CN1715895A - Back scatter detector for high kilovolt X-ray spot scan imaging system - Google Patents
Back scatter detector for high kilovolt X-ray spot scan imaging system Download PDFInfo
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- CN1715895A CN1715895A CN 200510084364 CN200510084364A CN1715895A CN 1715895 A CN1715895 A CN 1715895A CN 200510084364 CN200510084364 CN 200510084364 CN 200510084364 A CN200510084364 A CN 200510084364A CN 1715895 A CN1715895 A CN 1715895A
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Abstract
The back scatter detector is one truncated rectangular pyramid structure comprising one bottom plane, one top plane and four side planes to form one sealed casing. The bottom plane as the X-ray incident window has outer layer of aluminum-plastic board and inner layer of barium fluorochloride screen; and the top plane and the four side planes have transparent flash cesium iodide crystal sheets adhered to the inner surface and mounted photomultipliers. The present invention has barium fluorochloride layer to absorb low energy X-rays and transparent cesium iodide crystal sheets to absorb high energy X-rays, and this can greatly reduce afterglow, raise the X-ray absorbing efficiency and raise light converting efficiency.
Description
Technical field
The present invention relates to a kind of social public security checkout facility, the backward scattering detector in particularly a kind of high kilovoltage X ray spot scan imaging system.
Background technology
Present known high kilovoltage (the employed backward scattering detector of X ray spot scan imaging system of 300KeV～10MeV), all be to adopt scintillation material to convert back scattering X-ray to visible light, transmission of visible light is passed on the photocathode of photomultiplier and gets photoelectron, and photoelectron is zoomed into electric signal output by dynode.
If want to improve the diffusing detection sensitivity of the back of the body of X ray, the backward scattering detector must have enough big receiving area, so just disposed somely, caused huge, the complex structure of spot scan imaging system, the failure rate height the backward scattering detector in the pencil beam both sides of generic point scanning imaging system.
And in order to improve the performance index of X ray spot scan imaging system, scintillation material must be low twilight sunset, high X ray absorption efficiency and high light conversion efficiency, and the spectral response of its luminescent spectrum and photomultiplier photocathode is complementary, and requirement can be moistureproof.But in present this backward scattering detector, generally all use single scintillation material, i.e. powder screen class or transparent crystal class.Genus powder screen class, twilight sunset is low, light conversion efficiency is high, but surface density is low, the absorption efficiency of ray is also low; Belong to the transparent crystal class, light conversion efficiency height, X ray absorption efficiency height, Spectral matching are good, but twilight sunset is made moist greatly, easily or price is high, is difficult to satisfy people's requirement.
Summary of the invention
The present invention overcomes the shortcoming of prior art, and a kind of high kilovoltage (X ray spot scan imaging system backward scattering detector of 300KeV～10MeV) of rational in infrastructure, function admirable is provided.
The present invention adopts truncate rectangular pyramid body structure, constitutes a seal casinghousing by facies basialis pyramidis, cone end face and all the other four conical surfaces.Described facies basialis pyramidis is the entrance window of X ray, and its skin is an aluminium-plastic panel, and internal layer is the barium fluochloride screen, and described aluminium-plastic panel is made of the aluminium foil of outer field polyethylene board and internal layer again.Described cone end face and all the other four conical surfaces are that steel plate is connected to each other and forms, and the transparent cesium iodide scintillation crystal sheet that scribbles the moistureproof glue of high-efficient transparent with white reflection glue on the inside surface of cone end face and all the other four conical surfaces.Be installed with photomultiplier respectively on described four conical surfaces.The junction surface of the facies basialis pyramidis of described truncate rectangular pyramid body, cone end face and all the other four conical surfaces adopts lighttight black silicon rubber with moisture-proof function to carry out adhering and sealing.
The present invention adopts rational truncate rectangular pyramid body structure, has increased receiving area, has improved the sensitivity of system.Utilize the barium fluochloride layer of facies basialis pyramidis to sponge low-energy X ray simultaneously, utilize the transparent cesium iodide crystal sheet of cone end face and all the other four conical surfaces fully to absorb sigmatron, this two kinds of scintillation material layerings absorb the compound flicker structure of X ray, reduced twilight sunset greatly, improved the X ray absorption efficiency, improved the conversion efficiency of light, it is applicable to that all high kilovoltages (make the backward scattering detector and use, be particularly useful for making the backward scattering detector in the X ray spot scan imaging check system device of customs's container or large cargo car and use in the X ray spot scan imaging system of 300KeV～10MeV).
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a work synoptic diagram of the present invention.
Among the figure:
The 1-outer cover of steel plate, 2-photomultiplier, 3-cesium iodide crystal sheet, 4-barium fluochloride screen, 5-aluminium-plastic panel, 6-back scattering X-ray, 7-checking matter, 8-form of a stroke or a combination of strokes X-ray beam, 9-chopper wheel, 10-X radiographic source.
Embodiment
Now structure of the present invention and principle of work are described further in conjunction with Figure of description:
The present invention is applicable to high kilovoltage (the X ray spot scan imaging system of 300KeV～10MeV).
As shown in Figure 1, the present invention adopts truncate rectangular pyramid body structure, constitutes a seal casinghousing by facies basialis pyramidis, cone end face and all the other four conical surfaces.Described facies basialis pyramidis is the entrance window of X ray, and its skin is an aluminium-plastic panel 5, and internal layer is a barium fluochloride screen 4, and described aluminium-plastic panel 5 is made up of the polyethylene board of 2～5 millimeters thickness and the aluminium foil of 0.02～0.04 millimeter thickness; Aluminium-plastic panel 5 has high X ray permeability, not only played a supportive role to the light sealing but also to barium fluochloride screen 4, these aluminium-plastic panel 5 materials are respectively 93.4% and 94.4% to the transmitance of the X ray of 40KeV and 60KeV, so just can allow back scattering X-ray 6 see through fully.Being pasted with surface density on the inside surface of aluminium-plastic panel 5 is the powdery barium fluochloride screen 4 of the low twilight sunset of every square centimeter 0.15～0.20 gram, high light conversion efficiency.Because consider its light output problem, it is very thick that barium fluochloride screen 4 can not be made, through test relatively,, be every square centimeter 0.15～0.20 gram as its best surface density of backward scattering video screen to the x-ray source of 450KeV.Barium fluochloride screen 4 is secured on the inside surface of aluminium-plastic panel 5, and its absorption efficiency to the X ray of 40KeV is 93%, and transmitance is 6%.Therefore the energy X ray that is lower than 40KeV can see through barium fluochloride and shields 4 and incide just very little on the cesium iodide crystal sheet 3 on cone end face and all the other four conical surfaces.
Described cone end face and all the other four conical surfaces are that outer cover of steel plate 1 is connected to each other and forms, and the transparent cesium iodide crystal sheet 3 of the moistureproof glue that scribbles high-efficient transparent on the inside surface of cone end face and all the other four conical surfaces with white reflection glue.The X ray absorption efficiency height of transparent cesium iodide crystal sheet 3, light output is high relatively, and price is relatively cheap, and its material thickness can be selected processing as required.But the twilight sunset of cesium iodide crystal sheet 3 is in general bigger than normal, according to the twilight sunset of scintillator and relevant this rule of absorbed dose rate of scintillator acceptance with absorbed dose, because the equivalent atom ordinal number higher (being 54.18) of cesium iodide crystal sheet 3 is also inevitable bigger to the absorption coefficient of more low-energy X ray.If the low energy composition of incident X-rays is abundanter, and shine directly on the cesium iodide crystal sheet 3, big absorbed dose rate and big absorbed dose must take place in the incidence surface layer of cesium iodide crystal sheet 3, thereby cause the result of big twilight sunset.But after adopting two kinds of above-mentioned scintillation material layerings to absorb the structure of the compound flicker of X ray, low-energy X-ray is all tried one's best absorbed by the barium fluochloride of ground floor screen 4, the twilight sunset of the cesium iodide crystal sheet 3 of the second layer just can reduce greatly like this.In order to prevent the deliquescence of cesium iodide crystal sheet 3, the moistureproof glue of coating one deck high-efficient transparent on the light output surface of transparent cesium iodide crystal sheet 3.Through so constituting high kilovoltage X ray backward scattering detector, have high X ray absorption efficiency, high light conversion efficiency, low twilight sunset, low price, be easy to process and good performance such as protection against the tide.
Be installed with 2～5 photomultipliers 2 respectively on described four conical surfaces and the cone end face.The degree of depth L that each photomultiplier 2 stretches in the outer cover of steel plate 1 is 40～50 millimeters---this is the degree of depth that stretches into of the maximum light transmission that obtains through overtesting and receiving efficiency.
The junction surface of the facies basialis pyramidis of described truncate rectangular pyramid body, cone end face and all the other four conical surfaces adopts lighttight black silicon rubber with moisture-proof function to carry out adhering and sealing.
As shown in Figure 2, when the present invention worked, x-ray source 10 was the x-ray source of 450KeV, and the fan-shaped x-ray beam that it sends is shielded into form of a stroke or a combination of strokes X-ray beam 8 by chopper wheel 9; When form of a stroke or a combination of strokes X-ray beam 8 shines on the checking matter 7, formed the back scattering X-ray of dispersing 6; When back scattering X-ray 6 sees through the X ray entrance window that aluminium-plastic panel 5 and barium fluochloride screen 4 combine, its low energy composition major part is by 4 absorptions of barium fluochloride screen and be converted to visible light, and the high energy composition that penetrates is when inciding on the transparent cesium iodide crystal sheet 3, fully absorbed by cesium iodide crystal sheet 3 and is converted to visible light; Transmission of visible light is given the photocathode of photomultiplier 2, gets photoelectron on photocathode, and photoelectron is amplified by dynode and exports electric signal.
When chopper wheel 9 is rotated around x-ray source 10,8 pairs of checking matters 7 of form of a stroke or a combination of strokes X-ray beam form flying-spot scanner in vertical direction, because checking matter 7 is in the intensity difference of different position back scattering X-rays 6, thus also respective change of signal of the present invention, thus form column signal output.Along with checking matter 7 and x-ray source 10 and the present invention do the relative motion of horizontal direction, just formed the output of a series of signal and backscatter images.
Claims (7)
1. back scatter detector for high kilovolt X-ray spot scan imaging system, comprise photomultiplier (2), it is characterized in that described backward scattering detector adopts two kinds of scintillation material layering composite structures of truncate rectangular pyramid body carrying, constitutes a seal casinghousing by facies basialis pyramidis, cone end face and all the other four conical surfaces; Described facies basialis pyramidis skin is aluminium-plastic panel (5), and internal layer is a barium fluochloride screen (4), and described aluminium-plastic panel (5) is made of the aluminium foil of outer field polyethylene board and internal layer; Described cone end face and all the other four conical surfaces are that outer cover of steel plate (1) is connected to each other and forms, and are transparent cesium iodide crystal sheet (3) on the inside surface of cone end face and all the other four conical surfaces; Be installed with photomultiplier (2) respectively on described four conical surfaces and the cone end face.
2. a kind of back scatter detector for high kilovolt X-ray spot scan imaging system as claimed in claim 1 is characterized in that scribbling transparent moistureproof glue on cesium iodide crystal sheet (3) surface.
3. a kind of back scatter detector for high kilovolt X-ray spot scan imaging system as claimed in claim 1 is characterized in that cesium iodide crystal sheet (3) reflects glue on the inside surface of cone end face and all the other four conical surfaces with white.
4. a kind of back scatter detector for high kilovolt X-ray spot scan imaging system as claimed in claim 1 is characterized in that the junction surface of facies basialis pyramidis, cone end face and all the other four conical surfaces of described truncate rectangular pyramid body adopts black silicon rubber to carry out adhering and sealing.
5. a kind of back scatter detector for high kilovolt X-ray spot scan imaging system as claimed in claim 1 is characterized in that described aluminium-plastic panel (5) is made up of the polyethylene board of 2～5 millimeters thickness and the aluminium foil of 0.02～0.04 millimeter thickness.
6. a kind of back scatter detector for high kilovolt X-ray spot scan imaging system as claimed in claim 1, the surface density that it is characterized in that barium fluochloride screen (4) are every square centimeter 0.15～0.20 gram.
