CN2257927Y - Large area thin window nuclear radiation detector - Google Patents
Large area thin window nuclear radiation detector Download PDFInfo
- Publication number
- CN2257927Y CN2257927Y CN 95213899 CN95213899U CN2257927Y CN 2257927 Y CN2257927 Y CN 2257927Y CN 95213899 CN95213899 CN 95213899 CN 95213899 U CN95213899 U CN 95213899U CN 2257927 Y CN2257927 Y CN 2257927Y
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- detector
- seal
- electrode
- end cap
- entrance window
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Abstract
The utility model relates to a nuclear radiation detector, mainly comprising a left and a right end covers, a high-voltage electrode, a center electrode, an entrance window, insulators, a protective seal cover, a preamplifier, a cable socket, a protecting film, etc., wherein the entrance window of the detector is made of large-area and thin stainless foils; the insulators on the both ends of the entrance window adopt protection ring structures and are coated with damp proofing glue; the center electrode adopts a cylindrical structure. The utility model is suitable for measuring the radiation intensity, especially the radiation intensity of the low energy gamma radiant intensity.
Description
The utility model belongs to the nuclear radiation measurement technical field, and particularly a kind of measurement γ radiation is as the detector of low energy gamma radiation intensity.
Measure the γ radiation at present and use four kinds of detectors usually, be the GM counter tube, ionization chamber, proportional counter tube and scintillation probe (be crystal add photoelectricity increase pipe), use the belt nuclear weigh instrument of these four kinds of detectors on the market production marketing to be arranged all at home and abroad, and in the majority with ionization chamber.No matter but which kind of detector all can not satisfy the requirement of light quality of material metering.With the ionization chamber is example, no matter single electrode stainless steel ionization chamber, or multi-electrode carbon steel ionization chamber, perhaps multi-electrode all steel ionization chamber all uses 10-100mCi's
137The Cs radioactive source, therefore just very weak because its energy is higher to the induction of light quality of material variation, can not carry out effective mass metrology, if the radioactive source of employing low energy (as
241The Am radioactive source),, make when low-energy penetrates locular wall decay too many then because the ionization locular wall is all thicker, and the wall of carbon steel ionization chamber is thicker, thereby, output signal too a little less than, can not measure light quality of material effectively equally.If adopt low energy gamma radiation and make detector with scintillation probe (being that crystal adds photomultiplier), then require to use line source greater than belt width, this has not only strengthened cost, and is also very inconvenient to using.
The purpose of this utility model is to overcome the problem that exists in the existing counting, proposes a kind of large tracts of land thin window nuclear radiation detector.
The technical scheme of large tracts of land thin window nuclear radiation detector of the present utility model is that it is mainly by a left side; right end cap; central electrode; the ceramic seal insulator; high-field electrode; entrance window; seal closure; seal pad; O-ring seal; cable socket; gas outlet; prime amplifier; diaphragm and square groove constitute; central electrode two ends wherein are by a left side; right connecting link is fixed on a left side; on the right end cap; on a left side; the ceramic seal insulator and the seal closure of band protection ring are housed respectively on the right end cap; gas outlet also is housed on left end cap; in right seal closure, prime amplifier is housed; being electrically connected by the cable socket on the seal pad of prime amplifier links to each other with secondary instrument; an entrance window and a left side; right end cap; high-field electrode is fixed together; whole ionization chamber is placed in the square groove, and the top of groove is equipped with protective film.Described ceramic seal insulated terminal is by the electrode fairlead; upper and lower insulated column; ground protection ring and sealing ring constitute; electrode fairlead wherein is fixed on the insulated column; protection ring is fixed on down on the insulated column; the surface of upper and lower insulated column scribbles moisture-proof coating, and is connected with left and right end cap by sealing ring.Described high-field electrode is made up of left and right side plate and base plate, and its cross section roughly takes the shape of the letter U.Described seal pad is by O-ring seal and compress volution prime amplifier is sealed in the right seal closure.Described central electrode is a cylindric electrode, and as stainless-steel tube, its effective length is 200-1200mm.Described entrance window is stainless steel foil or titanium foil, and its thickness is 0.05-0.3mm, and width is 50-150mm, and length is 250-1250mm.The thickness of described entrance window is 0.05mm, and width is 100mm, and length is 500-800mm.Be filled with inert gas xenon, argon or mixed gas in the detector.Describedly between square groove and ionization chamber, be filled with packing material.
Large tracts of land thin window nuclear radiation detector of the present utility model is a kind of ionization chamber of brand new, its advantage mainly be not only higher γ radiation to energy (as
137The Cs source) have very high sensitivity, especially to low energy gamma radiation (as
241The Am source) have very high sensitivity equally, with realize existing detector (comprising existing ionization chamber) irrealizable mass metrology to light mass transport.
