CN201903513U - Gamma ray detection device special for close-range protection pipeline - Google Patents
Gamma ray detection device special for close-range protection pipeline Download PDFInfo
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- CN201903513U CN201903513U CN2010206793254U CN201020679325U CN201903513U CN 201903513 U CN201903513 U CN 201903513U CN 2010206793254 U CN2010206793254 U CN 2010206793254U CN 201020679325 U CN201020679325 U CN 201020679325U CN 201903513 U CN201903513 U CN 201903513U
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Abstract
The utility model introduces a gamma ray detection device special for a close-range protection pipeline, which comprises a source machine, a gamma ray source, a patch device and lead rubber, wherein the source machine comprises a gamma ray source storage room, a locking device, a gamma ray source channel, a pull rod and an internal exposure window, wherein the gamma ray source is mounted on the pull rod; the gamma ray source is positioned in the gamma ray source storage room in an off-working state; the gamma ray source channel is arranged at the middle part of the source machine; the internal exposure window is arranged at the middle bottom part of the gamma ray source channel; the patch device is a circular arc-shaped metal casing, a thin lead plate is arranged in the patch device in a lining manner, and a rectangular window capable of moving is formed in the middle. Due to the adoption of the gamma ray detection device, the detection work and the safe construction can be synchronously carried out, and the weatherproof detection also can be carried out; and the gamma ray detection device effectively reduces the radiation dose received by detection personnel, has unique advantages when used for detection in the upper air and in a narrow area, and needs not to take any special measures when used for detection at a special section and in a densely-populated area, thereby saving the trouble, the labor and a large amount of of expenditures.
Description
Technical field
This patent relates to a kind of Dynamic Non-Destruction Measurement, the special-purpose gamma-rays pick-up unit of particularly a kind of pipeline of closely protection.
Background technology
Ray detection is one of most important lossless detection method, because it is a recording medium with the transillumination egative film, clear picture, directly perceived, the storage life limit for length of well arranged, defect picture, the detection sensitivity height, so be fit to detect the workpiece of various unlike materials and thickness, thereby ray detection is widely used in the process of check welding quality.But ray is harmful to health, need take effective safeguard procedures.And it is impossible to make that based on this reason ray detection and the operation simultaneously of other work post become.In building, be that there are long-term unsurmountable sharp contradiction in ray detection and installation in the construction and maintenance process by fields such as, chemical industry, seriously restricting the links such as duration, quality, safety of project construction.
It is one of important lossless detection method that gamma-rays detects, because its transillumination scope is big, and the radiographic film clear picture, well arranged, the defective image is directly perceived, and the pot-life is permanent, thereby is widely adopted in the process of check welding quality.
The structure of industrial common gamma-ray detection apparatus generally comprises compositions such as source machine, radioactive source, source channels, radioactive source storage silo, operating mechanism and defeated source capsule, operating mechanism can comprise crank, drive the cable composition, the γ source is stored in the machine of source at ordinary times, when carrying out the detection of gamma-rays panoramic exposure, operating mechanism operation radioactive source from the radioactive source storage silo along source channels and the defeated pipe in source move to exposure position, be in the panoramic exposure state this moment, the equipment that ray is detected by needs carries out the egative film exposure, obtains the testing result of equipment.And common gamma-ray detection apparatus itself does not have the exposure window, and usually only the reservoir vessel as the γ source exists.
Gamma ray projector commonly used mainly contains Ir-192, Co-60 and Se-75 in the industrial radiography at present.In the time of in gamma ray projector is stored in main frame, owing to the shielding action of main frame to x radiation x, the x radiation x dosage outside main frame meets the relevant national standard regulation.And when the source is in detected state, basically do not have in the course of conveying from the main frame to the collimating apparatus of shielding action and source without any protective shielding, want x radiation x dosage to meet the relevant national standard regulation, gamma-rays job safety control area just needs very big, particularly Ir-192 and Co-60 gamma ray projector Safety Area radius can far reach more than 100 meters, this makes noon or night when gamma-rays detection operation is arranged in other site works personnel rest usually carry out, and this is to the duration of a project, quality assurance, personal security, the ageing grade of testing result all has a negative impact.
Thereby research and develop a kind of novelly, and can construct synchronously with other work post, it is very urgent and necessary that round-the-clock, safe, efficient, easy to operate ray detection system just seems.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of special-purpose gamma-rays pick-up unit of pipeline of closely protection, thus can with the installation synchronization job, finish ray detection.