7. a kind of volt X ray spot scan imaging system backward scattering detector that is higher than as claimed in claim 1, it is characterized in that described photomultiplier (2) quantity is 2～5, the degree of depth L that each photomultiplier (2) stretches in the outer cover of steel plate (1) is 40～50 millimeters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200510084364A CN100578204C (en) | 2005-07-15 | 2005-07-15 | Back scatter detector for high kilovolt X-ray spot scan imaging system |
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| CN200510084364A CN100578204C (en) | 2005-07-15 | 2005-07-15 | Back scatter detector for high kilovolt X-ray spot scan imaging system |
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| CN1715895A true CN1715895A (en) | 2006-01-04 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102933957A (en) * | 2010-03-14 | 2013-02-13 | 拉皮斯坎系统股份有限公司 | Personnel screening system |
| US9182516B2 (en) | 2007-02-01 | 2015-11-10 | Rapiscan Systems, Inc. | Personnel screening system |
| US9285325B2 (en) | 2007-02-01 | 2016-03-15 | Rapiscan Systems, Inc. | Personnel screening system |
| US9291741B2 (en) | 2007-02-01 | 2016-03-22 | Rapiscan Systems, Inc. | Personnel screening system |
| EP2548050A4 (en) * | 2010-03-14 | 2017-05-17 | Rapiscan Systems, Inc. | Multiple screen detection systems |
| US9891314B2 (en) | 2014-03-07 | 2018-02-13 | Rapiscan Systems, Inc. | Ultra wide band detectors |
| US10134254B2 (en) | 2014-11-25 | 2018-11-20 | Rapiscan Systems, Inc. | Intelligent security management system |
| CN109031397A (en) * | 2018-08-03 | 2018-12-18 | 山西中辐核仪器有限责任公司 | A kind of radiation detector measurement light-shading apparatus and its method |
| CN111081728A (en) * | 2019-12-25 | 2020-04-28 | 上海奕瑞光电子科技股份有限公司 | X-ray flat panel detector and preparation method thereof |
| US10720300B2 (en) | 2016-09-30 | 2020-07-21 | American Science And Engineering, Inc. | X-ray source for 2D scanning beam imaging |
| US11280898B2 (en) | 2014-03-07 | 2022-03-22 | Rapiscan Systems, Inc. | Radar-based baggage and parcel inspection systems |
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| EP1147406A1 (en) * | 1998-12-22 | 2001-10-24 | American Science & Engineering, Inc. | Unilateral hand-held x-ray inspection apparatus |
| JP2001208705A (en) * | 2000-01-27 | 2001-08-03 | Mitsubishi Heavy Ind Ltd | Scattered x-ray type defect detector, and x-ray detector |
| JP2004317300A (en) * | 2003-04-16 | 2004-11-11 | Toshiba Corp | Plane radiation detector and its manufacturing method |
| CN1207558C (en) * | 2003-08-22 | 2005-06-22 | 貊大卫 | Backscattering type X-ray scanner |
| CN2816803Y (en) * | 2005-07-15 | 2006-09-13 | 北京中盾安民分析技术有限公司 | Back-diffusion detector for high KV X-ray spot scanning imaging system |
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2005
- 2005-07-15 CN CN200510084364A patent/CN100578204C/en active Active
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9285325B2 (en) | 2007-02-01 | 2016-03-15 | Rapiscan Systems, Inc. | Personnel screening system |
| US9291741B2 (en) | 2007-02-01 | 2016-03-22 | Rapiscan Systems, Inc. | Personnel screening system |
| US9182516B2 (en) | 2007-02-01 | 2015-11-10 | Rapiscan Systems, Inc. | Personnel screening system |
| EP2548011A4 (en) * | 2010-03-14 | 2017-08-02 | Rapiscan Systems, Inc. | Personnel screening system |
| EP2548050A4 (en) * | 2010-03-14 | 2017-05-17 | Rapiscan Systems, Inc. | Multiple screen detection systems |
| EP2548009A4 (en) * | 2010-03-14 | 2017-08-02 | Rapiscan Systems, Inc. | Personnel screening system |
| EP2548012A4 (en) * | 2010-03-14 | 2017-08-02 | Rapiscan Systems, Inc. | Personnel screening system |
| CN102933957A (en) * | 2010-03-14 | 2013-02-13 | 拉皮斯坎系统股份有限公司 | Personnel screening system |
| CN102933957B (en) * | 2010-03-14 | 2015-07-01 | 拉皮斯坎系统股份有限公司 | Personnel screening system |
| US11280898B2 (en) | 2014-03-07 | 2022-03-22 | Rapiscan Systems, Inc. | Radar-based baggage and parcel inspection systems |
| US9891314B2 (en) | 2014-03-07 | 2018-02-13 | Rapiscan Systems, Inc. | Ultra wide band detectors |
| US10134254B2 (en) | 2014-11-25 | 2018-11-20 | Rapiscan Systems, Inc. | Intelligent security management system |
| US10713914B2 (en) | 2014-11-25 | 2020-07-14 | Rapiscan Systems, Inc. | Intelligent security management system |
| US10720300B2 (en) | 2016-09-30 | 2020-07-21 | American Science And Engineering, Inc. | X-ray source for 2D scanning beam imaging |
| CN109031397A (en) * | 2018-08-03 | 2018-12-18 | 山西中辐核仪器有限责任公司 | A kind of radiation detector measurement light-shading apparatus and its method |
| CN111081728A (en) * | 2019-12-25 | 2020-04-28 | 上海奕瑞光电子科技股份有限公司 | X-ray flat panel detector and preparation method thereof |
| CN111081728B (en) * | 2019-12-25 | 2023-08-11 | 上海奕瑞光电子科技股份有限公司 | X-ray flat panel detector and preparation method thereof |
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| CN100578204C (en) | 2010-01-06 |
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