It is square or rectangle that the utility model is designed to the cross section to ionization chamber, and the entrance window of ray adopts large tracts of land stainless steel foil or titanium foil, is beneficial to penetrating of low-energy.The ceramic seal insulator that a band protection ring is all arranged on the end cap of the left and right sides is to reduce the influence of leakage current to measuring accuracy.For keeping the even of electric field, central electrode adopts cylindrical structural, and whole ionization chamber material constitutes by stainless steel.For keeping the work of ionization chamber long-term stability, all welding comprise that the Ar arc welding is all adopted in the welding of stainless steel foil.
For further specifying the structure of large tracts of land thin window nuclear radiation detector of the present utility model, specifically describe with reference to the accompanying drawings and in conjunction with the embodiments, its accompanying drawing has:
Fig. 1,2 is respectively the front view and the cut-open view of detector of the present utility model;
Fig. 3 is the structural representation of ceramic seal insulator wherein.
In Fig. 1-3:
1,2, left and right sides end cap 3,4, ceramic seal insulator
5, gas outlet 6,7, left and right sides seal closure
8, central electrode 9,10, left and right sides connecting link
11,12, left side plate 13, base plate
14, entrance window 15, press box
16, prime amplifier 17, screw rod
18, seal pad 19, O-ring seal
20, compress volution 21, multicore seal socket or cable socket
22, diaphragm 23, square groove
24, packing material 25, electrode fairlead
26, go up insulated column 27, ground protection ring
28, following insulated column 29, sealing ring
30, moisture-proof coating
In the accompanying drawing 1,2, be welded with the ceramic seal insulator 3,4 of band protection ring on left end cap 1 and the right end cap 2, also be welded with gas outlet 5 on the left end cap 1, for vacuumizing and inflate usefulness.Also be welded with left seal closure 6 on the left end cap 1, to prevent dust and moisture contamination ceramic seal insulator 3,4.Central electrode 8 is stainless-steel tubes, and its length promptly is the effective length of ionization chamber, and scope is at 200-1200mm, and this electrode is by left and right sides connecting link 9,10 and 1,2 welding of left and right sides end cap.Left plate 11, right plate 12 and base plate 13 can be an integral body, also can be divided into three and weld together.Entrance window 14 is the stainless steel foil of thickness 0.05-0.3mm, and width is 50-150mm, and length is slightly longer than central electrode 8, and scope is at 250-1250mm, entrance window 14 and left and right sides end cap 1,2, left side plate 11,12 and press box 15 Ar arc welding.Be welded with right seal closure 7 on the right end cap 2, prime amplifier 16 is housed in the cover, it is fixing with three screw rods 17, being electrically connected by the multicore seal socket 21 on the seal pad 18 of prime amplifier 16 is connected with secondary instrument, seal pad 18 is by O-ring seal 19 and compress volution 20 prime amplifier 16 is sealed in the seal closure 7, to prevent entering of water vapour and dust.Whole ionization chamber is placed in the square groove 23, and packing material 24 is arranged between groove and the ionization chamber, and the top of groove is equipped with the protective film 22 of dustproof usefulness.Ionization chamber fills with inert gas xenon or argon or mixed gas.
In the accompanying drawing 3, design has ground protection ring 27 between last insulated column 26 and the following insulated column 28, and ground is arrived in insulation leakagel volume leakage circulation overprotection ring 27 direct short-circuits that high pressure is caused, and does not participate in signal output.Electrode fairlead 25 and last insulated column 26 vacuum brazings.All metalworks adopt kovar alloy, and insulated column 26,28 surfaces are coated with moisture-proof coating 30, the diameter Ф 10-25mm of insulated column 26,28, and height 8-15mm makes insulated column 26,28 that enough shock resistances and anti-electric breakdown strength are arranged like this.Have enough insulation resistances simultaneously.Sealing ring 29 is connected with left and right end cap 1,2.
The principle of work of ionization chamber is: after low-energy passes protective film and stainless steel foil, enter ionization chamber, on electrode, get secondary electron, it is right that secondary electron makes ionized inert gas generate negative ions, simultaneously ray also can be directly and gas molecule effect generation negative ions right, under ionization chamber interpolar effect of electric field, move to opposite polarity electrode direction respectively, produce the current signal that is proportional to incident γ radiation intensity at external loop, this signal gets final product metering-in control system after prime amplifier amplifies.
Embodiment:
The large tracts of land thin window nuclear radiation detector that uses on the low energy gamma radiation high precision belt uclear scale as shown in Fig. 1-3.The xsect of detector (ionization chamber) is 110 * 110mm, and entrance window is a stainless steel foil, and its thickness is 0.05mm, and width is 110mm, and length is 720mm, and the effective width of central electrode is 700mm, and the insulated column diameter is 15mm, highly is 10mm.The sensitivity 1.5 * 10 of ionization chamber
-4AC
-1Kgh, background current (comprising leakage current) is less than 1 * 10
-12A is distance 100mCi's
241When 1 meter of Am radiation source was tested, static long-time stability were better than 0.25%.
