CN108467034B - Graphite crystal derivatizer - Google Patents
Graphite crystal derivatizer Download PDFInfo
- Publication number
- CN108467034B CN108467034B CN201810121635.5A CN201810121635A CN108467034B CN 108467034 B CN108467034 B CN 108467034B CN 201810121635 A CN201810121635 A CN 201810121635A CN 108467034 B CN108467034 B CN 108467034B
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- CN
- China
- Prior art keywords
- shielding core
- graphite
- graphite crystal
- cylinder
- shielding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 84
- 239000010439 graphite Substances 0.000 title claims abstract description 84
- 239000013078 crystal Substances 0.000 title claims abstract description 64
- 238000009434 installation Methods 0.000 claims abstract description 21
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 15
- 239000010937 tungsten Substances 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 238000000151 deposition Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229910001369 Brass Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000010951 brass Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 238000004876 x-ray fluorescence Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/223—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention relates to a graphite crystal derivative, which comprises a graphite crystal cylinder, a tungsten shielding core and a shielding core mounting cap; the graphite crystal cylinder is formed by integrally forming graphite crystals; the shielding core mounting cap is detachably connected with the graphite crystal cylinder; the tungsten shielding core is fixedly connected with the shielding core installation cap through a shielding core supporting wire, and the shielding core installation cap is connected with the graphite crystal cylinder to enable the tungsten shielding core to be located at the center of the graphite crystal cylinder. The beneficial effects of the invention are as follows: the diffractor adopts the graphite crystal cylinder formed by directly depositing in the metal cylinder, so that the working procedure of graphite cutting and bonding is omitted, and the loss is reduced; the diffractor main body is changed into a whole from two sections, so that the integrity of graphite crystals is maintained, and the installation mode of the shielding core is changed into one-end installation, so that the optimal state of graphite is maintained, and the installation of the shielding core is facilitated.
Description
Technical Field
The invention belongs to the field of material analysis, and particularly relates to a graphite crystal derivatizer.
Background
The graphite crystal pre-diffraction X-ray fluorescent instrument is a special analysis instrument in post-treatment production and research.
Conventional energy dispersive X-ray fluorescence analyzers (XRFs) typically consist of an X-ray tube, detector, spectrometer system, and data processing system. When measuring a post-treatment sample with strong radioactivity, the radioactivity of the sample can greatly increase the background of a spectrogram, and the measurement sensitivity is seriously affected.
The earliest Russian scientist developed a graphite crystal pre-diffraction X-ray fluorescence instrument, and the problem of sample radioactivity influence was solved. The atomic energy institute developed a graphite crystal pre-diffraction X-ray fluorometer in 2007 and was applied to post-treatment pilot plants in China. The core component is a graphite crystal diffractor, and the first generation of graphite diffractor structure is shown in figure 1:
A layer of graphite crystal 2 is stuck on the inner wall of a cylindrical brass shell 1, a thin steel wire is used for supporting the cylindrical brass shell at the right center, a tungsten shielding core 3 is arranged, when rays are injected into a diffractometer from one end, direct light (including the radioactive rays of a sample) is blocked by the shielding core, and X rays with specific wavelength enter a detector through the diffraction of graphite, so that the effect of reducing the radioactive background is achieved.
Graphite crystals are very fragile and difficult to machine, since the shielding core is installed in the center of the cylinder, the diffractor is made into two sections for manufacturing and assembling convenience, and the supporting wires 4 of the shielding core are pressed and fixed by screw connection. In this way, the diffractor has a graphite slit 5 in between, and this slit is in the optimum geometrical position for diffraction, which adversely affects the diffraction effect. The first generation diffractometer adopts a graphite flat plate, is cut into strips with the width of 2mm, is spliced in a brass cylinder, and needs to be very fine in cutting and bonding, and the graphite is fragile and has about 10% of loss.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a graphite crystal derivative which at least can solve the problem of influence of spliced graphite gaps on diffraction effects.
The technical scheme of the invention is as follows:
a graphite crystal derivatizer comprising a graphite crystal cylinder, a tungsten shield core, and a shield core mounting cap; the graphite crystal cylinder is formed by integrally forming graphite crystals; the shielding core mounting cap is detachably connected with the graphite crystal cylinder; the tungsten shielding core is fixedly connected with the shielding core installation cap through a shielding core supporting wire, and the shielding core installation cap is connected with the graphite crystal cylinder to enable the tungsten shielding core to be located at the center of the graphite crystal cylinder.
Further, in the graphite crystal derivative, the outer layer of the graphite crystal is provided with a shell, and the shell is detachably connected with the shielding core mounting cap.
Further, in the graphite crystal derivative, the shield core mounting cap is provided with internal threads, and the housing is provided with external threads matched with the internal threads.
Further, in the graphite crystal derivative, the shell is a copper shell.
Further, in the graphite crystal derivatizer, the number of the shielding core supporting wires is not less than 3.
Further, in the graphite crystal derivatizer, the number of the shielding core supporting wires is 4.
The beneficial effects of the invention are as follows:
The diffractor adopts the graphite crystal cylinder formed by directly depositing in the metal cylinder, so that the working procedure of graphite cutting and bonding is omitted, and the loss is reduced; the diffractor main body is changed into a whole from two sections, so that the integrity of graphite crystals is maintained, and the installation mode of the shielding core is changed into one-end installation, so that the optimal state of graphite is maintained, and the installation of the shielding core is facilitated.
Drawings
FIG. 1 is a schematic diagram of a prior art graphite crystal derivatizer.
FIG. 2 is a schematic structural view of a shield core mounting cap of a graphite crystal derivatizer of the present invention.
In the drawings, 1, a shell; 2. a graphite crystal; 3. a tungsten shield core; 4. shielding core support wires; 5. a graphite slit; 6. a shield core mounting cap; 7. and (5) an internal thread.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 2, the present invention provides a graphite crystal derivatizer comprising a graphite crystal cylinder (not shown in fig. 2), a tungsten shield core 3, and a shield core mounting cap 6; the graphite crystal cylinder is formed by integrally forming graphite crystals; the shielding core mounting cap 6 is detachably connected with the graphite crystal cylinder; the tungsten shielding core 3 is fixedly connected with the shielding core installation cap 6 through the shielding core supporting wire 4, and the tungsten shielding core 3 is positioned at the center of the graphite crystal cylinder after the shielding core installation cap 6 is connected with the graphite crystal cylinder.
The outer layer of graphite crystal is provided with a housing (not shown in the figures) which is detachably connected to the shield core mounting cap 6. The connection mode of installation cap and shell can be bolt also threaded connection, also can be joint, and this embodiment gives the example of threaded connection, be provided with the internal thread on the shielding core installation cap, be provided with on the shell with internal thread complex external screw thread.
The outer shell of the graphite crystal cylinder in this embodiment may be a metal cylinder (e.g., a copper cylinder) used to deposit graphite crystals to form the graphite crystal cylinder.
In order to secure the stability of the tungsten shield core 3, the number of shield core supporting wires in the present embodiment is not less than 3, preferably 4.
The diffractor adopts the graphite crystal cylinder formed by directly depositing in the metal cylinder, so that the working procedure of graphite cutting and bonding is omitted, and the loss is reduced; the diffractor main body is changed into a whole from two sections, so that the integrity of graphite crystals is maintained, and the installation mode of the shielding core is changed into one-end installation, so that the optimal state of graphite is maintained, and the installation of the shielding core is facilitated.
The first generation diffractometer (specific structure is described by referring to background technology) adopts a flat graphite crystal, is cut into 2mm long strips, is divided into two sections and is adhered in the middle of a cylinder, the graphite is relatively brittle, the graphite with high crystallinity is easy to be crushed in a layering way, and the whole processing process is very strict. The graphite diffractometer adopts cylindrical graphite crystals, so that the graphite cutting step is omitted, and the graphite does not need to be cut into two sections due to the thought of installing a shielding body from one end, so that the processing and installing processes of the graphite diffractometer are greatly simplified.
Through experiments, the automatic X-ray fluorescence analysis device designed and processed by the graphite diffractometer provided by the invention measures the precision of uranium by 1.2% under the conditions of 45kV and 4mA, and the detection limit is 0.15 mug/mL.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. A graphite crystal derivatizer, characterized by: comprises a graphite crystal cylinder, a tungsten shielding core (3) and a shielding core mounting cap (6); the graphite crystal cylinder is formed by integrally forming graphite crystals; the shielding core mounting cap (6) is detachably connected with the graphite crystal cylinder; the tungsten shielding core (3) is fixedly connected with the shielding core installation cap (6) through the shielding core supporting wire (4), the shielding core installation cap (6) is connected with the graphite crystal cylinder, the tungsten shielding core is located at the center of the graphite crystal cylinder, the outer layer of the graphite crystal cylinder is provided with a shell, the shell is detachably connected with the shielding core installation cap (6), the shielding core installation cap is provided with an internal thread (7), the shell is provided with an external thread matched with the internal thread, the shell is a metal cylinder, and the graphite crystal cylinder is formed in a mode of being directly deposited inside the metal cylinder.
2. The graphite crystal derivatizer of claim 1, wherein: the shell is a copper shell.
3. The graphite crystal derivatizer of any of claims 1-2, wherein: the number of the shielding core support wires (4) is not less than 3.
4. A graphite crystal derivatiser as claimed in claim 3, wherein: the number of the shielding core supporting wires (4) is 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810121635.5A CN108467034B (en) | 2018-02-07 | 2018-02-07 | Graphite crystal derivatizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810121635.5A CN108467034B (en) | 2018-02-07 | 2018-02-07 | Graphite crystal derivatizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108467034A CN108467034A (en) | 2018-08-31 |
| CN108467034B true CN108467034B (en) | 2024-05-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810121635.5A Active CN108467034B (en) | 2018-02-07 | 2018-02-07 | Graphite crystal derivatizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108467034B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709125B (en) * | 2019-01-10 | 2024-05-14 | 中国原子能科学研究院 | Shuttle-type shielding graphite crystal diffractometer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB855886A (en) * | 1957-10-26 | 1960-12-07 | Centre Nat Rech Scient | Improvements in x-ray diffractograph devices |
| CN106342216B (en) * | 2005-11-07 | 2010-11-10 | 中国原子能科学研究院 | Energy-dispersive X-ray fluorescence (EDXRF) analytical system |
| CN208103943U (en) * | 2018-02-07 | 2018-11-16 | 中国原子能科学研究院 | A kind of novel graphite crystal derivatization device |
-
2018
- 2018-02-07 CN CN201810121635.5A patent/CN108467034B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB855886A (en) * | 1957-10-26 | 1960-12-07 | Centre Nat Rech Scient | Improvements in x-ray diffractograph devices |
| CN106342216B (en) * | 2005-11-07 | 2010-11-10 | 中国原子能科学研究院 | Energy-dispersive X-ray fluorescence (EDXRF) analytical system |
| CN208103943U (en) * | 2018-02-07 | 2018-11-16 | 中国原子能科学研究院 | A kind of novel graphite crystal derivatization device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108467034A (en) | 2018-08-31 |
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