CN107899423B - Isotope enrichment target device and isotope enrichment method - Google Patents
Isotope enrichment target device and isotope enrichment method Download PDFInfo
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- CN107899423B CN107899423B CN201711152985.XA CN201711152985A CN107899423B CN 107899423 B CN107899423 B CN 107899423B CN 201711152985 A CN201711152985 A CN 201711152985A CN 107899423 B CN107899423 B CN 107899423B
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- target
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D59/00—Separation of different isotopes of the same chemical element
- B01D59/10—Separation by diffusion
Abstract
The embodiment of the invention discloses an isotope enrichment target device and an isotope enrichment method. An isotopically enriched target device comprising: a support; an active target shaft rotatably mounted to the support; the driving device is used for driving the driving target shaft to rotate; and a collecting target film connected to the active target spindle so that a portion that is isotopically enriched at the time of isotopic enrichment is wound around the active target spindle. The isotopic enrichment method comprises: disposing a collection target film in a target chamber; causing the isotope to be incident on a portion of the collection target film at the isotope enrichment site; and moving the collection target film after the isotope is incident on the portion of the collection target film at the isotope enrichment position for a predetermined time, so that the portion of the collection target film not subjected to isotope enrichment enters the isotope enrichment position to perform isotope enrichment. According to the embodiment of the invention, the situation that the isotope is saturated in the collecting target film and the collecting efficiency is reduced is avoided, and the stability of the collecting efficiency is ensured.
Description
Technical Field
Embodiments of the present invention relate to an isotope enrichment target apparatus and an isotope enrichment method.
Background
Radioisotopes of inert gases are important tracers for environmental research, e.g. in isotopes of argon39The Ar content can be used to estimate the age of groundwater or polar glaciers. However,39the abundance of Ar in the environment is extremely low, the sensitivity of the existing instrument is limited, and the abundance of Ar is difficult to directly measure accurately. For such trace isotopes, enrichment followed by measurement is an effective means for solving this problem. The common practice is: (1) extracting and purifying an inert gas from an environmental sample; (2) isotopic enrichment; (3) measurement of the abundance of the target isotope.
In the process of isotope enrichment, an electromagnetic separation technology is generally adopted to separate isotope mixtures, the isotope mixtures are respectively enriched on different positions of a collection target, and required isotopes are extracted at different positions according to requirements. When the number of atoms to be collected of the target isotope is larger, the target isotope atoms can be saturated in the collecting target, and the collection amount on the fixed target can not be continuously increased along with the increase of the incident isotope atoms, namely, the collection amount of the fixed target is very limited. .
Disclosure of Invention
It is an object of embodiments of the present invention to provide an isotope enrichment target apparatus and an isotope enrichment method, whereby, for example, the amount of collected isotopes can be increased.
According to an embodiment of the present invention, there is provided an isotope enrichment target apparatus including: a support; an active target shaft rotatably mounted to the support; the driving device is used for driving the driving target shaft to rotate; and a collecting target film, wherein the collecting target film is connected to the active target spindle so that a portion that is isotopically enriched at the time of isotopic enrichment is wound around the active target spindle.
According to an embodiment of the present invention, the isotope enriched target assembly further comprises: a driven target shaft rotatably mounted to the stand, the driven target shaft being spaced a predetermined distance from the driving target shaft, wherein a portion of the collection target film that is not isotopically enriched is wound around the driven target shaft.
According to an embodiment of the present invention, the driving device includes: a motor; a first sealed housing; an outer magnetic rotor provided outside the first hermetic case and driven to rotate by a motor; and an inner magnetic rotor disposed inside the first hermetic case, the inner magnetic rotor being rotated by rotation of the outer magnetic rotor, and the inner magnetic rotor being connected with the driving target shaft.
According to an embodiment of the invention, the outer magnetic rotor has an inner cavity, at least a portion of the first seal housing is disposed in the inner cavity of the outer magnetic rotor, and at least a portion of the inner magnetic rotor is located in the inner cavity of the outer magnetic rotor and isolated from the outer magnetic rotor by the first seal housing.
According to an embodiment of the present invention, the isotope enriched target assembly further comprises: the first flange is hermetically connected with one end of the first sealing shell, and the other end of the first sealing shell is closed;
the bracket is connected with the second flange, and the isotope enrichment target device is connected with the target chamber through the second flange; and a second seal housing connected between the first flange and the second flange, the first seal housing and the second seal housing being respectively on opposite sides of the first flange, the second seal housing and the bracket being respectively on opposite sides of the second flange, wherein the drive device further comprises: and the transmission shaft is arranged in the second sealing shell, the inner magnetic rotor passes through the through hole of the first flange and the through hole in the second flange and is connected with the driving target shaft through the transmission shaft, the inner cavity of the first sealing shell, the through hole of the first flange, the inner cavity of the second sealing shell and the through hole in the second flange are communicated, and a space isolated from the external environment is formed.
According to an embodiment of the present invention, the isotope enriched target assembly further comprises: the heating device is arranged in the inner cavity of the driven target shaft.
According to an embodiment of the present invention, the isotope enriched target assembly further comprises: the first transmission gear is connected with the driving device; and two second transmission gears respectively connected with the driving target shaft and the driven target shaft, wherein the first transmission gear is meshed with the two second transmission gears.
According to an embodiment of the invention, the support is a rectangular frame.
According to an embodiment of the present invention, the bracket is a rectangular frame, and the rectangular frame has two opposite sides, two ends of the driving target shaft are respectively connected to the two opposite sides of the rectangular frame, and two ends of the driven target shaft are respectively connected to the two opposite sides of the rectangular frame.
According to an embodiment of the invention, the active target axis and the passive target axis are parallel to each other.
According to an embodiment of the present invention, there is provided an isotope enrichment method including: disposing a collection target film in a target chamber; causing the isotope to be incident on a portion of the collection target film at the isotope enrichment site; and moving the collection target film after the isotope is incident on the portion of the collection target film at the isotope enrichment position for a predetermined time, so that the portion of the collection target film not subjected to isotope enrichment enters the isotope enrichment position to perform isotope enrichment.
According to the embodiment of the present invention, the part of the collection target film subjected to isotope enrichment at the isotope enrichment position is wound around the driving target shaft by the rotation of the driving target shaft and the driven target shaft, and the part of the collection target film not subjected to isotope enrichment wound around the driven target shaft enters the isotope enrichment position to perform isotope enrichment.
With the isotope enrichment target apparatus and the isotope enrichment method according to the embodiments of the present invention, it is possible to increase the amount of collected isotopes, for example.
Drawings
Fig. 1 is a schematic perspective view of an isotopically enriched target arrangement according to an embodiment of the present invention; and
fig. 2 is a cross-sectional view of an isotope enriched target assembly in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
An isotope enrichment target apparatus and an isotope enrichment method according to an embodiment of the present invention will be described below with reference to fig. 1 and 2.
Referring to fig. 1 to 2, an isotope enriched target apparatus 100 according to an embodiment of the present invention includes: a support 10; an active target shaft 21 rotatably mounted to the stand 10; a driving device 30 for driving the driving target shaft 21 to rotate; and a collecting target film connected to the active target spindle 21 so that a portion that is subjected to isotope enrichment at the time of isotope enrichment is wound around the active target spindle 21. The support 10 may be a rectangular frame. For example, the supporter 10 is a rectangular frame, and the rectangular frame has opposite sides to which both ends of the driving target shaft 21 are connected, respectively, and both ends of the driven target shaft 22 are connected, respectively. The driving target shaft 21 and the driven target shaft 22 may be substantially parallel to each other.
Referring to fig. 1-2, the isotopically enriched target apparatus 100 further comprises: a driven target shaft 22 rotatably installed at the stand 10, the driven target shaft 22 being spaced apart from the driving target shaft 21 by a predetermined distance, and a portion of the collection target film, which is not isotopically enriched, being wound around the driven target shaft 22. According to an exemplary embodiment of the present invention, the end of the collected target film remote from the master target spindle 21 may hang freely or otherwise tension the collected target film without the need for a slave target spindle 22.
Referring to fig. 1 to 2, the driving device 30 includes: a motor; a first sealed housing 32; an outer magnetic rotor 33 provided outside the first hermetic case 32 and the outer magnetic rotor 33 is rotated by motor driving; and an inner magnet rotor 34 disposed inside the first hermetic case 32, the inner magnet rotor 34 being rotated by the rotation of the outer magnet rotor 33, and the inner magnet rotor 34 being connected to the driving target shaft 21. For example, the outer magnet rotor 33 has an inner cavity, at least a portion of the first seal housing 32 is disposed in the inner cavity of the outer magnet rotor 33, and at least a portion of the inner magnet rotor 34 is located in the inner cavity of the outer magnet rotor 33 and isolated from the outer magnet rotor 33 by the first seal housing 32.
Referring to fig. 1-2, according to an embodiment of the present invention, the isotope enrichment target apparatus 100 further includes: a first flange 61, one end of the first sealed shell 32 is hermetically connected with the first flange 61, and the other end is closed; a second flange 62, the support 10 being connected to the second flange 62 by a connector 50, the isotope enrichment target assembly 100 being connected to the target chamber by the second flange 62; and a second seal housing 35 connected between the first flange 61 and the second flange 62, the first seal housing 32 and the second seal housing 35 being on opposite sides of the first flange 61, respectively, and the second seal housing 35 and the bracket 10 being on opposite sides of the second flange 62, respectively. The driving device 30 further includes: and a transmission shaft 36 provided in the second hermetic case 35. The inner magnet rotor 34 is coupled with the driving target shaft 21 through the through hole of the first flange 61 and the through hole of the second flange 62 by the driving shaft 36, the first driving gear 81 connected with the driving shaft 36 and the second driving gear 82 connected with the driving target shaft 21 and drives the driving target shaft 21 to rotate. The inner cavity of the first seal housing 32, the through hole of the first flange 61, the inner cavity of the second seal housing 35 and the through hole of the second flange 62 communicate with each other, and form a space isolated from the external environment. For example, the substance in the target chamber may leak into the space, but not from the space into the surrounding environment. A copper ring may be used to seal between the second flange 62 and the target chamber. The inner magnetic rotor can be made of soft magnetic materials, and demagnetization of the magnet in the baking stage is avoided. The first flange 61 may be sealed with copper rings to the first and second seal housings 32 and 35. A copper ring seal may be used between the second seal housing 35 and the second flange 62. After the motor drives the outer magnetic rotor to rotate, the motion is transmitted to the inner magnetic rotor through the magnetic force generated by the permanent magnet, so that the purpose of power transmission is achieved. According to the embodiment of the present invention, the driving target shaft 21 and the driven target shaft 22 can be connected through the target film, and the driving target shaft 21 drives the driven shaft 22 to rotate by the tension of the target film, thereby ensuring that the driving target shaft 21 and the driven target shaft 22 rotate synchronously.
Referring to fig. 1-2, according to an embodiment of the present invention, the isotope enrichment target apparatus 100 further includes: a heating device 70, the driven target shaft 22 having an inner cavity, the heating device 70 being disposed in the inner cavity of the driven target shaft 22. Before the isotope enrichment begins, a collection target film with a certain length is wound on the driven target shaft 22, a heating device such as a heating rod is placed inside the driven target shaft, the heating rod is used for baking the target film in a vacuum environment and maintaining for a period of time, and then the impurity gas on the surfaces of the driven target shaft 22 and the target film can be removed. After the heating and degassing are completed, the power switch of the heating device such as the heating rod is turned off, and the isotope enriched target device 100 is restored to the normal temperature state to perform the next enrichment operation.
Referring to fig. 1 to 2, according to an exemplary embodiment of the present invention, which is not shown, the isotope enriched target apparatus 100 further comprises: a first transmission gear 81 connected to the driving device 30; and two second transmission gears 82 respectively connected with the driving target shaft 21 and the driven target shaft 22 (only an embodiment using one second transmission gear 82 is shown in the figure, and the driving target shaft 21 and the driven target shaft 22 are respectively connected with the two second transmission gears 82 in the embodiment). The first transmission gear 81 meshes with the two second transmission gears 82. Thereby ensuring that the driving target shaft 21 and the driven target shaft 22 rotate synchronously.
An isotopic enrichment method according to an embodiment of the present invention comprises: disposing a collection target film in a target chamber; causing the isotope to be incident on a portion of the collection target film at the isotope enrichment site; and moving the collection target film after the isotope is incident on the portion of the collection target film at the isotope enrichment position for a predetermined time, so that the portion of the collection target film not subjected to isotope enrichment enters the isotope enrichment position to perform isotope enrichment.
According to an example of the present invention, the part of the collection target film that is subjected to isotope enrichment at the isotope enrichment position is wound around the driving target spindle 21 by the rotation of the driving target spindle 21 and the driven target spindle 22, and the part of the collection target film that is not subjected to isotope enrichment and is wound around the driven target spindle 22 is brought to the isotope enrichment position to perform isotope enrichment.
According to the embodiment of the invention, the length of the collecting target film can be flexibly increased by rotating the driving target shaft 21 according to the quantity of the isotopes to be collected, namely, the collecting area of the collecting target film is increased, so that the collecting quantity of the isotope atoms can be greatly improved, and the pollution of the original impurity gas in the collecting target is removed by a heating device through a heating and baking means.
In the isotope separation technology by the electromagnetic method, isotope ions with different masses can be shot into different positions of a collection target due to the difference of charge-to-mass ratios, so that the separation of isotopes is realized. The embodiment of the invention mainly aims at the enrichment of the gas isotope, can solve the problems of the saturation of the isotope in the collecting target, the reduction of the influence of impurity gas in the collecting target and the like, theoretically has no limit on the enrichment amount of the isotope, and meets the requirement of carrying out the abundance measurement after the enrichment of the trace gas isotope with extremely low abundance.
According to the embodiment of the present invention, the movement of the collection target film is controlled by the rotation of the driving target shaft 21 and the driven target shaft 22.
Before collection, a collection target film with a certain length is wound on the driven target shaft, and the other end of the collection target film is wound on the driving target shaft. The driving target shaft rotates to drive the driven target shaft to rotate simultaneously through the self-tension of the collecting target film such as an aluminum film. The rotating target shaft is fixed by using a bracket to ensure the stability of the rotating target.
The incident isotopes will be sequentially separated along the axial direction of the driving target shaft 21 and the driven target shaft 22 due to the difference in charge-to-mass ratio. Isotopes of different masses will be incident on different locations of the collection target film and deposited into the target film. The position and width of the collection target film are respectively determined by the beam incident position and the beam spot size of the isotope to be collected.
The area of the isotope collection target film is controlled by controlling the rotation of the motor. When the isotope collecting device needs to continuously collect for multiple times, the isotope corresponding to different positions can be taken out only by controlling the motor to rotate and marking the collecting positions corresponding to different collecting processes and reversely rotating the motor after the collection is finished.
According to the embodiment of the invention, the collection target area is adjusted by means of the rotation of the driving target shaft 21 and the driven target shaft 22, and a plurality of isotope enrichment experiments can be continuously completed without breaking vacuum. In addition, magnetic coupling transmission is used, the change seal is static seal, and the inner magnetic rotor uses soft magnet, so that the magnetic coupling type vacuum baking oven can be applied to ultrahigh vacuum and meets the requirement of baking in the early stage of an experiment. Further, the impurity gas in the collecting target film is removed using a heating device, and the influence of the impurity gas is minimized.
The isotope enrichment target device 100 and the isotope enrichment target method of the embodiment of the invention can be used for the enrichment of gas isotopes in the isotope separation technology by an electromagnetic method, and can be used in the trace isotope enrichment experiment of rare gas argon, thereby meeting the requirement of carrying out accurate abundance measurement after the enrichment of target isotopes.
According to the embodiment of the invention, the two driving target shafts 21 and the driven target shafts 22 which rotate synchronously are used for controlling the collecting target film to move in the vertical direction, the area of the collecting target can be controlled according to the requirement, the reduction of the collecting efficiency caused by the fact that the target isotope to be collected is saturated in the collecting target film is avoided, the stability of the collecting efficiency is ensured, and continuous and multiple collecting operations can be realized without breaking vacuum. According to the embodiment of the invention, the isotope enrichment is realized by fixing and sealing the isotope enrichment target device, removing impurity gas and controlling the thin movement of the collection target through the rotation of the driving target shaft 21 and the driven target shaft 22. According to the isotope enrichment target device and the isotope enrichment method provided by the embodiment of the invention, the operation is convenient, the collection amount is almost not limited, and the influence of impurity gas is small.
With the isotope enrichment target apparatus 100 and the isotope enrichment target method according to the embodiments of the present invention, the collection amount of isotopes is almost unlimited, and a plurality of experiments can be continuously performed without breaking vacuum as long as isotopes for different experiments are collected at different positions by rotating the driving target spindle 21 and the driven target spindle 22.
By adopting the isotope enrichment target device 100 and the isotope enrichment target method provided by the embodiment of the invention, multiple experiments can be continuously carried out, the experiment preparation stages of repeatedly breaking vacuum and baking are reduced, and the working efficiency and the experiment stability are greatly improved. Therefore, the result of the known content isotope can be collected at a certain position of the target film for calibration of the unknown experimental result.
Claims (7)
1. An isotopically enriched target device, comprising:
a support;
an active target shaft rotatably mounted to the support;
the driving device is used for driving the driving target shaft to rotate;
a collection target film, wherein the collection target film is connected to the active target spindle so that a portion that is isotopically enriched at the time of isotopic enrichment is wound around the active target spindle; and
a driven target shaft rotatably mounted to the stand, the driven target shaft being spaced apart from the driving target shaft by a predetermined distance, and a portion of the collected target film between the driving target shaft and the driven target shaft being disposed in a vertical direction,
wherein the portion of the collection target film that is not isotopically enriched is wound around a driven target shaft,
the driving device includes:
a motor;
a first sealed housing;
an outer magnetic rotor provided outside the first hermetic case and driven to rotate by a motor;
an inner magnetic rotor disposed inside the first hermetic case, the inner magnetic rotor rotating by the rotation of the outer magnetic rotor and connected with the driving target shaft,
the outer magnetic rotor has an inner cavity, at least a portion of the first seal housing is disposed in the inner cavity of the outer magnetic rotor, and at least a portion of the inner magnetic rotor is located in the inner cavity of the outer magnetic rotor and isolated from the outer magnetic rotor by the first seal housing,
the isotopically enriched target device further comprises:
the first flange is hermetically connected with one end of the first sealing shell, and the other end of the first sealing shell is closed;
the bracket is connected with the second flange, and the isotope enrichment target device is connected with the target chamber through the second flange;
the second sealing shell is connected between the first flange and the second flange, the first sealing shell and the second sealing shell are respectively arranged at two opposite sides of the first flange, and the second sealing shell and the bracket are respectively arranged at two opposite sides of the second flange; and
the transmission shaft is arranged in the second sealed shell, the inner magnetic rotor is connected with the driving target shaft through the through hole of the first flange and the through hole of the second flange by the transmission shaft,
the inner cavity of the first sealing shell, the through hole of the first flange, the inner cavity of the second sealing shell and the through hole in the second flange are communicated, and a space isolated from the external environment is formed.
2. The isotopically enriched target device of claim 1, further comprising:
the heating device is arranged in the inner cavity of the driven target shaft.
3. The isotopically enriched target device of claim 1, further comprising:
the first transmission gear is connected with the driving device; and
two second transmission gears respectively connected with the driving target shaft and the driven target shaft,
wherein the first transmission gear is meshed with the two second transmission gears.
4. The isotopically enriched target device of claim 1, wherein:
the support is a rectangular frame.
5. The isotopically enriched target device of claim 1, wherein:
the bracket is a rectangular frame, the rectangular frame is provided with two opposite sides,
two ends of the driving target shaft are respectively connected to the two opposite sides of the rectangular frame, and two ends of the driven target shaft are respectively connected to the two opposite sides of the rectangular frame.
6. The isotopically enriched target device of claim 1, wherein:
the driving target shaft and the driven target shaft are parallel to each other.
7. A method of isotopic enrichment using the isotopically enriched target assembly of claim 1, comprising:
disposing a collection target film in a target chamber;
causing the isotope to be incident on a portion of the collection target film at the isotope enrichment site; and
moving the collecting target film after the isotope is incident on the portion of the collecting target film at the isotope enrichment site for a predetermined time to bring the portion of the collecting target film which is not subjected to the isotope enrichment into the isotope enrichment site to perform the isotope enrichment,
wherein the part of the collecting target film between the driving target shaft and the driven target shaft is arranged along the vertical direction, the part of the collecting target film which is subjected to isotope enrichment and is at the isotope enrichment position is wound on the driving target shaft through the rotation of the driving target shaft and the driven target shaft, and the part of the collecting target film which is not subjected to isotope enrichment and is wound on the driven target shaft enters the isotope enrichment position to perform isotope enrichment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711152985.XA CN107899423B (en) | 2017-11-16 | 2017-11-16 | Isotope enrichment target device and isotope enrichment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711152985.XA CN107899423B (en) | 2017-11-16 | 2017-11-16 | Isotope enrichment target device and isotope enrichment method |
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| CN107899423A CN107899423A (en) | 2018-04-13 |
| CN107899423B true CN107899423B (en) | 2020-05-22 |
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| CN201711152985.XA Active CN107899423B (en) | 2017-11-16 | 2017-11-16 | Isotope enrichment target device and isotope enrichment method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1092448B (en) * | 1959-03-19 | 1960-11-10 | Dr Kurt Diebner | Device for isotope separation in the gas phase |
| CN2484177Y (en) * | 2001-06-02 | 2002-04-03 | 李宏伟 | Rolling desk calendar |
| CN105403613A (en) * | 2015-10-23 | 2016-03-16 | 中国科学技术大学 | Vacuum step heating and element-isotope enrichment analysis apparatus |
| CN106494919A (en) * | 2015-09-06 | 2017-03-15 | 广西大学 | A kind of Electromechanical Control brushing automatically updates mechanism |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6054333A (en) * | 1997-10-14 | 2000-04-25 | University Of Houston | Real time etch measurements and control using isotopes |
| CN105976871B (en) * | 2016-06-06 | 2017-07-18 | 中国工程物理研究院核物理与化学研究所 | A kind of processing method of fusion-fission hybrid reactor fusion target chamber product |
-
2017
- 2017-11-16 CN CN201711152985.XA patent/CN107899423B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1092448B (en) * | 1959-03-19 | 1960-11-10 | Dr Kurt Diebner | Device for isotope separation in the gas phase |
| CN2484177Y (en) * | 2001-06-02 | 2002-04-03 | 李宏伟 | Rolling desk calendar |
| CN106494919A (en) * | 2015-09-06 | 2017-03-15 | 广西大学 | A kind of Electromechanical Control brushing automatically updates mechanism |
| CN105403613A (en) * | 2015-10-23 | 2016-03-16 | 中国科学技术大学 | Vacuum step heating and element-isotope enrichment analysis apparatus |
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