CN2285905Y - Middle- and high-energy X- and gamma-radiation imaging array ionisation chamber measuring apparatus - Google Patents
Middle- and high-energy X- and gamma-radiation imaging array ionisation chamber measuring apparatus Download PDFInfo
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- CN2285905Y CN2285905Y CN 97200610 CN97200610U CN2285905Y CN 2285905 Y CN2285905 Y CN 2285905Y CN 97200610 CN97200610 CN 97200610 CN 97200610 U CN97200610 U CN 97200610U CN 2285905 Y CN2285905 Y CN 2285905Y
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- ionization chamber
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Abstract
The utility model relates to a middle-energy and high-energy X-radiation and gamma-radiation imaging array ionization chamber measuring apparatus, belonging to the field of application of nuclear technology. The utility model is composed of a plurality of array ionization chamber units which are arranged on a support frame. Each array ionization chamber unit is composed of a grid-shaped voltage withstanding sealed casing and each electrode system which is arranged in each chamber of the casing. In the grid-shaped voltage withstanding sealed casing of the same array ionization chamber unit, each electrode system which is divided by a grid separator plate is arrayed in a fan shape; the central axis of each electrode system aims at a radiation source. When an electrode sheet in each electrode system are parallel with each other, the field angle of the electrode sheet and the radiation source is not more than 2 DEG. The field angle of the sensitive region of each array ionization chamber unit and the radiation source is the sum of the field angle of each electrode system and the radiation source, which is significantly larger than 2 DEG.
Description
The utility model relates to a kind of middle and high-energy χ, gamma-radiation imaging detector array for ionization chamber, belongs to the Application of Nuclear Technology field.
Chinese patent 93102728.4 discloses a kind of gas-ionization high energy χ, gamma-radiation imaging array detecting device.This device is made up of a plurality of high-pressure ionization chamber array units that are installed on the support.Each ionization chamber unit comprises pressure-resistant seal housing, electrode system and charges into wherein gases at high pressure.Less than 2 °, wherein each electrode of electrode system is to be parallel to the χ that injects in this ionization chamber unit, the average direct of travel of γ photon to radiogenic subtended angle in each ionization chamber unit.The sniffer that is formed by each array for ionization chamber unit combination shines the open country to the ray that radiogenic total subtended angle limited, and should be able to contain tested object fully.
This sniffer dynamic range of signals is big, detection efficiency and highly sensitive, and reliability and radioresistance are good, and mission life is extremely long, can satisfy every requirement of large object χ such as container, gamma-radiation imaging detection system.But also there is certain limitation in it.
The main limitation of this kind array detecting device is that its each array for ionization chamber unit all is no more than 2 ° to radiogenic subtended angle.This makes that when realizing the irradiation field of tens of degree subtended angles the number of the array for ionization chamber unit of composition sniffer is quite a lot of.Particularly when using gamma activity isotope radiation source, sniffer and radiogenic distance are near, and the subtended angle of used irradiation field can be greatly to more than 60 °, and the number of then required array for ionization chamber unit will be more.This has just enlarged markedly workload and cost that sniffer is made, simultaneously, has also increased installation, the difficulty when adjusting.
The purpose of this utility model is to carry out some important improvement on the basis of said apparatus, enable obviously to enlarge the scale of each array for ionization chamber unit in the sniffer and to radiogenic subtended angle, thereby significantly reduce the array for ionization chamber number of unit of forming sniffer, to reduce manufacturing cost and to simplify adjustment, installment work.
The utility model is made up of a plurality of array for ionization chamber unit that is installed on the support.The array for ionization chamber unit is made of lattice-shaped pressure-resistant seal housing and a plurality of electrode system.The lattice-shaped housing is a hermetically-sealed construction, front end is χ, gamma-rays entrance window, be welded with metal-ceramic sealing by fusing insulator as the contact conductor end and exhaust, gas-filled tube on the end plate, there is some being welded between the left and right side plate its inside, be and aim at radiogenic entad arrangement mode grid dividing plate, separated by spaces in the shell is become some chambers.In each chamber of lattice-shaped seal casinghousing, the electrode system of settling each to form respectively by strip collector and high-pressure stage.Each electrode system that is separated by the grid dividing plate in same seal casinghousing makes each autoregistration radiographic source of its central axis by fan-shaped array.When the whole electrodes in the electrode system when being parallel to each other, each electrode system all is no more than 2 ° to radiogenic subtended angle.The array for ionization chamber unit is incited somebody to action 〉=2 ° by the sensitive volume that each electrode system is combined into to radiogenic subtended angle, can reach 4 °, 8 ° or bigger, obviously enlarged the scale of array for ionization chamber unit, form the required array for ionization chamber unit number of whole sniffer thereby will reduce, even whole sniffer is made up of an array for ionization chamber unit.
Advantage of the present utility model: reduce the number of the required array for ionization chamber unit of ionization chamber sniffer, simplified the operation of adjustment, installation, greatly reduce cost.
Illustrate that accompanying drawing is as follows:
Fig. 1 is an array for ionization chamber cellular construction synoptic diagram of the present utility model.
Fig. 2 is the structural representation of lattice-shaped seal casinghousing.
Fig. 3 is the grid dividing plate in the lattice-shaped seal casinghousing and the welding line structure synoptic diagram of left side plate.
Fig. 4 is that adjacent two array Shens of the present utility model cooperate the situation of installing from chamber unit.
Fig. 5 with the utility model be applied to
60Co is the embodiment in the container examination system of gamma ray projector.
Introduce content of the present utility model in detail below in conjunction with accompanying drawing.
1 and 5 is upper and lower side plates of array for ionization chamber unit seal casinghousing among Fig. 1; 3 and 6 is left and right side plates of housing; The 2nd, be welded on the grid dividing plate between left and right side plate (3,6), the 4th, the χ of seal casinghousing, gamma-rays entrance window; The 7th, the electrode system that constitutes by the strip electrode; The 8th, the end plate of seal casinghousing is welded with exhaust, gas-filled tube 9 and a plurality of metal-ceramic sealing by fusing insulator 10 on it.11 is radiographic source and preceding collimating apparatus among Fig. 5; The 12nd, tested object (as container); The 13rd, back collimating apparatus; The 14th, the utility model.
As shown in Figure 1, the array for ionization chamber unit that comprised of middle and high-energy χ of the present utility model, gamma-radiation imaging sniffer is made of lattice-shaped seal casinghousing and a plurality of electrode system 7.
The lattice-shaped seal casinghousing is by upper and lower side plate 1,5 as shown in Figure 1 and Figure 2, left and right side plate 3,6, χ, gamma-rays entrance window 4, end plate 8 and exhaust, gas-filled tube 9 are welded, have good air-tightness and (always leak less than 1 * 10 with metal-ceramic sealing by fusing insulator 10 usefulness argon arc welding methods
-7Pascal, liter/second) and compressive resistance can bear 1 * 10
7Pascal's air pressure).The grid dividing plate 2 that is welded on 3,6 of left and right side plates entad distributes by fan-shaped, all aims at radiographic source, and will be separated into some chambers in the seal casinghousing.Grid dividing plate 2 also can be the fence shape dividing plate that is made of a plurality of narrow sheet metals at regular intervals mutually or bar for being processed with the sheet metal of UNICOM's hole.Grid dividing plate 2 in seal casinghousing only bears drawing stress because the atmospheric pressure value of its both sides equates.Under inflation situation, the pressure that is added on the left and right side plate 3,6 is born with each grid dividing plate 2 jointly by upper and lower side plate 1,5.Therefore, under the prerequisite that guarantees the enough bearing resistances of seal casinghousing, the thickness of side plate 1,5 and grid dividing plate 2 can be little of making it produce " pixel size " that " detection dead band " all is significantly less than array for ionization chamber.
As shown in Figure 1, comprise a plurality of electrode systems 7 in the array for ionization chamber of the present utility model unit, be placed in respectively among each chamber that separates by grid dividing plate 2 in the seal casinghousing.Each electrode system 7 is formed by a plurality of strip metal electrodes that are contained on the electrode suppor.Metal electrode divides two kinds of collector and high-pressure stages, arranges interlacedly.Each collector and high-pressure stage on the other side constitute a pixel ionization chamber unit, thus electrode system to comprise the first number of pixel ionization chamber be exactly wherein collection number of poles.Incident χ, gamma-rays produces ionization in the interpolar gas of pixel ionization chamber unit, and produces the output signal of this pixel ionization chamber unit place place radiation intensity of reflection under the interpolar electric field action.Each collector is drawn output signal by each metal-ceramic sealing by fusing insulator 10 that is welded on the end plate 8 respectively.Each high-pressure stage is parallel with one another, add work voltage and also introduce by the in addition several metals-ceramic sealing by fusing insulator that is welded on the end plate 8.
When whole electrodes of electrode system 7 when being parallel to each other, parallel direction be exactly to inject the average direct of travel of the χ of this electrode system, γ photon.At this moment, each electrode system all should be less than 2 ° to radiogenic subtended angle, and is excessive with the detection performance difference of avoiding each pixel ionization chamber unit.This is equally just to the requirement of each grid dividing plate distribution density in the seal casinghousing.Electrode system in each chamber of seal casinghousing is fan-shaped and entad distributes, and the central axis of each electrode system is all aimed at radiographic source.Thus, sensitive volume, array for ionization chamber unit to radiogenic subtended angle (being formed by stacking) by the subtended angle of each electrode system 7 wherein will be obviously 〉=2 °, but the difference of each pixel ionization chamber unit detection performance and little.
Make each electrode of electrode system 7 be fan-shaped if adopt complicated process technology and entad distribute, all aim at radiographic source, then 7 pairs of radiogenic subtended angles of electrode system can 〉=2 °.The distribution density of grid dividing plate is only by the compressive resistance decision of seal casinghousing in this moment array for ionization chamber unit seal casinghousing, the chamber that it separated to radiogenic subtended angle also with electrode system the same can 〉=2 °.Can reduce dividing plate 2 numbers in the seal casinghousing like this, but owing to reach several meters or when bigger when radiographic source and sniffer distance, realize that the fan-shaped entad distribution of each electrode is quite difficult in the electrode system, this will be directed at the obvious raising of cost.
As previously mentioned, the array for ionization chamber unit seal casinghousing of the utility model sniffer is an all-welded structure.Be proof strength, should adopt fusion welding method such as argon arc welding, EBW (electron beam welding) and use the method for welding of high strength such as money base, auri scolder to weld.Generally, dividing plate 2, side plate 1,5, entrance window 4 and 8 of end plates all adopt the argon arc welding.For avoiding welding deformation, grid dividing plate 2 is designed to as shown in Figure 3 with the welding line structure of 3,6 of side plates.Can not sealing weld material when carrying out argon arc welding, directly dividing plate 2 is welded together with the flange that processes on side plate 3 or 6.The welding current of this weldering method is little, is difficult for welding deformation takes place, and facts have proved feasible.
Different with grid dividing plate 2, upper and lower side plate 1,5 not only bears drawing stress, and bears sizable wall pressure owing to the air pressure of its both sides is different.Be the expansion deformation that reduces to cause because of wall pressure, on.It is enough big that the thickness of following side plate 1,5 is wanted.But this can be directed at " the detection dead band " of causing because of upper and lower side plate 1,5 thickness between two array for ionization chamber unit and become big.For this reason, will descend, down side plate design, be processed into a series of bar shaped zigzag projectioies are arranged on its outside surface.At this moment, the compressive resistance of upper and lower side plate depends mainly on the gross thickness of band saw tooth and protruding side plate 1,5.But when two array for ionization chamber unit were stacked, the zigzag projection of their adjacent upper and lower side plate staggered mutually.Therefore, as shown in Figure 4, " the detection dead band " of causing owing to upper and lower side plate between the two array for ionization chamber unit will obvious twice value less than side plate thickness.Adopt the upper and lower side plate shaped design of this kind, can under the condition that guarantees identical compressive resistance, dwindle " detection dead band " between the adjacent array ionization chamber unit.
As shown in Figure 5
60Use embodiment of the present utility model in the Co gamma-rays container examination system.The sniffer sensitive volume reaches 60 ° or bigger to radiogenic total subtended angle in this detection system.The pressure-resistant seal housing that designs each array for ionization chamber unit by the utility model is divided into four chambers by three grid dividing plates.An electrode system that comprises 16 pixel ionization chamber units is housed in each chamber, and wherein each electrode is parallel mutually, and it is about 1 ° to radiogenic subtended angle.Four electrode systems in each array for ionization chamber unit are entad arranged by fan-shaped, and central axis is separately aimed at radiographic source respectively.Each sensitive volume, array for ionization chamber unit is about 4 ° to radiogenic subtended angle, comprises 64 pixel ionization chamber units altogether.Because on the grid dividing plate UNICOM's hole is arranged, the exhaust of each array for ionization chamber unit, gas replenishment process are one step completed, the working gas in each chamber of seal casinghousing all is under the same pressure.After technology is more skilled, each sensitive volume, array for ionization chamber unit can be increased to 8 ° (the pixel ionization chamber unit sum that is comprised will be increased to 128) to radiogenic subtended angle, or bigger.
This detector array for ionization chamber has been realized and has been successfully applied to Tsing-Hua University nuclear and ground the institute development
60Co gamma-rays container examination system.
The utility model also can be applicable to the industrial digital radiation imaging nondestructive detection systems of parts in addition such as automobile crane except that the digital radiation imaging detection system that is applied to large objects such as container.
Claims (4)
1, a kind of middle and high-energy χ, gamma-radiation imaging detector array for ionization chamber, form by a plurality of array for ionization chamber unit that is installed on the support, wherein the ionization chamber unit is made up of housing and electrode system, it is characterized in that described housing is the lattice-shaped cylindrical sealing structure, the front portion is χ, gamma-rays entrance window, and the rear end is welded with as the metal of contact conductor end-ceramic sealing by fusing insulator and exhaust, gas-filled tube; Be provided with the aligning radiographic source between the left and right side plate of described housing and be the entad grid dividing plate of spread pattern, aforementioned barriers is separated into some chambers with enclosure interior, and described electrode system is placed in respectively in the above-mentioned chamber; Electrode in the electrode system is parallel to each other, and each electric level system is fan-shaped and entad distributes, and makes each autoregistration radiographic source of its central axis, each electrode system to radiogenic subtended angle less than 2 °.
2, according to the described device of claim 1, it is characterized in that described grid dividing plate be the sheet metal of linked hole is housed and the fence shape sheet metal that constitutes by a plurality of mutually narrow sheet metals at regular intervals or bonding jumper in any.
3,, it is characterized in that the upper and lower side plate outside surface of described housing has a series of bar shaped serrations according to the described device of claim 1.
4,, it is characterized in that the welding line structure that is welded as not sealing weld material between described grid dividing plate and biside plate according to the described device of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97200610 CN2285905Y (en) | 1997-01-17 | 1997-01-17 | Middle- and high-energy X- and gamma-radiation imaging array ionisation chamber measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97200610 CN2285905Y (en) | 1997-01-17 | 1997-01-17 | Middle- and high-energy X- and gamma-radiation imaging array ionisation chamber measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2285905Y true CN2285905Y (en) | 1998-07-08 |
Family
ID=33922235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97200610 Expired - Lifetime CN2285905Y (en) | 1997-01-17 | 1997-01-17 | Middle- and high-energy X- and gamma-radiation imaging array ionisation chamber measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2285905Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644688B (en) * | 2009-08-28 | 2011-07-20 | 黄河水利委员会黄河水利科学研究院 | Sand-measuring ionization chamber |
| CN102540234A (en) * | 2009-06-30 | 2012-07-04 | 同方威视技术股份有限公司 | Detector equipment for radiation imaging |
| CN101726502B (en) * | 2008-10-24 | 2014-03-12 | 通用电气公司 | System and method of fast KVP switching for dual energy CT |
-
1997
- 1997-01-17 CN CN 97200610 patent/CN2285905Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726502B (en) * | 2008-10-24 | 2014-03-12 | 通用电气公司 | System and method of fast KVP switching for dual energy CT |
| CN102540234A (en) * | 2009-06-30 | 2012-07-04 | 同方威视技术股份有限公司 | Detector equipment for radiation imaging |
| CN101644688B (en) * | 2009-08-28 | 2011-07-20 | 黄河水利委员会黄河水利科学研究院 | Sand-measuring ionization chamber |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |