CN112764088B - Neutron detector with calibration function - Google Patents
Neutron detector with calibration function Download PDFInfo
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- CN112764088B CN112764088B CN202011542148.XA CN202011542148A CN112764088B CN 112764088 B CN112764088 B CN 112764088B CN 202011542148 A CN202011542148 A CN 202011542148A CN 112764088 B CN112764088 B CN 112764088B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/005—Details of radiation-measuring instruments calibration techniques
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention belongs to the technical field of nuclear radiation detection, and particularly relates to a neutron detector with a calibration function, which comprises a detection device, a double-shielded cable, a neutron source, a preamplifier, a mounting plate, a source detection base and a source detection device, wherein: the detection device is connected with the preamplifier through a double-shielded cable; the preamplifier is fixed below the mounting plate; the source detection base is fixed above the mounting plate; the source detection device is fixed above the source detection base, and the neutron source is arranged in the source detection device; the neutron source in the source detection device can vertically move up and down. The neutron detector with the calibration function has strong anti-interference capability, enhances the electromagnetic shielding performance of the system, avoids the safety risk of a straight radioactive source of personnel, reduces the radiation damage to operators in the process of leading the radioactive source in and out, and ensures the operability of calibration in the use process of the neutron detector with the calibration function.
Description
Technical Field
The invention belongs to the technical field of nuclear radiation detection, and particularly relates to a neutron detector with a calibration function.
Background
The neutron detector mainly utilizes secondary particles generated by the action of neutrons and some atomic nuclei (including nuclear reaction, nuclear fission or nuclear recoil) mixed in the detector to carry out measurement, and is widely applied to a reactor nuclear power measurement, a reactor core neutron fluence rate distribution measurement or a fuel damage delayed neutron monitoring system.
When the conventional neutron detector is used, a signal ground is in a direct connection state with the ground, the interference resistance is poor, the neutron detector is easily influenced by the surrounding electromagnetic environment, a worker can directly face a radioactive source for a long time to cause radiation damage, and in addition, the conventional neutron detector with the calibration function is not provided with a calibration source for periodic calibration or a matched calibration source, so that the operation is inconvenient, and the periodic calibration of field equipment is influenced.
Disclosure of Invention
Aiming at the problems in the background art, the invention provides a neutron detector with a calibration function, which can enhance the electromagnetic shielding performance of a system, reduce the radiation damage of a radiation source to workers and realize the automatic calibration of the detector.
The invention provides a neutron detector with a calibration function, which comprises a detection device, a double-shielded cable, a neutron source, a preamplifier, a mounting plate, a source detection base and a source detection device, wherein the detection device comprises: the detection device is connected with the preamplifier through a double-shielded cable; the preamplifier is fixed below the mounting plate; the source detection base is fixed above the mounting plate; the source detection device is fixed above the source detection base, and the neutron source is arranged in the source detection device; the neutron source in the source detection device can vertically move up and down.
Further, the detection device comprises a neutron detector installation vertical shaft, a neutron detector shell and a neutron detector core.
Further, a cable protection corrugated pipe is arranged on the outer side of the double-shielded cable.
Further, the preamplifier includes a preamplifier circuit and a preamplifier housing.
Furthermore, the source inspection base comprises a fixed seat, a shielding cylinder and a supporting device.
Furthermore, the inside of the shielding cylinder body is provided with a guiding channel, and guiding bosses are arranged above and below the shielding cylinder body.
Furthermore, the supporting device comprises a supporting frame and a supporting horseshoe.
Further, the source detection device comprises a source shaking device, a shielding body and a shielding tank, wherein: the source shaking device comprises a stranded wire disc, a stranded wire disc handle and a stranded wire disc fixing support; the shielding body covers the upper end of the shielding tank, a lifting handle is arranged on the shielding body, and the stranded wire disc is fixed on the shielding body through a stranded wire disc fixing support; a neutron source channel and a neutron source baffle are arranged inside the shielding can, a push-pull handle is arranged on the neutron source baffle, and the push-pull handle can control the push-pull of the neutron source baffle.
Furthermore, the bottom of the shielding tank is provided with a guide groove which is matched and connected with a guide boss above the shielding cylinder body.
Furthermore, the neutron source comprises a neutron radioactive source, a neutron source cladding and a neutron source counterweight, and the neutron source cladding wraps and covers the outside of the neutron radioactive source and is connected with the stranded wire disc through a steel wire rope.
The neutron detector with the calibration function provided by the invention has the following beneficial effects:
the neutron detector with the calibration function provided by the invention adopts a double-layer shielding structure, the signal ground and the shell ground of a matched cable and a signal processing device are ensured to be separated, the anti-interference capability is strong, the electromagnetic shielding performance of a system is enhanced, a source detection device adopts a hand-cranking mode to lead in and lead out a radioactive source, and a shielding body and a shielding tank are arranged at the same time, so that the safety risk of a direct radioactive source of personnel is avoided, the radiation damage to operators in the process of leading in and leading out the radioactive source is reduced, in addition, a guide groove and a guide boss are arranged for quick alignment calibration, the calibration operability of the neutron detector in the use process is ensured, and the neutron source can vertically move in a channel.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a neutron detector with calibration capability according to the present invention;
FIG. 2 is a schematic structural diagram of a detection device and a preamplifier of a neutron detector with calibration function according to the invention;
FIG. 3 is a schematic structural diagram of a source detection device of a neutron detector with calibration function according to the present invention;
FIG. 4 is a side view of a source detection device of a neutron detector with calibration functionality according to the present invention;
FIG. 5 is a schematic view of the interior of a shielding can of a neutron detector with calibration functionality according to the present invention;
FIG. 6 is a schematic view of a neutron source of the neutron detector with calibration functionality of the present invention;
FIG. 7 is a schematic view of a source-detector base of a neutron detector with calibration functionality of the present invention;
in the figure: 1-detection device, 11-detector installation shaft, 12-neutron detector shell, 13-neutron detector core, 2-double shielding cable, 21-cable protection corrugated pipe, 3-neutron source, 31-neutron radioactive source, 32-neutron source cladding, 33-neutron source counterweight, 4-preamplifier, 41-preamplifier circuit, 42-preamplifier shell, 5-installation plate, 6-source detection base, 61-fixing seat, 62-shielding cylinder, 621-guide boss, 631-support frame, 632-support horse palm, 7-source detection device, 71-source shaking device, 711-twisted wire disc, 712-twisted wire disc handle, 713-twisted wire disc fixing support, 72-shielding body, 73-shielding pot, 731-neutron source channel, 732-neutron source baffle, 733-push-pull handle, 734-guide groove, 74-pull handle, 8-signal ground and 9-shell ground.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 7, an embodiment of the present invention provides a neutron detector with a calibration function, which includes a detection apparatus 1, a double-shielded cable 2, a neutron source 3, a preamplifier 4, a mounting plate 5, a source detection base 6, and a source detection apparatus 7, wherein: the detection device 1 is connected with a preamplifier 4 through a double-shielded cable 2; the preamplifier 4 is fixed below the mounting plate 5; the source detection base 6 is fixed above the mounting plate 5, the source detection device 7 is fixed above the source detection base 6, and the neutron source 3 is arranged inside the source detection device 7; the source 3 inside the source inspecting apparatus 7 can move vertically up and down.
Specifically, the neutron detector with the calibration function provided by the embodiment of the invention is mainly used for the nuclear power plant site 10 -1 nv～10 4 nv(1nv＝n·cm -2 ·s -1 ) The detection measurement of neutron environment in neutron fluence rate range is detected from falling neutron source 3 in the middle of source detection base 6 through detection device 1 that sets up in both sides, detects 3 radiation doses of neutron source to judge that neutron source 3 has radiation leakage, examine device 7 and source in addition and examine base 6 through the source and realize neutron detector's calibration jointly, lead in under the shielding of neutron source 3 under the non-calibration state and the calibration state and derive. The detection device 1 is mainly used for detecting the radiation dose parameters of the neutron source 3, the double-shielded cable 2 is mainly used for transmitting neutron signals, the preamplifier 4 is mainly used for converting and amplifying the neutron signals, and the preamplifier can be connected with a data processing terminal subsequently to analyze and process the amplified neutron signals. The mounting plate 5 mainly plays a role of fixing and supporting, the source detection base 6 is mainly used for supporting the source detection device 7 to ensure that the neutron source 3 can be accurately guided into the neutron source channel 731, and the source detection device 7 is mainly used for shielding the stored neutron source 3 and controlling the movement of the neutron source 3.
Further, the detection device 1 includes a neutron detector installation shaft 11, a neutron detector shell 12 and a neutron detector core 13. The neutron detector core 13 is externally wrapped with a neutron detector shell 12, the signal ground 8 is connected with the neutron detector core 13, the shell ground 9 is connected with the neutron detector shell 12, the signal ground 8 and the shell ground 9 are arranged in a separated mode, electromagnetic shielding performance is greatly enhanced, the neutron detector core is not easily influenced by the surrounding electromagnetic environment, and the radiation dose of the neutron source 3 can be accurately measured.
Further, a cable protection corrugated tube 21 is disposed outside the double shielded cable 2. The cable protection corrugated pipe 21 is mainly used for protecting a cable, preventing short-circuit accidents caused by disconnection of the cable, and simultaneously playing a certain role in isolating interference of an electromagnetic field.
Further, the preamplifier 4 includes a preamplifier circuit 41 and a preamplifier housing 42. The preamplifier circuit 41 is mainly used for amplifying the neutron signal, and may be subsequently connected to a signal processing terminal, and is used for analyzing and processing the amplified neutron signal, thereby determining whether the neutron source 3 has radiation leakage.
Further, the source detection base 6 includes a fixing base 61, a shielding cylinder 62 and a supporting device. Fixing base 61 mainly used fixed source is examined device 7, and strutting arrangement sets up between fixing base 61 and mounting panel 5, and shielding barrel 62 sets up under fixing base 61.
Further, a guide passage is provided inside the shield cylinder 62, and guide bosses 621 are provided above and below the shield cylinder. The inside leading-in passageway that is provided with of shielding barrel 62, a transmission for neutron source 3, neutron source 3 can reciprocate in leading-in passageway, furthermore, the upper and lower both ends of leading-in passageway are provided with derive and leading-in through-hole, a leading-in and derivation for neutron source 3, the direction boss 621 that the upper and lower side set up is mainly used and is examined device 7 and mounting panel 5 cooperation with the source and be connected, can counterpoint fast, realize neutron source 3's calibration, off-centre passageway when preventing neutron source 3 from removing.
Further, the supporting device includes a supporting frame 631 and a supporting horseshoe 632. The upper end and the fixing base 61 of support frame 631 are connected, and the lower extreme is connected with mounting panel 5 through supporting horseshoe 632, and mainly used is fixed mounting panel 5 with fixing base 61 on, makes shielding barrel 62 remain stable constantly in the detection process, can the accurate counterpoint, guarantees the leading-in passageway of entering that neutron source 3 can be accurate.
Further, the source detecting device 7 includes a shaking source device 71, a shielding body 72 and a shielding can 73, wherein: the source shaking device 71 comprises a stranding disc 711, a stranding disc handle 712 and a stranding disc fixing support 713; the shielding body 72 covers the upper end of the shielding tank 73, a lifting handle 74 is arranged on the shielding body 72, and the stranded wire coil 711 is fixed on the shielding body 72 through a stranded wire coil fixing support 713; the inside of the shielding can 73 is provided with a neutron source channel 731 and a neutron source baffle 732, the neutron source baffle 732 is provided with a push-pull handle 733, and the push-pull of the neutron source baffle 732 can be controlled by the push-pull handle 733. In the embodiment of the invention, the neutron source 3 can be pulled to move in the neutron source channel 731 by rotating the cable drum handle 712 through the cable drum 711, and the neutron source 3 is guided in and out in a hand-cranking manner, so that the risk of the straight-surface neutron radioactive source 31 of an operator is avoided, and the radiation damage of the neutron radioactive source 31 to the operator is reduced. The shielding body 72 and the shielding tank 73 are mainly arranged to enhance the anti-interference capability, prevent the influence of the electromagnetic environment, and prevent the radiation leakage of the neutron source 3, and the pulling handle 74 is arranged on the shielding body 72, so as to facilitate the movement of the source detection device 7. The neutron source baffle 732 can shield the neutron source channel 731, the movement of the neutron source baffle 732 can be controlled by pushing and pulling the handle 733, the neutron source 3 in a non-calibration state is shielded and shielded, and the neutron source 3 in a calibration state is conducted.
Further, the bottom of the shielding can 73 is provided with a guiding groove 734, which is in fit connection with the guiding boss 621 above the shielding cylinder 62. The bottom of the shielding can 73 is provided with a guiding groove 734, which is mainly used for matching and connecting with the shielding cylinder 62, and fast aligning and calibrating, so that the neutron source 3 can vertically and fast enter the neutron source channel 731 in the shielding can 73 from the guiding channel in the shielding cylinder 62.
Further, the neutron source 3 comprises a neutron source 31, a neutron source cladding 32 and a neutron source counterweight 33, wherein the neutron source cladding 32 wraps and covers the outside of the neutron source 31 and is connected with the stranded wire disc 711 through a steel wire rope. The neutron source containment shell 32 is mainly used to ensure that the radioactive source 31 is firmly mounted in the shell and does not loosen, and to ensure that the source core of the radioactive source 31 does not leak. The neutron source counterweight 33 mainly ensures that the neutron source 3 can vertically enter and exit in the channel through the action of gravity in the lowering process and cannot shift.