For the purpose that realizes solving the problems of the technologies described above, the utility model has adopted following technical scheme:
The special-purpose gamma-rays pick-up unit of the pipeline of a kind of closely protection of the present utility model, comprise source machine, gamma ray projector, paster device, plumbous rubber, wherein the source machine comprises gamma ray projector storeroom, locking device, gamma ray projector passage, pull bar, inner exposure window composition, gamma ray projector is installed on the pull bar, gamma ray projector is positioned at the gamma ray projector storeroom during off working state, at the middle part of source machine the gamma ray projector passage is set, is provided with inner exposure window in the central bottom position of gamma ray projector passage; Locking device can be locked pull bar at diverse location; The paster device is that profile is one section circular arc metal shell, the liner rolled lead, the centre have can be movable the rectangle window, the rectangle window width is greater than the width 20 ~ 100mm of the pipe welding seam that will detect, and paster device arc radius is consistent with the pipeline radius that need detect or greater than pipeline radius 2 ~ 10mm; Plumbous rubber is used for being wrapped in the outside of pipeline and source machine, prevents the leakage of ray.Further concrete structure is: gamma ray projector is fixed on an end of pull bar by the stainless steel spheroid parcel of hollow by the stainless steel spheroid;
Further technical scheme can be: the special-purpose gamma-rays pick-up unit of the pipeline of a kind of closely protection of the present utility model also comprises driving mechanism, and driving mechanism comprises driver, driving cable, gamma ray projector stem pipe; Driver comprises driving-disc and crank, drives cable and is connected on the driving-disc.Driving mechanism uses during in source machine operate outside at the needs gamma ray projector, shake crank during work, driving-disc is driven drive cable, drive cable and link to each other with pull bar, move in gamma ray projector stem pipe thereby drive gamma ray projector, final arrival detected workpiece to the working position.
Further technical scheme can also be: the special-purpose gamma-rays pick-up unit of the pipeline of a kind of closely protection of the present utility model also comprises protective cover, and the profile of the shape of protective cover and source machine adapts, thereby the source machine is played a protective role.When using protective cover, the plumbous rubber that was wrapped in machine outside, source originally just directly is wrapped in the protective cover outside.
Further technical scheme can also be: described inner exposure window is a square cone exposure hole, the long angle of square cone exposure hole 30-45 degree, short angle 8-15 degree.
Further technical scheme can also be: described source machine adopts tungalloy to make.Tungalloy substitutes depleted nuclear fuel as shield, and when the source machine was not adorned the γ source, the main frame body did not produce any radiation, and when having avoided the use depleted nuclear fuel as source machine shielding material, the width of cloth of depleted nuclear fuel itself is penetrated and defective such as instability.
Further technical scheme can also be: the special-purpose gamma-rays pick-up unit of the pipeline of a kind of closely protection of the present utility model, and paster equipment matter is that stainless steel and lead composite material are made, wherein the outside is a stainless steel, the liner stereotype.Can shield the direct ray that the source machine sends like this, also can protect the transillumination film to avoid situations such as extruding.
Further technical scheme can also be: the special-purpose gamma-rays pick-up unit of the pipeline of a kind of closely protection of the present utility model is provided with inner exposure window exposure hole stopping device in the machine of source.
Further technical scheme can also be: the gamma ray projector that the special-purpose gamma-rays pick-up unit of the pipeline of a kind of closely protection of the present utility model adopts is Se75 γ source.Its average energy is 0.206MeV, is equivalent to the X ray of 200 kV, and the Se-75 gamma-rays is compared with the X ray of identical energy, and penetration power is bigger; The Se-75 γ source half life period length be 120 days, be 1.6 times of Ir-192 γ source; Se-75 γ source is compared with Ir-192, Co-60 γ source, and the egative film sensitivity of transillumination is higher, and tolerance is big.Therefore, Se-75 gamma ray projector optimum transillumination 10-the process pipe weld bond that the iron and steel parts of 40mm thickness, the particularly scope of operation are narrow and the small-bore weld bond of boiler heating surface.Simultaneously, it is lower that average energy is compared in Se-75 gamma ray projector and Ir-192 and Co-60 γ source, and it is easy that the security protection dosage control is penetrated the source than Ir-192 and Co-60 γ, also brings possibility for realizing that closely the ray width of cloth is penetrated protection.
Aforesaid any technical scheme, its metal parts comprise that the setting of the plumbous rubber thickness of parcel all should make the γ that leaks penetrate the source and be lower than state specified standards, to alleviate or to avoid injury to operating personnel.
The special-purpose gamma-rays pick-up unit of the pipeline of closely protection of the present utility model, its working method is: when needs carry out the detection task of pipe welding seam, the inside exposure window of source machine is aimed at the workpiece position that needs detection, pipe welding seam for example, wrap up plumbous rubber in the weld seam both sides, be positioned at the paster device then and need carry out pipe welding seam that pipe welding seam detects a side away from inside exposure window, weld seam is positioned at the gap centre position of paster device, outside the paster device, place the film that needs exposure, and then the plumbous rubber of parcel outside film and outside the machine of source; Mobile pull bar moves to inner exposure window with gamma ray projector, and gamma-rays exposes to film by weld seam, thereby can detect the quality of weld seam.
The source machine of this patent pick-up unit is in the gamma ray projector storeroom when inoperative, this moment is by source machine self-protection system shielding ray, by hand gamma ray projector is delivered to inner exposure window by pull bar and carried out the orientation exposure, this moment is comprehensive shielded by source machine, protective cover, paster device, plumbous rubber, thereby make the ray of pick-up unit under work obtain shielding, arrive the design application target of this pick-up unit.Remove the manual-operating mechanism of native system, drive cable in the defeated source capsule connection of gamma ray projector, by driving cable the γ source is delivered to the operate outside position, just exposure position is in the panoramic exposure shape at this moment, thereby has increased the use value of equipment greatly.
Guard system does not have omission with source machine safety and connects, protective cover is placed on machine top, source, the paster device is placed on position, machine ray window opposite, source, to treat transillumination film parcel wherein, plumbous rubber shielding protection layer is with the whole parcel of protective cover, paster device and weld seam to be checked, plumbous rubber is as the auxiliary safeguard procedures of replenishing, and the total system unification is fixed together.Each parameters of operating part of guard system comprises after plumbous rubber shielding protection layer thickness, paster device thickness are by the on-the-spot repetition test of Theoretical Calculation process to be determined.
The special-purpose gamma-rays pick-up unit of the pipeline pull bar of the closely protection of this patent be detachable, rod-pulling type pull bar, uses during as the totally-enclosed gamma-rays detection system transillumination that closely protects; When pull bar retracts outside the machine of source fully, make the source get back to gamma ray projector storeroom position; When pull bar advances when putting in place fully to source machine center position, gamma ray projector is transported to the working position, when inside exposure window is opened, carries out sensitivity of film; After detachable, rod-pulling type operating mechanism were removed, its functions of use was identical with conventional source machine.
Using for the special-purpose gamma-rays pick-up unit of the pipeline that closely protects that makes this patent also can be used as the logical gamma-rays pick-up unit of a Daepori simultaneously, is fixing and removable two parts with the gamma ray projector channels designs.When using in detection architecture closely, moveable part is installed in the machine of source; When using as common source machine, moveable part is taken out, source channels is got through, and machine two ends, source connect goes up driving cable and defeated source capsule, and radioactive source is transported to the outer appointment exposure position of source machine.
The special-purpose gamma-rays pick-up unit of pipeline of the closely protection of this patent improves on the basis of conventional γ source machine equipment and innovates, except that the function that possesses conventional γ source machine, also possess outside 3 meters ~ 5 meters scopes of equipment center, no matter which kind of attitude equipment adopts carry out sensitivity of film, and public institute acceptable dose all is lower than the specific function of GBZ132-2008 regulation (2.5uSv/h).
These technical schemes comprise that improved technical scheme and further improved technical scheme also can make up mutually or combination, thereby reach better technique effect.
By adopting technique scheme, the present invention has following beneficial effect:
The special-purpose gamma-rays pick-up unit of the pipeline of a kind of closely protection of the present utility model can make detection operation and installation synchronous, is greatly improved and can only detects the environment of construction night, can round-the-clockly detect, and reduces the potential safety hazard of detection at night; And can effectively reduce the actual radiation dose of accepting of testing staff, in the high-altitude, the detection in narrow and small zone has unique advantage; In special location, dense population areas detects and need not to take special measure, can save trouble, laborsaving, save a large amount of funds;
This gamma-rays pick-up unit is except that the function that possesses conventional γ source machine, also possess outside 3 meters ~ 5 meters scopes of equipment center, no matter which kind of attitude equipment adopts carry out sensitivity of film, and public institute acceptable dose all is lower than the specific function of GBZ132-2008 regulation (2.5uSv/h).
Adopt the special-purpose gamma-rays pick-up unit of pipeline of closely protection of the present utility model, but the construction on daytime, in light weight, simple in structure, need not water power, significantly improve and detect work efficiency, can effectively shorten the duration of a project; Aspects such as the expense of this system own, personnel's input, the raising that need not water power, equipment maintenance cost, detection work efficiency, reduction of erection time all are that other detection method is incomparable, have remarkable economic efficiency; The enforcement of this pick-up unit will be filled up the blank in domestic this field, be testing agency, testing staff's Gospel, can change the theory of traditional detection, and application prospect is extensive, not only can produce great economic benefit, also can bring good social benefit simultaneously.
Description of drawings
Fig. 1 is a kind of gamma-rays pick-up unit of prior art.
Fig. 2 is the special-purpose gamma-rays pick-up unit of the pipeline working state schematic representation of closely protection of the present utility model.
Fig. 3 is a source of the present utility model machine face synoptic diagram.
Fig. 4 is special-purpose gamma-rays pick-up unit source machine of the pipeline of closely protection of the present utility model and adjacent component synoptic diagram.
Fig. 5 is a radioactive ray Leak Detection position view.
Fig. 6 is a paster device structural representation.
Fig. 7 is the special-purpose gamma-rays pick-up unit of the pipeline scheme of installation of closely protection of the present utility model.
Fig. 8 is that synoptic diagram is looked on the right side of Fig. 7.
Among the figure, 1. source machine, 2. locking device, 3. gamma ray projector passage, 4. gamma ray projector storeroom, 5. driving-disc, 6. driving cable, 7. crank, 8. gamma ray projector stem pipe, 9. the detection position of gamma ray projector outside main frame, 11. radioactive sources, 12. protective covers, 13. inner exposure window, 14. groups of pipelines that will detect, 15. paster devices, 16. directly effective transillumination zone, 17. plumbous preventing rubber layers, working position, 21. source, 22. driving mechanism, 23. pipelines, 24. weld seams, 25. the test radius, 31. source machine handles, 32. radiation-resistant glass bodies, 33. working position, source, 35. source machine key, 36. connect driving cable joint, 37. source plaits, 40. scalable is carved piece, 41. the anti-scatter block, 42. footing, 43. connect defeated source capsule joint.
101 ~ 108 is the test point position.
Embodiment
Below in conjunction with embodiment this patent is described further.
As Fig. 2 ~ shown in Figure 7, the special-purpose gamma-rays pick-up unit of the pipeline of a kind of closely protection of the present utility model, comprise source machine 1, gamma ray projector, paster device 15, plumbous rubber, driving mechanism 22, protective cover 12 compositions, wherein source machine 1 comprises gamma ray projector storeroom 4, locking device 2, gamma ray projector passage 3, pull bar, inner exposure window 13, gamma ray projector 11 is installed on the pull bar, gamma ray projector passage 3 is provided with at the middle part of source machine 1, at the inside exposure window 13 of the side of being provided with, central bottom position of gamma ray projector passage 3 cone exposure hole shape; Gamma ray projector 11 is fixed on an end of pull bar; The gap width of paster device 15 is greater than the width 8mm of the pipe welding seam that will detect, and paster device 15 radiuses are greater than pipeline radius 5mm; Machine 1 outside in source also is provided with protective cover 12; Driving mechanism 22 comprises driver, driving cable 6, gamma ray projector stem pipe 8 compositions; Driver comprises driving-disc 5 and crank 7, drives cable 6 and is connected on the driving-disc 5.The long angle of the square cone exposure hole of inner exposure window 13 39 degree, short angle 12 degree.
The profile of paster device is one section circular arc stainless steel casing, the liner rolled lead, the centre have can be movable the rectangle window, circular arc inner opening width is greater than the width 20 ~ 100mm of the pipe welding seam that will detect, and paster device arc radius is consistent with the pipeline radius that need detect or greater than pipeline radius 2 ~ 10mm.
When needs carry out the detection task of pipe welding seam, inside exposure window 13 align with tube weld seams with source machine 1, wrap up plumbous rubber in the weld seam both sides, be positioned at paster device 15 then and need carry out pipe welding seam that pipe welding seam detects a side away from inside exposure window 13, weld seam is positioned at the gap centre position of paster device 15, place the film that needs exposure in paster device 15 outsides, and then the plumbous rubber of parcel outside film and outside the protective cover of source machine 1; Mobile pull bar moves to inner exposure window 13 with gamma ray projector 11, and gamma-rays exposes to film by weld seam, thereby can detect the quality of weld seam.Driving mechanism 22 uses during in source machine 1 operate outside at the needs gamma ray projector, shake crank 7 during work, driving-disc 5 is driven drive cable 6, drive cable 6 and link to each other with pull bar, move in gamma ray projector stem pipe 8 thereby drive gamma ray projector, final arrival detected workpiece to the working position.
Protection level during native system work adopts following method test.A kind of situation is that the source machine 1 of source strength 80Ci is the pipe welding seam top of φ 426 * 17mm in specification, and the ray window is over against the below; Another kind of situation is that source machine 1 is placed in the pipeline side, and the ray window is over against horizontal direction.Each direction is tested 8 points.Test 8 points by above-mentioned two mutually perpendicular discs, every direction, can represent the radiation event of whole sphere x radiation x field substantially.The concrete location drawing as shown in Figure 4.
Two kinds of situation test results such as following table:
| Sequence number | The test radius | Each test point end value (Sv/h) | ? | ? | ? | ? | ? | ? | ? |
| ? | ? | 101 | 102 | 103 | 104 | 405 | 106 | 107 | 108 |
| 1 | 2m | 2.0 | 2.4 | 2.4 | 2.3 | 2.3 | 2.2 | 1.7 | 2.3 |
| 2 | 3m | 1.1 | 1.3 | 1.1 | 1.9 | 1.1 | 1.2 | 1.1 | 1.8 |
When the result of sequence number 1 was source strength 80Ci, the source machine was the pipe welding seam top of φ 426 * 17mm in specification, and the ray window is over against the below; The source machine was the pipe welding seam side of φ 426 * 17mm in specification when the result of sequence number 1 was source strength 80Ci, and the ray window is over against horizontal direction.The leakage value that the result shows meets national standard.
By repeatedly to the test of body series, the result shows: the special-purpose gamma-rays pick-up unit of the pipeline transillumination negative quality of a kind of closely protection of the present utility model is good, radiation dose is less than 2.5 μ Sv/h within 3 meters ~ 5 meters scopes of radius behind the shielding protection, and two important indicators reach request for utilization.
Claims (10)
1. special-purpose gamma-rays pick-up unit of pipeline of protection closely, it is characterized in that: pick-up unit comprises source machine, gamma ray projector, paster device, plumbous rubber, wherein the source machine comprises gamma ray projector storeroom, locking device, gamma ray projector passage, pull bar, inner exposure window composition, gamma ray projector is installed on the pull bar, gamma ray projector is positioned at the gamma ray projector storeroom during off working state, at the middle part of source machine the gamma ray projector passage is set, is provided with inner exposure window in the central bottom position of gamma ray projector passage; Gamma ray projector is fixed on an end of pull bar by the stainless steel spheroid parcel of hollow by the stainless steel spheroid; Locking device can be locked pull bar at diverse location; The paster device is that profile is one section circular arc stainless steel casing, the liner rolled lead, the centre have can be movable the rectangle window, the rectangle window width is greater than the width 20 ~ 100mm of the pipe welding seam that will detect, and paster device arc radius is consistent with the pipeline radius that need detect or greater than pipeline radius 2 ~ 10mm; Plumbous rubber is used for being wrapped in the outside of pipeline and source machine, prevents the leakage of ray.
2. according to the special-purpose gamma-rays pick-up unit of pipeline of the described closely protection of claim 1, it is characterized in that: described pick-up unit comprises driving mechanism, and driving mechanism comprises driver, driving cable, gamma ray projector stem pipe; Driver comprises driving-disc and crank, drives cable and is connected on the driving-disc.
3. according to the special-purpose gamma-rays pick-up unit of pipeline of the described closely protection of claim 1, it is characterized in that: described pick-up unit comprises protective cover, and the profile of the shape of protective cover and source machine adapts, and the source machine is played a protective role.
4. according to the special-purpose gamma-rays pick-up unit of pipeline of the described closely protection of claim 1, it is characterized in that: described inner exposure window is a square cone exposure hole, the long angle of square cone exposure hole 30-45 degree, short angle 8-15 degree.
5. according to the special-purpose gamma-rays pick-up unit of pipeline of the described closely protection of claim 1, it is characterized in that: described source machine adopts tungalloy to make.
6. according to the special-purpose gamma-rays pick-up unit of pipeline of the described closely protection of claim 1, it is characterized in that: described paster equipment matter is that stainless steel and lead composite material are made, and wherein the outside is a stainless steel, the liner stereotype.
7. according to the special-purpose gamma-rays pick-up unit of pipeline of the described closely protection of claim 1, it is characterized in that: inner exposure window exposure hole stopping device is set in the machine of described source.
8. according to the special-purpose gamma-rays pick-up unit of pipeline of the described closely protection of claim 1, it is characterized in that: the gamma ray projector that described pick-up unit adopts is Se75 γ source.
9. according to the special-purpose gamma-rays pick-up unit of pipeline of the described closely protection of claim 1, it is characterized in that: described pull bar is detachable, rod-pulling type pull bar, uses during as the totally-enclosed gamma-rays detection system transillumination of protection closely; When pull bar retracts outside the machine of source fully, make the source get back to gamma ray projector storeroom position; When pull bar advances when putting in place fully to source machine center position, gamma ray projector is transported to the working position, when inside exposure window is opened, carries out sensitivity of film; After detachable, rod-pulling type operating mechanism were removed, its functions of use was identical with conventional source machine.
10. according to the special-purpose gamma-rays pick-up unit of pipeline of the described closely protection of claim 1, it is characterized in that: described gamma ray projector passage is fixing and removable two parts; When using in detection architecture closely, moveable part is installed in the machine of source; When using as common source machine, moveable part is taken out, source channels is got through, and machine two ends, source connect goes up driving cable and defeated source capsule, and radioactive source is transported to the outer appointment exposure position of source machine.
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| CN2010206793254U CN201903513U (en) | 2010-12-24 | 2010-12-24 | Gamma ray detection device special for close-range protection pipeline |
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| CN2010206793254U CN201903513U (en) | 2010-12-24 | 2010-12-24 | Gamma ray detection device special for close-range protection pipeline |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095739A (en) * | 2010-12-24 | 2011-06-15 | 中国石油天然气第一建设公司 | Gamma ray detector specially for close range protective pipeline |
| CN102749340A (en) * | 2012-06-07 | 2012-10-24 | 中国石油天然气第一建设公司 | Adjustable pipe center transillumination device |
| CN102759537A (en) * | 2012-07-17 | 2012-10-31 | 中广核检测技术有限公司 | Radiographic testing method for welding beams under radioactive environment of nuclear power station |
| CN104833683A (en) * | 2015-05-13 | 2015-08-12 | 广东华泰检测科技有限公司 | Novel gamma ray detection device |
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2010
- 2010-12-24 CN CN2010206793254U patent/CN201903513U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095739A (en) * | 2010-12-24 | 2011-06-15 | 中国石油天然气第一建设公司 | Gamma ray detector specially for close range protective pipeline |
| CN102095739B (en) * | 2010-12-24 | 2013-01-02 | 中国石油天然气第一建设公司 | Gamma ray detector specially for close range protective pipeline |
| CN102749340A (en) * | 2012-06-07 | 2012-10-24 | 中国石油天然气第一建设公司 | Adjustable pipe center transillumination device |
| CN102749340B (en) * | 2012-06-07 | 2014-08-06 | 中国石油天然气第一建设公司 | Adjustable pipe center transillumination device |
| CN102759537A (en) * | 2012-07-17 | 2012-10-31 | 中广核检测技术有限公司 | Radiographic testing method for welding beams under radioactive environment of nuclear power station |
| CN104833683A (en) * | 2015-05-13 | 2015-08-12 | 广东华泰检测科技有限公司 | Novel gamma ray detection device |
| CN104833683B (en) * | 2015-05-13 | 2018-07-10 | 广东华泰检测科技有限公司 | A kind of gamma-ray testing apparatus |
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