Claims (9)
1; a kind of large tracts of land thin window nuclear radiation detector; it is characterized in that it is mainly by a left side; right end cap; central electrode; the ceramic seal insulator; high-field electrode; entrance window; seal closure; seal pad; O-ring seal; cable socket; gas outlet; prime amplifier; diaphragm and square groove constitute; central electrode two ends wherein are by a left side; right connecting link is fixed on a left side; on the right end cap; on a left side; the ceramic seal insulator and the seal closure of band protection ring are housed respectively on the right end cap; gas outlet also is housed on left end cap; in right seal closure, prime amplifier is housed; being electrically connected by cable socket on the seal pad and secondary instrument of prime amplifier joined; an entrance window and a left side; right end cap; high-field electrode is fixed together; whole ionization chamber is placed in the square groove, and the top of groove is equipped with protective film.
2, detector as claimed in claim 1; it is characterized in that described ceramic seal insulated terminal is by the electrode fairlead; upper and lower insulated column; ground protection ring and sealing ring constitute; electrode fairlead wherein is fixed on the insulated column; protection ring is fixed on down on the insulated column, and the surface of upper and lower insulated column scribbles moisture-proof coating, and is connected with left and right end cap by sealing ring.
3, detector as claimed in claim 1 or 2 is characterized in that described high-field electrode is made up of left and right side plate and base plate, and its cross section roughly takes the shape of the letter U.
4, detector as claimed in claim 1 is characterized in that described seal pad is by O-ring seal with compress volution prime amplifier is sealed in the right seal closure.
5, detector as claimed in claim 1 is characterized in that described central electrode is a cylindric electrode, and as stainless-steel tube, its effective length is 200-1200mm.
6, detector as claimed in claim 1 is characterized in that described entrance window is stainless steel foil or titanium foil, and its thickness is 0.05-0.3mm, and width is 50-150mm, and length is 250-1250mm.
7, as claim 1 or 6 described detectors, the thickness that it is characterized in that described entrance window is 0.05mm, and width is 100mm, and length is 500-800mm.
8, detector as claimed in claim 1 is characterized in that being filled with in the detector inert gas xenon, argon or mixed gas.
9, detector as claimed in claim 1 is characterized in that describedly being filled with packing material between square groove and ionization chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95213899 CN2257927Y (en) | 1995-06-16 | 1995-06-16 | Large area thin window nuclear radiation detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95213899 CN2257927Y (en) | 1995-06-16 | 1995-06-16 | Large area thin window nuclear radiation detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2257927Y true CN2257927Y (en) | 1997-07-16 |
Family
ID=33863664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95213899 Expired - Fee Related CN2257927Y (en) | 1995-06-16 | 1995-06-16 | Large area thin window nuclear radiation detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2257927Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100442467C (en) * | 2005-11-11 | 2008-12-10 | 中国辐射防护研究院 | A processing technique for moisture-proof insulation of preamplifier |
| CN102768235A (en) * | 2012-08-01 | 2012-11-07 | 宁德新能源科技有限公司 | Ray sensor for detecting surface density of pole piece of lithium ion battery |
| CN103293546A (en) * | 2012-03-02 | 2013-09-11 | 三菱电机株式会社 | Radiation beam monitoring device |
| CN103681179A (en) * | 2013-12-31 | 2014-03-26 | 中国原子能科学研究院 | Panel-shaped ionization chamber |
-
1995
- 1995-06-16 CN CN 95213899 patent/CN2257927Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100442467C (en) * | 2005-11-11 | 2008-12-10 | 中国辐射防护研究院 | A processing technique for moisture-proof insulation of preamplifier |
| CN103293546A (en) * | 2012-03-02 | 2013-09-11 | 三菱电机株式会社 | Radiation beam monitoring device |
| CN103293546B (en) * | 2012-03-02 | 2015-07-22 | 三菱电机株式会社 | Radiation beam monitoring device |
| CN102768235A (en) * | 2012-08-01 | 2012-11-07 | 宁德新能源科技有限公司 | Ray sensor for detecting surface density of pole piece of lithium ion battery |
| CN102768235B (en) * | 2012-08-01 | 2017-07-18 | 宁德新能源科技有限公司 | A kind of radiation transducers detected for electrodes of lithium-ion batteries surface density |
| CN103681179A (en) * | 2013-12-31 | 2014-03-26 | 中国原子能科学研究院 | Panel-shaped ionization chamber |
| CN103681179B (en) * | 2013-12-31 | 2016-06-22 | 中国原子能科学研究院 | A kind of plane ionization chamber |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |