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Neutron filter material and preparation method thereof

A filter material and neutron technology, applied in the field of neutron filter material and its preparation, can solve problems such as difficulty in reaching instrument design indicators, poor moderation effect of thermal neutrons and fast neutrons, insufficient epithermal neutron fluence, etc. , to achieve the effect of outstanding product performance, outstanding filtration performance and reliable preparation method

Active Publication Date: 2016-07-06
BEIJING RADIATION APPL RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In BNCT treatment equipment, the materials used for epithermal neutron filtration are generally made of aluminum, alumina and other materials. While filtering epithermal neutrons, the moderation effect on thermal neutrons and fast neutrons is poor. Insufficient epithermal neutron fluence, making it difficult to reach the instrument design index

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1, preparation neutron filter material

[0051] Aluminum powder (50g), aluminum fluoride powder (100g) and lithium oxide powder (10g), all of which are 200 mesh and with a purity of more than 95%, were mixed for 4 hours with a ball mill, and the rotating speed of the ball mill was 120 rpm to obtain a uniformly mixed Epithermal neutron filter material. The mixed epithermal neutron filter material is pressed into a cylindrical blank with a diameter of 50 mm by the traditional pressing method at a molding pressure of 100 MPa and a molding temperature of 30 ° C, and then the blank is sintered in a vacuum furnace. The sintering temperature is 600°C, the heating rate is 3°C / min, and the sintering time is 150min. Put the sintered blank into the hot isostatic pressing equipment for further pressing, the pressure is 100MPa, the holding temperature is 500°C, the temperature is raised to 350°C at a rate of 5°C / min, and then the temperature is increased at a rate of 3°C...

Embodiment 2

[0055] Embodiment 2, different epithermal neutron filter materials prepare neutron filter material

[0056] The steps of the preparation method are the same as in Example 1, except that the selected epithermal neutron filter material is replaced by tungsten powder, aluminum powder, titanium powder, boron carbide, titanium oxide, lithium fluoride, aluminum fluoride, oxide At least one of gadolinium, gadolinium fluoride, boron nitride, boron oxide, zirconium boride, titanium boride and lithium oxide powder.

[0057] After measuring, the performance of the neutron filter material prepared in this embodiment is as follows:

[0058] When the epithermal neutron filter material is aluminum fluoride (100g), aluminum powder (50g), titanium powder (5g) and boron oxide (5g), the sample density is 2.87g / cm 3 , the tensile strength is 220MPa, the apparent hardness ≥ HBR75;

[0059]The sample is placed in the californium neutron source. After the shielding test, the proportion of epitherm...

Embodiment 3

[0064] Embodiment 3, different mechanical equipment prepare neutron filter material

[0065] The steps of the preparation method are the same as in Example 1, except that the equipment used in the mechanical mixing method is a V-shaped mixer, a cone mixer or a tumbler.

[0066] After measuring, the performance of the neutron filter material prepared in this embodiment is as follows:

[0067] When using a V-shaped mixer, the sample density is 2.55g / cm 3 , tensile strength is 210MPa, apparent hardness ≥ HBR42;

[0068] The sample is placed in the californium neutron source. After the shielding test, the proportion of epithermal neutrons in the neutron energy spectrum is ≥92%, and the epithermal neutron fluence rate / thermal neutron fluence rate is ≥150.

[0069] When using a conical mixer, the sample density is 2.51g / cm 3 , the tensile strength is 206MPa, the apparent hardness ≥ HBR44;

[0070] The sample is placed in the californium neutron source. After the shielding test, ...

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Abstract

The invention discloses a neutron filter material and a preparation method thereof. The preparation method comprises 1, orderly carrying out primary compacting molding, sintering and hot isostatic pressure molding on an epithermal neutron filter material, or 2, putting the epithermal neutron filter material into a jacket and carrying out hot isostatic pressure molding, wherein the epithermal neutron filter material comprises at least one of tungsten powder, aluminum powder, titanium powder, boron carbide, titanium oxide, lithium fluoride, aluminum fluoride, gadolinium oxide, gadolinium fluoride, boron nitride, boron oxide, zirconium boride, titanium boride and lithium oxide powder. The neutron filter material has the advantages that 1, the neutron filter material has outstanding filterability and provides a specific energy section and especially provides a neutron beam of an epithermal neutron energy section, 2, the preparation method is reliable, product performances are outstanding, and in boron neutron capture therapy device use, the epithermal neutron filtration satisfies apparatus design indexes, and 3, the large-scale thick neutron filter material can be prepared and machining can be realized.

Description

technical field [0001] The invention relates to a neutron filter material and a preparation method thereof, belonging to the field of preparation of nuclear radiation shielding materials. Background technique [0002] With the rapid development of nuclear technology, various radiation sources such as reactors, accelerators and isotopes are widely used in the fields of national defense, nuclear power, nuclear medicine, nuclear scientific research and nuclear detection, among which neutrons of a specific energy range emitted by radiation sources become Important means and tools for medical treatment, detection and scientific research. [0003] The neutrons emitted by various radiation sources belong to the continuous energy spectrum including slow neutrons (<0.4eV), thermal neutrons (0.5~10keV) and fast neutrons (>10keV). The probability of reaction is different, and its functions are also different. In the fields of medical treatment, detection and scientific research,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622B22F3/16
Inventor 张龙马慧玲孟宪芳郭广水孙超刘迪曾心苗王连才郑金美
Owner BEIJING RADIATION APPL RES CENT
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