CN114200508A - Neutron detector - Google Patents
Neutron detector Download PDFInfo
- Publication number
- CN114200508A CN114200508A CN202111416717.0A CN202111416717A CN114200508A CN 114200508 A CN114200508 A CN 114200508A CN 202111416717 A CN202111416717 A CN 202111416717A CN 114200508 A CN114200508 A CN 114200508A
- Authority
- CN
- China
- Prior art keywords
- insulating
- neutron detector
- kovar
- tube
- core
- 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.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention provides a neutron detector which comprises an inner barrel (1) and an outer barrel (2), wherein the inner barrel (1) is positioned inside the outer barrel (2), the inner barrel (1) comprises a central electrode (11) and an outer electrode (12), the central electrode (11) comprises a core body (111), the outer electrode (12) comprises an inner barrel outer wall (121), a cavity (13) is arranged between the core body (111) and the inner barrel outer wall (121), working gas is arranged in the cavity (13), the outer wall of the core body (111) is provided with a coating, and the coating is made of fissile materials. The neutron detector provided by the invention has the advantages of reasonable structural design and simple assembly, can realize miniaturization, and can improve the detection precision of the neutron fluence rate.
Description
Technical Field
The invention relates to a neutron detector, in particular to a neutron fluence rate detector for a nuclear reactor core.
Background
The reactor core measuring system is one of important components of the reactor and is mainly used for measuring the neutron fluence rate, the water level and the temperature of the reactor core, providing a three-dimensional distribution map of the neutron fluence rate in the reactor and providing a thermocouple signal required by a reactor core cooling condition monitor after an accident.
A miniature fission chamber neutron detector is one of the important components of a core measurement system for measuring the neutron fluence rate of the core. The miniature fission chamber neutron detector can convert nuclear signals of the reactor into electric signals, so that the neutron quantity of a specified position in the reactor can be measured. The working principle is as follows: when the neutrons strike fissile materials in the fission chamber to generate fission fragments, the fragments are ionized in working gas to generate current signals, the current magnitude is directly related to the neutron number, and the measurement of the neutron number is realized by collecting the current signals.
Chinese patent document CN112420230A discloses an in-core neutron detector assembly which penetrates through the top cover of a pressure vessel, the detector assembly comprising a core including a plurality of fission chambers sensitive to neutrons, the fission chambers being located in the active section of the core. This patent is convenient for nuclear power plant to load at the reactor core for the first time and reach critical in-process and cancel the neutron source once, monitors whole reactor core state through the neutron of monitoring new fuel assembly spontaneous fission production, ensures nuclear reactor's security.
Chinese patent document CN105513657A discloses an integrated core measuring assembly introduced into a core from a reactor pressure vessel head, comprising an upper shell located outside the reactor pressure vessel, an outer shell located inside the reactor pressure vessel, a plurality of neutron fluence rate meters for detecting axial power distribution of the core, and a thermocouple for measuring the core outlet temperature; the neutron fluence rate measurer and the thermocouple are both arranged in the shell, and the shell ensures that the neutron fluence rate measurer and the thermocouple are not in contact with a primary circuit coolant. The integrated reactor core measuring component of the nuclear power station is introduced into a reactor core from a top cover of a reactor pressure vessel, and meets the design requirements of an advanced reactor; and the reactor core outlet temperature and the reactor core neutron fluence rate can be measured simultaneously, the number of holes of the reactor pressure vessel is reduced, and the safety of reactor design can be improved.
However, none of the above prior art discloses a structural optimization scheme of the neutron detector, and the structural design of the neutron detector in the prior art has defects, which is not favorable for realizing miniaturization, and has a certain reliability problem as well as low detection precision for the neutron fluence rate.
Disclosure of Invention
The invention mainly aims to provide a neutron detector to solve the problems in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a neutron detector, including an inner tube and an outer tube, the inner tube being located inside the outer tube, the inner tube including a central electrode and an outer electrode, the central electrode including a core, the outer electrode including an inner tube outer wall, a chamber being provided between the core and the inner tube outer wall, and a working gas being provided in the chamber, characterized in that the outer wall of the core is provided with a plating layer, and the plating layer is made of a fissile material.
Further, the central electrode further comprises an inner central electrode lead, the core is a hollow tubular structure, and at least one part of the inner central electrode lead is located inside the core.
Furthermore, the two ends of the inner cylinder are provided with insulating supports for supporting the core body, the insulating supports are of cylindrical sleeve structures, and the two ends of the core body are embedded in the insulating supports.
Further, still including insulating kovar, insulating kovar is located inside the urceolus, the one end of inner tube with insulating kovar forms airtight connection.
Further, insulating kovar radially from inside to outside includes insulating kovar inner core, insulating kovar pottery and insulating kovar outer tube, insulating kovar outer tube with the inner tube outer wall forms bushing structure and welded connection.
Further, the inner center electrode lead is welded to the end face of the insulated kovar inner core close to the core.
Further, still include insulating ring and outside center electrode lead wire, the insulating ring is located inside the urceolus, the insulating ring with insulating kovar is adjacent, outside center electrode lead wire passes the insulating ring and welds keeping away from of insulating kovar inner core the terminal surface of core.
Further, still include cable assembly interface, cable assembly interface sets up the neutron detector is close to the tip of insulating ring.
Further, still include the adaptor of bleeding, the one end of inner tube outer wall of keeping away from insulating kovar with the adaptor of bleeding is airtight connection.
Furthermore, still include kovar exhaust tube, the adaptor welded connection of bleeding to kovar exhaust tube, kovar exhaust tube one end has the welding to press from both sides and seals.
Furthermore, the middle part of the air exhaust adapter is provided with a through hole, the through hole of the air exhaust adapter is communicated with the internal channel of the insulating support, and at least part of the through hole of the air exhaust adapter accommodates the Kovar exhaust tube.
Furthermore, the two insulation supports are respectively a first insulation support and a second insulation support, the second insulation support is arranged adjacent to the air exhaust adapter, and a chamfer is arranged on the inner wall of one end, close to the air exhaust adapter, of the second insulation support.
Further, still include spacing mounting, spacing mounting connect in the adaptor of bleeding.
The neutron detector further comprises an outer end head, the outer end head is conical, the outer end head is connected to one end, adjacent to the limiting fixing piece, of the outer barrel, the outer end head is connected with the outer barrel in an airtight mode, and the outer end head and the outer barrel form a shell of the neutron detector.
Further, the outer end head is axially provided with an outer end head exhaust pipe, and one end of the outer end head exhaust pipe is provided with a welding clamp seal.
Furthermore, the air exhaust adaptor, the Kovar exhaust tube and the limiting fixing piece are all located inside the shell.
Further, a protective gas is arranged between the outer cylinder and the inner cylinder.
Further, the fissionable material is uranium oxide with abundance of more than 90%, and the thickness of the coating is 0.2-0.6mg/cm2。
Further, theThe fissionable material is235U。
Further, the working gas is 95% argon and 5% nitrogen.
Further, the pressure of the working gas is 130kPa to 150 kPa.
By applying the technical scheme of the invention, at least the following beneficial effects are obtained:
1. the neutron detector has reasonable structural design, can realize sequential assembly from inside to outside, and has low manufacturing cost and high reliability;
2. according to the neutron detector, the coating is arranged on the outer wall of the hollow core body and is used as a part of the central electrode, so that thermal neutron bombardment can be received more effectively, and the accuracy and the sensitivity of neutron detection can be improved;
3. the neutron detector can realize miniaturization, and is beneficial to measuring the neutron fluence rate of the reactor core in the reactor core thimble;
4. according to the neutron detector, through the optimized design of the structure, if the chamfer angle is arranged on the inner wall close to one end of the insulating support of the air exhaust adapter, the installation and the positioning can be more accurate, and the reliability of the device is further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic structural view of embodiment 1 of a neutron detector according to the present invention; and
fig. 2 shows a schematic structural view of an insulated kovar in embodiment 1 of a neutron detector according to the present invention.
Wherein the figures include the following reference numerals:
1. the inner tube, 11, a center electrode, 111, a core body, 112, an inner center electrode lead wire, 113, an outer center electrode lead wire, 12, an outer electrode, 121, an inner tube outer wall 13, a cavity, 2, an outer tube, 3, an insulating support, 31, a first insulating support, 32, a second insulating support, 4, an insulating kovar, 41, an insulating kovar inner core, 42, insulating kovar ceramic, 43, an insulating kovar outer tube, 5, an insulating ring, 6, a cable assembly interface, 7, an air extraction adapter, 8, a kovar exhaust tube, 9, a limiting fixing piece, 10, an outer end head, 101, an outer end head exhaust tube, 20 and a cable assembly sealing structure.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The present invention is described in further detail below with reference to specific examples, which are not to be construed as limiting the scope of the invention as claimed.
Example 1
The utility model provides a neutron detector, includes inner tube 1 and urceolus 2, inner tube 1 is located the inside of urceolus 2, inner tube 1 includes central electrode 11 and outer electrode 12, central electrode 11 includes core 111, outer electrode 12 includes inner tube outer wall 121, core 111 with chamber 13 has between the inner tube outer wall 121, working gas has in the chamber 13, its characterized in that, the outer wall of core 111 is equipped with the cladding material, the cladding material comprises fissile material.
Further, the fissionable material is uranium oxide with abundance of more than 90%, and the thickness of the coating is 0.2-0.6mg/cm2. Preferably, the thickness of the plating layer is 0.4mg/cm2。
Further, the fissionable material is235U。
Further, the working gas is 95% argon and 5% nitrogen.
Further, the pressure of the working gas is 150 kPa.
The potential difference between the outer electrode and the central electrode is the polarization voltage, and when the thermal neutrons pass through the fission chamber, the thermal neutrons are in contact with the energy of the thermal neutrons in the fission chamber235U is subjected to a fission reaction, and the fission reaction,235the fragment FQ from the U fission ionizes the argon:
Ar+FQ→Ar++e-
because of the potential difference between the two electrodes, the positive and negative ions drift towards the two electrodes respectively, and an induction current is formed in the loop.
Further, the central electrode 11 further includes an inner central electrode lead 112, the core 111 is a hollow tubular structure, and at least a portion of the inner central electrode lead 112 is located inside the core 111.
Furthermore, the two ends of the inner cylinder 1 are provided with insulating supports 3 for supporting the core body 111, the insulating supports 3 are cylindrical sleeve structures, and the two ends of the core body 111 are embedded in the insulating supports 3.
Further, still include insulating kovar 4, insulating kovar 4 is located inside outer tube 2, the one end of inner tube 1 with insulating kovar 4 forms airtight connection.
Further, the insulating kovar 4 comprises an insulating kovar inner core 41, insulating kovar ceramic 42 and an insulating kovar outer pipe 43 from inside to outside in the radial direction, and the insulating kovar outer pipe 43 and the inner cylinder outer wall 121 form a sleeve structure and are connected in a welding mode.
Further, the inner center electrode lead 112 is welded to the end surface of the insulated kovar inner core 41 near the core 111.
Further, still include insulating ring 5 and outside center electrode lead wire 113, insulating ring 5 is located inside urceolus 2, insulating ring 5 with insulating kovar 4 is adjacent, outside center electrode lead wire 113 passes insulating ring 5 and welds in the terminal surface of keeping away from of insulating kovar inner core 41 core 111.
The central electrode lead 112 is connected to a coaxial cable connected with the neutron detector through the insulated kovar 4 and the insulated ring 5, and the coaxial cable is used for connecting with external detection equipment.
Further, the neutron detector further comprises a cable assembly interface 6, wherein the cable assembly interface 6 is arranged at the end part of the neutron detector close to the insulating ring 4.
