CN1142425C - Detector array for ionization chamber and its use - Google Patents
Detector array for ionization chamber and its use Download PDFInfo
- Publication number
- CN1142425C CN1142425C CNB001215450A CN00121545A CN1142425C CN 1142425 C CN1142425 C CN 1142425C CN B001215450 A CNB001215450 A CN B001215450A CN 00121545 A CN00121545 A CN 00121545A CN 1142425 C CN1142425 C CN 1142425C
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- ionization chamber
- sealing
- insulator
- pressure
- fusing
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- Electron Tubes For Measurement (AREA)
Abstract
The present invention belongs to an application field of a nuclear technique. Each array ionization chamber unit of the present invention is composed of a voltage resisting sealed outer shell, high-voltage gas, a window, an electrode system and a fusion sealed insulator lead out terminal, wherein the voltage resisting sealed outer shell is also used as a high-voltage electrode. A shell inner part or all the high-voltage electrode pieces are welded with the sealed outer shell. The present invention has the advantages of portability and shock resistance, and the present invention can be used for mobile radiation imaging detection systems, fixed radiation imaging detection systems and other forms of radiation imaging detection systems and is particularly suitable for the need of a vehicle based detection station.
Description
The application is one and divides an application that the application number of original application case is 98101501.8, and the applying date is 980403, and denomination of invention is " vehicle-carried gamma ray digital radiation imaging mobile detection station and an array detecting device thereof ".
Technical field
The invention belongs to the Application of Nuclear Technology field, particularly a kind of structural design of light shatter-proof inflation detector array for ionization chamber.
Background technology
Existing array for ionization chamber type sniffer can satisfy radiation imageable and detect requirement, but also has some defective, as: 1. in the array for ionization chamber unit, independent thick and heavy pressure-resistant seal shell is arranged in addition except that electrode system, enlarged markedly the weight of probe unit; 2. the inner structure complexity causes the reduction of anti-seismic performance.These defectives are unfavorable for its application in the vehicular pick-up unit.
Summary of the invention
The objective of the invention is to overcome the weak point of prior art, a kind of detector array for ionization chamber is provided.Have light shatter-proof advantage, can be applicable to the radiation imageable detection system of movable type, fixed or other form, adapt to the needs of vehicular measuring station more.
The invention provides a kind of detector array for ionization chamber, wherein each array for ionization chamber unit is made up of pressure-resistant seal housing, gases at high pressure, window, electrode system and sealing by fusing insulator exit, said pressure-resistant seal housing double as high-pressure stage; Part or all of high-tension electricity pole piece in the shell welds mutually with can.Said insulator can be double-level-metal-ceramic sealing by fusing insulator; comprise the casting coping and the central metal silk that are welded into one; cover is encapsulated in the ceramic inner pipe under outer this top cover of tinsel; this ceramic inner pipe appropriate location cover front cover pottery short tube; this pottery upper end of short tube is fixed by a metal coating ring, its lower end overcoat front cover metal short tube.
Description of drawings
Fig. 1 is a detector array for ionization chamber example structure synoptic diagram of the present invention.
Fig. 2 is an insulator structure synoptic diagram among Fig. 1.
Embodiment the present invention proposes a kind of detector array for ionization chamber embodiment, the feature of its array for ionization chamber cellular construction is to have cancelled the independent pressure-resistant seal shell that separates with electrode system, and make capsul itself also double as be the part of high-pressure stage.Simultaneously, for removing the influence of insulator leakage current, adopted double-level-metal pottery sealing by fusing insulator to draw signal.
The primary structure of this kind array for ionization chamber as shown in Figure 1.This is the outward appearance front elevation and the tomography sectional view that comprise the array for ionization chamber unit of a plurality of pixel ionization chamber unit.17 is double-level-metal-ceramic sealing by fusing insulators among the figure, the 18th, and the high-tension electricity pole piece, the 19th, collect pole piece, 20 then is the capsul of having held concurrently the high-pressure stage effect.As seen from the figure, each high pressure pole piece 18 is UNICOMs with capsul 20, does not have the problem that is short-circuited between them of preventing, has significantly improved reliability.Simultaneously, can just high pressure pole piece 18 be welded mutually with can 20 at a certain distance, thereby strengthen the compressive resistance of shell greatly.The thickness that this just can significantly reduce shell greatly alleviates the weight of array for ionization chamber unit.Collect pole piece 19 and rely on high insulating material plug-in unit to be fixed between the high-field electrode 18, and strict with it insulation.The signal of collector is then drawn by double-level-metal-ceramic sealing by fusing insulator 17.The structure of double-level-metal-ceramic sealing by fusing insulator 17 as shown in Figure 2.
Present embodiment double-level-metal-ceramic sealing by fusing insulator has 171,173,175 and two alumina ceramic tubes of three metalworks 172,174 and constitutes, as shown in Figure 2.Visible top cover 171 fuses with the central metal silk among the figure, and its center tinsel links with collecting pole piece, in order to output signal.Metalwork 173 is " protection ring ", should ground connection when ionization chamber is worked.Metalwork 175 is a base, must weld mutually with the can of ionization chamber unit.Each ceramic pipe and metalwork joint hold the sealing-in of envelope technology with metal-ceramic.Each weld seam all should guarantee that its slip is less than 1 * 10
-8Pascal's liter/second.At some in particular cases, ceramic pipe 172 is interchangeable with synthetic cut stone (alumina single crystal) pipe, improves its insulation resistance and moisture resistance performance.When ionization chamber is worked, the leakage current that the operating voltage that adds on capsul and the high-pressure stage produces on ceramic pipe 174 by " protection ring " 173 flow into " ", can not influence signal measurement again.The potential difference (PD) that central authorities' tinsel and protection ring are 173 is very little, thereby the leakage current that produces on ceramic pipe 172 can be ignored.Because the insulation resistance of synthetic cut stone pipe can be up to 10
16Ω, thereby also can be directly replace double-level-metal-ceramic sealing by fusing insulator and reach the effect of same reduction influence of leakage current with single-layer metal-jewel sealing by fusing insulator.
The compressive resistance of this array of structures ionization chamber unit is better, so can charge into the working gas of bigger pressure, obtains higher detection sensitivity.Simultaneously because saved independent pressure-resistant seal shell, the thickness of capsul of having simplified electrode system structure and attenuate, just significantly reduced the weight of ionization chamber unit, improved reliability and strengthened shock resistance.
Array for ionization chamber of the present invention will more be applicable to the vehicle-mounted container pick-up unit.Certainly, it also can be applicable to other nondestructive examination detection system.
Present embodiment is used for vehicle-mounted Co-60 container examination system, and detector system has been installed 32-64 array for ionization chamber unit altogether, and every unit contains 16 pixel ionization chamber units, contains 512-1024 pixel ionization chamber unit altogether.The detection performance index that this container examination system can reach are: the density contrast sensitivity (CI value) to 100 millimeters iron shield absorbers is 7 ‰; Image quality index (IQI value) under the same absorber condition is 2.5%; Penetrating power (SP value) is a 220-240mm iron; The maximum dosage that detects is less than 0.02mGy.
Claims (2)
1, a kind of detector array for ionization chamber, wherein each array for ionization chamber unit is made up of pressure-resistant seal housing, gases at high pressure, window, electrode system and sealing by fusing insulator exit, these envelope filled dress gases at high pressure, this shell bottom plate constitutes window, this electrode system is made up of high pressure pole piece of alternately arranging mutually and collection pole piece, this shell upper end is provided with sealing by fusing insulator exit, it is characterized in that said pressure-resistant seal housing double as high-pressure stage; Part or all of high-tension electricity pole piece in the shell welds mutually with can.
2; detector array for ionization chamber as claimed in claim 1; it is characterized in that; said insulator is double-level-metal-ceramic sealing by fusing insulator; comprise casting coping (171); tinsel; ceramic inner pipe (172); metal coating ring (173); pottery short tube (174) and metab (175); wherein; casting coping (171) is integral with the central metal wire bond that passes casting coping (171); cover is encapsulated in the outer ceramic inner pipe (172) of tinsel under this casting coping (171); this ceramic inner pipe (172) appropriate location cover front cover pottery short tube (174); this pottery short tube (174) upper end and metal coating ring (a 173) sealing by fusing, its lower end overcoat front cover metab (175).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001215450A CN1142425C (en) | 1998-04-03 | 1998-04-03 | Detector array for ionization chamber and its use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001215450A CN1142425C (en) | 1998-04-03 | 1998-04-03 | Detector array for ionization chamber and its use |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98101501 Division CN1068118C (en) | 1998-04-03 | 1998-04-03 | Vehicle-carried gamma ray digital radiation imaging mobile detection station and array detecting device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1290858A CN1290858A (en) | 2001-04-11 |
| CN1142425C true CN1142425C (en) | 2004-03-17 |
Family
ID=4588865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001215450A Expired - Lifetime CN1142425C (en) | 1998-04-03 | 1998-04-03 | Detector array for ionization chamber and its use |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1142425C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019222321A1 (en) * | 2018-05-17 | 2019-11-21 | Corning Incorporated | Stiffened thin inorganic membranes and methods for making the same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427882C (en) * | 2006-10-13 | 2008-10-22 | 清华大学 | Gas ionization type middle-low-energy X.gamma-ray detector |
| CN101149438B (en) * | 2007-09-26 | 2010-10-13 | 中国工程物理研究院核物理与化学研究所 | Tritium-measuring method and equipment |
| CN107218958A (en) * | 2017-05-15 | 2017-09-29 | 中国海洋石油总公司 | A kind of measuring electrode and preparation method thereof |
-
1998
- 1998-04-03 CN CNB001215450A patent/CN1142425C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019222321A1 (en) * | 2018-05-17 | 2019-11-21 | Corning Incorporated | Stiffened thin inorganic membranes and methods for making the same |
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| Publication number | Publication date |
|---|---|
| CN1290858A (en) | 2001-04-11 |
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Granted publication date: 20040317 |