raw material pretreatment step: take 1 kilogram of calcium fluoride and europium fluoride powder, the content is (mass percentage) 5 × 10 -3 % by weight, fully mixed for 24 hours, put in a vacuum drying oven, and dried at 200°C for 12 hours, wherein the content of europium fluoride in calcium fluoride crystals is 5g, and the remaining 995 grams are calcium fluoride crystals;

[0073] Step 2. Put 1 kg of crystal-making raw material obtained in step 1 into a graphite crucible, place the graphite crucible in a crystal growth furnace, and vacuumize the interior of the crystal growth furnace to 2×10 -3 Pa, the temperature is raised to the melting of raw materials, and the graphite crucible is lowered at a speed of 5mm / h, and the crystallization raw materials are lowered to room temperature to obtain crystallizat...

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Abstract

The invention relates to the technical field of crystal growth, in particular to a calcium fluoride crystal containing europium, a preparation method and application. The calcium fluoride crystal containing europium, provided by the invention, can be irradiate with Co60; the light yield of the crystal is measured with an RCA8850 photomultiplier; the result shows that the calcium fluoride crystal containing europium, provided by the invention, has the excellent scintillating crystal property of emitting twinkling fluorescent light of a certain wave length after absorbing the energy of high-energy particles on the condition that the content of the crystal is low. Especially, the relative light output of the crystal is equal to that of an LYSO scintillating crystal. Besides, as the content is low, the calcium fluoride crystal containing europium is beneficial to growth of high optical mass crystals. The invention further provides the preparation method and the application of the calcium fluoride crystal containing europium.

Description

technical field [0001] The invention relates to the technical field of crystal growth, in particular to a europium-containing calcium fluoride crystal, a preparation method and an application. Background technique [0002] In the prior art, the scintillation crystal is a crystal that absorbs the energy of high-energy particles and then emits scintillation fluorescence of a certain wavelength. Through the photoelectric conversion system and auxiliary electronic equipment, the energy of high-energy particles can be finally determined. Scintillation crystals can be used for the detection of X-rays, gamma rays, neutrons and other high-energy particles. Calcium fluoride crystal is a multi-functional and multi-purpose crystal material. It has the advantages of stable mechanical properties, easy processing, no deliquescence, low raw material price, and easy growth of large-sized single crystals. It is currently one of the most widely used optical crystals. One, but pure calcium fl...

Claims

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Application Information

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IPC IPC(8): C30B29/12C30B11/00C30B15/00G01T1/202
CPCC30B11/00C30B15/00C30B29/12G01T1/202
Inventor 甄西合张钦辉徐超刘建强史达威王琦
Owner BEIJING SCITLION TECH
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