The cable assembly interface 6 is connected with the cable assembly sealing structure 20, and the connection between the coaxial cable and the neutron detector is formed through the cable assembly sealing structure 20.
Further, the air-extracting adapter 7 is further included, and one end, far away from the insulating kovar 4, of the inner cylinder outer wall 121 is connected with the air-extracting adapter 7 in an airtight mode.
Further, still include kovar exhaust tube 8, bleed adaptor 7 welded connection to kovar exhaust tube 8, kovar exhaust tube 8 one end has the welding to press from both sides to seal.
Furthermore, the middle part of the air exhaust adapter 7 is provided with a through hole, the through hole of the air exhaust adapter 7 is communicated with the internal channel of the insulating support 3, and at least part of the through hole of the air exhaust adapter 7 accommodates the Kovar exhaust tube 8.
The insulating Kovar 4, the inner cylinder outer wall 121, the air exhaust adaptor 7 and the Kovar exhaust tube 8 form a fission chamber assembly structure, and an airtight space is formed inside the fission chamber assembly structure. In the assembling process, the operation of vacuumizing and filling working gas can be carried out through the Kovar exhaust tube 8, and finally the fission chamber assembly structure is sealed by clamping and welding the Kovar exhaust tube 8.
Further, the two insulation supports 3 are respectively a first insulation support 31 and a second insulation support 32, the second insulation support 32 is arranged adjacent to the air exhaust adapter 7, and a chamfer is arranged on the inner wall of one end, close to the air exhaust adapter 7, of the second insulation support 32.
The setting of chamfer is favorable to bleeding adaptor 7 and kovar exhaust tube 8's installation and location more accurate in the assembling process.
Further, the air exhaust adapter further comprises a limiting fixing piece 9, and the limiting fixing piece 9 is connected to the air exhaust adapter 7.
Further, the neutron detector further comprises an outer end head 10, the outer end head 10 is conical, the outer end head 10 is connected to one end, adjacent to the limiting fixing piece 9, of the outer cylinder 2, the outer end head 10 is in airtight connection with the outer cylinder 2, and the outer end head 10 and the outer cylinder 2 form a shell of the neutron detector.
Further, the outer end head 10 has an outer end head air exhaust pipe 101 in the axial direction, and one end of the outer end head air exhaust pipe 101 has a welding clamp seal.
Further, the air exhaust adaptor 7, the Kovar exhaust tube 8 and the limiting fixing piece 9 are all located inside the shell.
Further, a protective gas is provided between the outer cylinder 2 and the inner cylinder 1.
The outer end head 10, the outer barrel 2 and the cable assembly sealing structure 20 form an airtight structure of the outer layer of the neutron detector. In the assembling process, the operations of vacuumizing and filling protective gas can be performed through the outer end extraction tube 101, and then the outer end extraction tube 101 is clamped and welded to complete the assembly of the neutron detector.
Example 2
The utility model provides a neutron detector, includes inner tube 1 and urceolus 2, inner tube 1 is located the inside of urceolus 2, inner tube 1 includes central electrode 11 and outer electrode 12, central electrode 11 includes core 111, outer electrode 12 includes inner tube outer wall 121, core 111 with chamber 13 has between the inner tube outer wall 121, working gas has in the chamber 13, its characterized in that, the outer wall of core 111 is equipped with the cladding material, the cladding material comprises fissile material.
Further, the fissionable material is uranium oxide with abundance of more than 90%, and the thickness of the coating is 0.5mg/cm2。
Further, the fissionable material is235U。
Further, the working gas is 95% argon and 5% nitrogen.
Further, the pressure of the working gas is 130 kPa.
The potential difference between the outer electrode and the central electrode is the polarization voltage, and when the thermal neutrons pass through the fission chamber, the thermal neutrons are in contact with the energy of the thermal neutrons in the fission chamber235U is subjected to a fission reaction, and the fission reaction,235the fragment FQ from the U fission ionizes the argon:
Ar+FQ→Ar++e-
because of the potential difference between the two electrodes, the positive and negative ions drift towards the two electrodes respectively, and an induction current is formed in the loop.
Further, the central electrode 11 further includes an inner central electrode lead 112, the core 111 is a hollow tubular structure, and at least a portion of the inner central electrode lead 112 is located inside the core 111.
Furthermore, the two ends of the inner cylinder 1 are provided with insulating supports 3 for supporting the core body 111, the insulating supports 3 are cylindrical sleeve structures, and the two ends of the core body 111 are embedded in the insulating supports 3.
Further, still include insulating kovar 4, insulating kovar 4 is located inside outer tube 2, the one end of inner tube 1 with insulating kovar 4 forms airtight connection.
Further, the insulating kovar 4 comprises an insulating kovar inner core 41, insulating kovar ceramic 42 and an insulating kovar outer pipe 43 from inside to outside in the radial direction, and the insulating kovar outer pipe 43 and the inner cylinder outer wall 121 form a sleeve structure and are connected in a welding mode.
Further, the inner center electrode lead 112 is welded to the end surface of the insulated kovar inner core 41 near the core 111.
Further, still include insulating ring 5 and outside center electrode lead wire 113, insulating ring 5 is located inside urceolus 2, insulating ring 5 with insulating kovar 4 is adjacent, outside center electrode lead wire 113 passes insulating ring 5 and welds in the terminal surface of keeping away from of insulating kovar inner core 41 core 111.
The central electrode lead 112 is connected to a coaxial cable connected with the neutron detector through the insulated kovar 4 and the insulated ring 5, and the coaxial cable is used for connecting with external detection equipment.
Further, the neutron detector further comprises a cable assembly interface 6, wherein the cable assembly interface 6 is arranged at the end part of the neutron detector close to the insulating ring 4.
The cable assembly interface 6 is connected with the cable assembly sealing structure 20, and the connection between the coaxial cable and the neutron detector is formed through the cable assembly sealing structure 20.
Further, the air-extracting adapter 7 is further included, and one end, far away from the insulating kovar 4, of the inner cylinder outer wall 121 is connected with the air-extracting adapter 7 in an airtight mode.
Compared with embodiment 1, the neutron detector in this embodiment may omit the kovar extraction tube 8 and the extraction adapter 9, and meet the structural requirements of the neutron detector through adaptive structural modification (not shown in the figure).
The insulating kovar 4, the inner cylinder outer wall 121 and the air exhaust adapter 7 form a fission chamber assembly structure, and an airtight space is formed inside the fission chamber assembly structure. In the assembling process, the operations of vacuumizing and filling working gas can be carried out through the air exhaust adapter 7, and finally the fission chamber assembly structure is sealed through clamping and sealing and welding the air exhaust adapter 7.
Further, the two insulation supports 3 are respectively a first insulation support 31 and a second insulation support 32, the second insulation support 32 is arranged adjacent to the air exhaust adapter 7, and a chamfer is arranged on the inner wall of one end, close to the air exhaust adapter 7, of the second insulation support 32.
The setting of chamfer is favorable to bleeding the installation and the location of adaptor 7 more accurate in the assembling process.
Further, the neutron detector comprises an outer end head 10, wherein the outer end head 10 is conical, the outer end head 10 is connected to one end, adjacent to the air exhaust adapter 7, of the outer barrel 2, the outer end head 10 is in airtight connection with the outer barrel 2, and the outer end head 10 and the outer barrel 2 form a shell of the neutron detector.
Further, the outer end head 10 has an outer end head air exhaust pipe 101 in the axial direction, and one end of the outer end head air exhaust pipe 101 has a welding clamp seal.
Further, the suction adapter 7 is located inside the housing.
Further, a protective gas is provided between the outer cylinder 2 and the inner cylinder 1.