In the neutron detector with the calibration function provided by the embodiment of the invention, when the neutron source 3 needs to be used, the source detection base 6 is arranged above the mounting plate 5, the guide groove 734 below the shielding cylinder 62 can be quickly aligned to the calibration source pore passage of the mounting plate 5, then the source detection device 7 is arranged above the source detection base 6, the neutron source baffle 732 is pulled open by pushing and pulling the handle 733, then the stranded wire disc handle 712 is slowly shaken to descend the neutron source 3 at a constant speed, when the steel wire rope of the neutron source 3 is fully released, the centers of the neutron source 3 and the sensitive region of the detection device 1 are basically positioned at the same horizontal height, the detection device 1 measures the radiation dose of the neutron source 3, and whether the neutron source 3 has the rate radiation leakage is judged. After the measurement is finished, the steel wire rope of the neutron source 3 is retracted by shaking the wire twisting disc handle 712, the neutron source 3 returns to the shielding tank 73 of the source detection device 7, the push-pull handle 733 is pushed, the neutron source baffle 732 blocks the neutron source channel 731, and the shielding tank 73 is internally provided with a high-density polyethylene shielding body which can completely shield the emission of neutron rays in a shielding state.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (5)
1. A neutron detector with calibration function, characterized in that, include detection device, double-shielded cable, neutron source, preamplifier, mounting panel, source examine base and source examine the device, wherein:
the detection device is connected with the preamplifier through the double-shielded cable;
the preamplifier is fixed below the mounting plate;
the source detection base is fixed above the mounting plate;
the source detection device is fixed above the source detection base, and the neutron source is arranged in the source detection device;
the neutron source in the source detection device can vertically move up and down;
the detection device comprises a neutron detector installation vertical shaft, a neutron detector shell and a neutron detector core body;
a cable protection corrugated pipe is arranged outside the double-shielded cable;
the source detection base comprises a fixed seat, a shielding cylinder and a supporting device;
a guide channel is arranged in the shielding cylinder, and guide bosses are arranged above and below the shielding cylinder;
the source detection device comprises a source shaking device, a shielding body and a shielding tank, wherein: the source shaking device comprises a stranded wire disc, a stranded wire disc handle and a stranded wire disc fixing support;
the shielding body covers the upper end of the shielding tank, a lifting handle is arranged on the shielding body, and the wire coil is fixed on the shielding body through the wire coil fixing bracket;
the neutron source shielding device is characterized in that a neutron source channel and a neutron source baffle are arranged in the shielding can, a push-pull handle is arranged on the neutron source baffle, and the push-pull handle can control the push-pull of the neutron source baffle.
2. The neutron detector with calibration function of claim 1, wherein the preamplifier includes a preamplifier circuit and a preamplifier housing.
3. The neutron detector with calibration function of claim 1, wherein the support device comprises a support frame and a support horseshoe.
4. The neutron detector with the calibration function of claim 1, wherein a guide groove is formed in the bottom of the shielding can and is in fit connection with a guide boss above the shielding cylinder.
5. The neutron detector with calibration function of claim 1, wherein the neutron source comprises a neutron radiation source, a neutron source cladding and a neutron source counterweight, and the neutron source cladding is wrapped and covered outside the neutron radiation source and is connected with the stranded wire disc through a steel wire rope.
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| CN202011542148.XA CN112764088B (en) | 2020-12-22 | 2020-12-22 | Neutron detector with calibration function |
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| CN202011542148.XA CN112764088B (en) | 2020-12-22 | 2020-12-22 | Neutron detector with calibration function |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000235080A (en) * | 1999-02-16 | 2000-08-29 | Aloka Co Ltd | Calibrating device and method for neutron detector |
| US6754586B1 (en) * | 2003-03-28 | 2004-06-22 | Schlumberger Technology Corporation | Apparatus and methods for monitoring output from pulsed neutron sources |
| JP2016200422A (en) * | 2015-04-07 | 2016-12-01 | 株式会社東芝 | Apparatus and method for measuring neutron source distribution |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09236670A (en) * | 1996-02-29 | 1997-09-09 | Toshiba Eng Co Ltd | Calibrating equipment for neutron measuring apparatus |
| CN201955473U (en) * | 2010-12-16 | 2011-08-31 | 中国核动力研究设计院 | Multi-source gamma calibration device |
| CN103135119A (en) * | 2011-12-01 | 2013-06-05 | 中国辐射防护研究院 | Portable multi-range reference radiation device |
| US9213109B2 (en) * | 2012-05-24 | 2015-12-15 | Mitsubishi Electric Corporation | Radiation measurement device |
| CN104570049A (en) * | 2014-12-18 | 2015-04-29 | 中国船舶重工集团公司第七一九研究所 | Calibration tool for radiation detector |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000235080A (en) * | 1999-02-16 | 2000-08-29 | Aloka Co Ltd | Calibrating device and method for neutron detector |
| US6754586B1 (en) * | 2003-03-28 | 2004-06-22 | Schlumberger Technology Corporation | Apparatus and methods for monitoring output from pulsed neutron sources |
| JP2016200422A (en) * | 2015-04-07 | 2016-12-01 | 株式会社東芝 | Apparatus and method for measuring neutron source distribution |
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