The outer end head 10, the outer barrel 2 and the cable assembly sealing structure 20 form an airtight structure of the outer layer of the neutron detector. In the assembling process, the operations of vacuumizing and filling protective gas can be performed through the outer end extraction tube 101, and then the outer end extraction tube 101 is clamped and welded to complete the assembly of the neutron detector.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the neutron detector has reasonable structural design, can realize sequential assembly from inside to outside, and has low manufacturing cost and high reliability;
2. according to the neutron detector, the coating is arranged on the outer wall of the hollow core body and is used as a part of the central electrode, so that thermal neutron bombardment can be received more effectively, and the accuracy and the sensitivity of neutron detection can be improved;
3. the neutron detector can realize miniaturization, and is beneficial to measuring the neutron fluence rate of the reactor core in the reactor core thimble;
4. according to the neutron detector, through the optimized design of the structure, if the chamfer angle is arranged on the inner wall close to one end of the insulating support of the air exhaust adapter, the installation and the positioning can be more accurate, and the reliability of the device is further improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (21)
1. A neutron detector comprises an inner barrel (1) and an outer barrel (2), wherein the inner barrel (1) is located inside the outer barrel (2), the inner barrel (1) comprises a central electrode (11) and an outer electrode (12), the central electrode (11) comprises a core body (111), the outer electrode (12) comprises an inner barrel outer wall (121), a cavity (13) is arranged between the core body (111) and the inner barrel outer wall (121), and working gas is arranged in the cavity (13), and the neutron detector is characterized in that the outer wall of the core body (111) is provided with a coating which is made of fissionable materials.
2. The neutron detector of claim 1, wherein the center electrode (11) further comprises an inner center electrode lead (112), the core (111) is a hollow tubular structure, and at least a portion of the inner center electrode lead (112) is located inside the core (111).
3. The neutron detector according to claim 1 or 2, characterized in that insulating supports (3) for supporting the core body (111) are arranged at two ends of the inner cylinder (1), the insulating supports (3) are cylindrical sleeve structures, and two ends of the core body (111) are embedded in the insulating supports (3).
4. The neutron detector of claim 3, characterized in that it further comprises an insulating valve (4), the insulating valve (4) being located inside the outer tube (2), one end of the inner tube (1) forming a gas-tight connection with the insulating valve (4).
5. The neutron detector of claim 4, characterized in that the insulating kovar (4) comprises, radially from the inside to the outside, an insulating kovar inner core (41), an insulating kovar ceramic (42) and an insulating kovar outer tube (43), the insulating kovar outer tube (43) forming a sleeve structure with the inner tube outer wall (121) and being welded.
6. The neutron detector of claim 5, wherein the inner center electrode lead (112) is welded to an end face of the insulated kovar inner core (41) proximate to the core (111).
7. The neutron detector of claim 6, further comprising an insulating ring (5) and an outer center electrode lead (113), the insulating ring (5) being located inside the outer tube (2), the insulating ring (5) being adjacent to the insulating kovar (4), the outer center electrode lead (113) passing through the insulating ring (5) and being welded to an end face of the insulating kovar core (41) distal from the core (111).
8. The neutron detector of claim 7, further comprising a cable assembly interface (6), the cable assembly interface (6) being disposed at an end of the neutron detector proximate to the insulating ring (4).
9. The neutron detector of any of claims 4 to 8, further comprising an extraction adapter (7), wherein an end of the inner cylinder outer wall (121) distal from the insulated covar (4) is hermetically connected to the extraction adapter (7).
10. The neutron detector of any of claim 9, further comprising a Kovar exhaust tube (8), the exhaust adapter (7) being welded to the Kovar exhaust tube (8), the Kovar exhaust tube (8) having a welded pinch seal at one end.
11. The neutron detector of claim 10, wherein a through hole is provided in the middle of the extraction adapter (7), the through hole of the extraction adapter (7) is communicated with the internal channel of the insulating support (3), and the kovar extraction tube (8) is at least partially accommodated in the through hole of the extraction adapter (7).
12. The neutron detector of claim 11, wherein the two insulating supports (3) are a first insulating support (31) and a second insulating support (32), respectively, the second insulating support (32) being arranged adjacent to the pumping adaptor (7), and an inner wall of the second insulating support (32) near one end of the pumping adaptor (7) being provided with a chamfer.
13. The neutron detector of claim 12, further comprising a spacing fixture (9), the spacing fixture (9) being connected to the pumping adaptor (7).
14. The neutron detector of claim 13, further comprising an outer end (10), wherein the outer end (10) is tapered, the outer end (10) is connected to an end of the outer tube (2) adjacent to the spacing fixture (9), the outer end (10) is hermetically connected to the outer tube (2), and the outer end (10) and the outer tube (2) form a shell of the neutron detector.
15. The neutron detector of claim 14, wherein the outer end head (10) has an outer end head extraction tube (101) axially, and the outer end head extraction tube (101) has a welded clamp seal at one end.
16. The neutron detector of claim 15, wherein the extraction adapter (7), the kovar extraction tube (8), and the spacing fixture (9) are all located inside the housing.
17. The neutron detector of claim 1 or 2, characterized in that a shielding gas is present between the outer tube (2) and the inner tube (1).
18. The neutron detector of claim 1 or 2, wherein the fissionable material is uranium oxide in an abundance greater than 90%, and the coating has a thickness of 0.2-0.6mg/cm2。
19. The neutron detector of claim 18, wherein the fissionable material is235U。
20. The neutron detector of claim 1 or 2, wherein the working gas is 95% argon and 5% nitrogen.
21. The neutron detector of claim 20, wherein the pressure of the working gas is 130kPa to 150 kPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111416717.0A CN114200508A (en) | 2021-11-25 | 2021-11-25 | Neutron detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111416717.0A CN114200508A (en) | 2021-11-25 | 2021-11-25 | Neutron detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114200508A true CN114200508A (en) | 2022-03-18 |
Family
ID=80649040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111416717.0A Pending CN114200508A (en) | 2021-11-25 | 2021-11-25 | Neutron detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114200508A (en) |
-
2021
- 2021-11-25 CN CN202111416717.0A patent/CN114200508A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110148550A (en) | High range area radiation monitor ionization chamber after a kind of accident | |
| CN102768867A (en) | Electrical penetration piece with ceramic sealing electrode | |
| JPS5824746B2 (en) | Housohifukuden Ribako | |
| CN114200508A (en) | Neutron detector | |
| CN109041397A (en) | A kind of microminiature neutron tube | |
| CN112837835B (en) | Probe protection device and high-temperature fission chamber with same | |
| CN209947795U (en) | Post-accident high-range area radiation monitoring ionization chamber | |
| JP2001272495A (en) | Reactor power monitor | |
| CN112803225A (en) | Non-glass device for laser gyro connection exhaust platform | |
| CN110954936B (en) | Tritium measuring device based on well-shaped ionization chamber | |
| CA3157602A1 (en) | Self-powered excore detector arrangement for measuring flux of a nuclear reactor core | |
| CN219105835U (en) | Insulator assembly for 1L ionization chamber | |
| CN219105836U (en) | Insulator assembly for 3L ionization chamber | |
| JP4776599B2 (en) | Film forming apparatus and film forming method | |
| CN202650561U (en) | Electrical penetration piece with ceramic seal electrode | |
| CN220340415U (en) | High stability neutron proportional counter tube structure | |
| RU53456U1 (en) | DIRECT CHARGE NEUTRON DETECTOR | |
| CN220367423U (en) | Ionization chamber structure for measuring activity | |
| CA1214289A (en) | Miniature fission chamber and signal cable assembly | |
| CN219778534U (en) | Low neutron flux detector | |
| CN211929779U (en) | Sealing tail accessory | |
| CN215494161U (en) | High-stability transmission-type monitoring ionization chamber | |
| RU58732U1 (en) | IONIZATION DIVISION CAMERA | |
| CN216670289U (en) | Double-layer hydrogen-containing proportional counter for neutron spectrum measurement | |
| CN116646100A (en) | Fission ionization chamber for measuring neutron flux outside reactor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |