CN1112583C - Digital radiation image forming type apparatus for investigating lorge guest materials - Google Patents
Digital radiation image forming type apparatus for investigating lorge guest materials Download PDFInfo
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- CN1112583C CN1112583C CN99110839A CN99110839A CN1112583C CN 1112583 C CN1112583 C CN 1112583C CN 99110839 A CN99110839 A CN 99110839A CN 99110839 A CN99110839 A CN 99110839A CN 1112583 C CN1112583 C CN 1112583C
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- 230000005855 radiation Effects 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 title description 6
- 230000000694 effects Effects 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000003384 imaging method Methods 0.000 claims abstract description 5
- 230000033001 locomotion Effects 0.000 claims description 21
- 238000013519 translation Methods 0.000 claims description 12
- GUTLYIVDDKVIGB-OUBTZVSYSA-N Cobalt-60 Chemical compound [60Co] GUTLYIVDDKVIGB-OUBTZVSYSA-N 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 17
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000005025 nuclear technology Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 7
- 230000002950 deficient Effects 0.000 description 5
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- 230000002285 radioactive effect Effects 0.000 description 4
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003325 tomography Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- G01V5/22—
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G01V5/226—
Abstract
The present invention belongs to the field of the application of nuclear technology, which comprises detection components, a translational driving mechanism, a signal processing system, an annular rotary scanning machine frame and a machine base thereof, etc., wherein the detection components, the translational driving mechanism and the signal processing system are composed of radiation sources of a gamma radioisotope of high specific activity, a shielding container of the radiation source, an irradiation chamber of the radiation source, a collimator and array detectors, and the detection components are arranged on the annular rotary machine frame. The present invention can conveniently obtain a projection image in any determined direction and a tomographic image of a specified part, and still use only one set of radiation sources, detectors and lossless detection devices of digital radiation imaging of a large object in an information system, and thereby, the detection sensitivity and the detection accuracy of the devices can be prominently enhanced.
Description
The invention belongs to the Application of Nuclear Technology field, the digital radiation imaging pick-up unit of large objects such as particularly a kind of container or guided missile.Its employing high specific activity gamma activity isotope radiographic source (as
60Co or
137Cs), detector array and ring rotation frame and translation tractor etc., enable to provide in real time object and decide the digital radiation projection image of direction along appointing, also the tomography radiation image of object appointed part can be obtained on demand, thereby Device Testing sensitivity and degree of accuracy can be significantly improved.
Existing is that radiogenic container (large object) radiation imageable pick-up unit is (as French Shi Lunbeixie company, German Heyman company, British Aerospace PLC, U.S. EG﹠amp with electron accelerator, radioactive isotope or X-ray production apparatus; Beijing Hua Li of G company and China makes the science and technology prosperous the product information of Development Co., Ltd etc. and United States Patent (USP) 4785168 with described in the Chinese patent application book 96102080.6 and 98101501.8) can satisfy the detection requirement of customs substantially, but exist some defectives:
One, above-mentioned various devices all can only provide the tomographic projection image of one of tested object or two fixed-directions (level, vertical).In a single day device builds up, projecting direction and projection number (1 or 2) all no longer can change.
Its two, when needs provide the projection image of two directions, two cover radiographic source, detector and infosystems etc. just must be set, can cause equipment cost to increase considerably.
Its three, tomographic projection image can only be provided and can't obtain the cross-sectional image of object.
Above-mentioned defective has quite seriously limited the checking ability of radiation imageable pick-up unit for complicated object.For example, complicated and when carrying drugs secretly when the container loading, or in checking large-scale guided missile, during solid-fuelled inherent vice, all need pick-up unit badly and can possess the ability of obtaining cross-sectional image and Ren Ding direction projection image, detect quality and be significantly improved thereby make.
The objective of the invention is to for overcoming the weak point of existing container (large object) detection technique, provide a kind of can obtain easily to appoint decide the projection image of direction and the cross-sectional image of appointed part, and still only adopt one to overlap large object digital radiation imaging the cannot-harm-detection device of radiographic source, detector and infosystem, thereby can significantly improve Device Testing sensitivity and degree of accuracy.
A kind of digital radiation image forming type apparatus for investigating lorge guest materials that the present invention proposes, it comprises high specific activity gamma activity isotope radiographic source and cask flask, exposure cell, collimating apparatus, detector array, translation tractor and signal processing system; It is characterized in that, also comprise ring rotation scanning gantry and support thereof, the said exploring block that is made of band cask flask high specific activity gamma activity isotope radiographic source, exposure cell, collimating apparatus and detector array etc. is installed on this ring rotation frame, synchronously does the rotation sweep motion or be positioned certain to set the orientation; Translation tractor makes object do at the uniform velocity rectilinear scanning campaign or be positioned assigned address along the axis direction of ring-like frame.Be positioned by the ring rotation frame to make object do at the uniform velocity rectilinear scanning campaign by translation tractor and obtain the tomographic projection image of object under certain situation of specifying the orientation at exploring block along this direction.In translation tractor the object appointed part is under the situation in the radiation exposure district, the radial faults image that makes exploring block move and obtain this position of object by the ring rotation frame as rotation sweep.
The used radiographic source of the present invention is only several millimeters a high specific activity of dimension
60Co or
137The Cs radiation isotope.Obtained cobalt-60 defectoscope of widespread use in industrial nondestructive examination industry, its activity is first-selected object less than 24TBq.Used detector array is rearranged according to the order of sequence by a plurality of detector array unit that comprise some detectors unit, and this detector array unit is a kind of of hyperbar inflation array for ionization chamber, multiwire proportional chamber, geiger's tube array, scintillation array detector or semiconductor array detector etc.The rear portion of this detector array has the shield (claiming ray " drip catcher ") that is used for absorbing the ray that passes detector.
Ring rotation frame of the present invention is taked the drive unit of stepping or continuous two kinds of rotary movements, makes exploring block do the rotation sweep motion, to adapt to the needs of different image processing patterns.The internal diameter of this ring rotation frame is should be enough big and large objects such as container are inclusive among the fan ray irradiation field all the time.
Translation tractor of the present invention can adopt a kind of of the electronic wooden handcart, roll shaft formula travelling belt, belt-type transport tape or the chain-plate type transmitting device that travel in orbit, does the translation scan motion in order to drag object.
Describe particular content of the present invention in detail below in conjunction with accompanying drawing:
Referring to Fig. 1, " exploring block " of pick-up unit of the present invention is by high specific activity
60Co or
137Cs gamma activity isotope source and container thereof (band shielding valve) 1, exposure cell and preceding collimating apparatus 2, back collimating apparatus 3 and detector array 4 are formed.They are consolidated mutually, and can rotate synchronously on the ring-like rotary frame 5 of pick-up unit, can revolve to move to be positioned at certain appointment orientation, also can do 360 ° rotation sweep motion.The rear portion of detector array 4 has the shield (claiming ray " drip catcher ") that is used for absorbing the ray that passes detector.The ring rotation frame 5 and support 6 Joints of this pick-up unit, this support 6 then is placed in giving on the embedded part in the ground securely.Tested object 7 (container or large-scale guided missile etc.) places on the translation tractor 8, can do the uniform translation scanning motion by command speed along ring rotation frame axis direction, or move and stop finishing the rotation sweep motion by ring rotation frame 5 to a certain assigned address.Tractor 8 can be the electronic wooden handcart that travels in orbit as shown in the figure, also can be roll shaft formula travelling belt or other transport sector.
When detecting, the shielding valve of opening on the gamma ray source container 1 penetrates and is collimated into arrow gauge shape fan type bundle by gamma-rays by the slit on exposure cell and the preceding collimating apparatus 2.This sheet beam is injected and is aimed in the detector array 4 well by back collimating apparatus 3 (in order to remove scattered ray) again after passing object 7." drip catcher " that the major part that is not detected the ray that device absorbs will be detected device 4 rear portions stops and unlikely to producing deleterious effect on every side.
When needs obtain object along the tomographic projection of certain direction image, revolve to move and be positioned corresponding orientation shilling " exploring block " (forming by 1,2,3,4 etc.), make object 7 at the uniform velocity by arrow gauge shape radiation exposure district by tractor 8 then, and the while acquisition process is by the signal of detector array output.Make " exploring block " to be positioned different orientation, just can obtain the tomographic projection image of the corresponding different directions of object.In Fig. 3, Fig. 4, Fig. 5 and Fig. 6, provided " exploring block " pick-up unit constitutional diagram when being in different azimuth.
When needs obtain the radial faults image at a certain position of object, Schilling tractor 8 moves the need inspection position of object and is placed in the arrow gauge shape radiation exposure district, make " exploring block " on ring rotation frame 5, to do 360 ° of rotation sweep motions then, and gather simultaneously and the output signal of handling detector array 4, just can obtain the radial faults image of this position object.The signal processing system of finishing above-mentioned functions is a routine techniques, does not repeat them here.The present invention is in the process of obtaining the tomography radiation image, and large object keeps transfixion, does the rotation sweep motion by " exploring block ".This large object that is difficult to rotate for container or strategic missile etc. is very favourable.
Source container and shielding valve 1 and exposure cell and preceding collimating apparatus 2 are made by metal such as depleted uranium, lead, iron or its alloy.The gamma-rays that the collimating slit of preceding collimating apparatus is sent radioactive source 1 is collimated into arrow gauge shape as shown in Figure 1, it is being 0.1 ° to 1.0 ° perpendicular to the subtended angle on the direction on ring rotation frame plane, then is not more than 90 ° at the subtended angle of ring rotation frame in-plane.
Back collimating apparatus 3 is made by metal such as lead, iron or its alloy, and width of collimating slit is equal to or slightly less than the pixel width of detector array 4 in the middle of it, and the collimating slit of collimating apparatus 2 and the active region of radiographic source 1 before aiming at.Back collimating apparatus is the same with detector array, and can all make with the radiographic source active region is the camber in the center of circle, and its arc length will guarantee can contain object fully by the irradiation field that it and detector array are limited.Certainly, it also is feasible making straight line or polyline shaped.
Detector array 4 is rearranged by some detector array sequence of unit that comprise some pixel detectors unit, and also constituting with the radiographic source active region is the camber device (or be in line, polyline shaped) in the center of circle.The installation of radiographic source 1, preceding collimating apparatus 2, back collimating apparatus 3 and detector array 4 will make the gamma-rays after collimated inject exactly in the sensitive volume of each pixel detector unit.
The effect of detector array 4 is to convert electric signal to passing the gamma-rays of injecting in its sensitive volume behind the tested object.Require its detection efficiency and highly sensitive, reliable and stable, and the vibrations can finely bear exploring block and do the rotation sweep motion time are disturbed.The first-selected detector array that can satisfy this requirement is " gas-ionization high energy X, the γ radiation imageable array detecting device " that Chinese patent ZL93102728.4 is set forth.Other detector array as multiwire proportional chamber, proportional counter or Geiger pipe array, scintillation detector array or semiconductor detector array etc., also is to adopt object.
The output signal of detector array obtains the digital radiation projection image or the digital radiation cross-sectional image of object by Computer Processing after amplification, analog to digital conversion and collection, check for the person in charge, and can store, print, transmit, filing etc.
One of outstanding advantage of the present invention is in obtaining the process of cross-sectional image, and object keeps transfixion and does the rotation sweep motion by " exploring block ".This, is very important as container and large-scale guided missile for the object that should not overturn.
Another outstanding advantage of the present invention is to have adopted the radioactive isotope radiographic source, and it does not need the power supply supply, does not follow hazards such as high voltage, strong microwave, and can continuously automatically launch gamma-rays.This radiographic source can be installed in easily on the ring rotation frame and rotate in company with exploring block.This is to quicken the type detection system to be difficult to realize.
The present invention is applicable to the Non-Destructive Testing of large objects (comprising container, container carrier, lorry, guided missile or railway car) such as container and guided missile.A kind of application scenario is to detect air container or collection loading bag in the airport, gets rid of explosives, inflammable items, guarantees flight safety.Decide the projection image of direction and the cross-sectional image of appointed part owing to can obtain to appoint, very help finding and judging suspicious object.Another kind of application scenario is a defective of checking huge guided missile internal solids fuel.For finding the cross-sectional image that this class defective must obtain its each position.But, because this type of guided missile is bulky, very heavy, is not suitable for rotation and moves, thereby adopt object when checking motionless and to obtain its cross-sectional image by apparatus of the present invention that exploring block is done the rotation sweep motion be best choice.
Brief Description Of Drawings:
Fig. 1 is the shaft side figure of digital radiation image forming type apparatus for investigating lorge guest materials of the present invention.
Fig. 2 is the side view of digital radiation image forming type apparatus for investigating lorge guest materials of the present invention.
Constitutional diagram when Fig. 3 is in vertical direction for the exploring block of pick-up unit of the present invention.
Constitutional diagram when Fig. 4 is in horizontal direction for the exploring block of pick-up unit of the present invention.
Fig. 5 is in+constitutional diagram during 45 ° of directions for the exploring block of pick-up unit of the present invention.
Constitutional diagram when Fig. 6 is in-45 ° of directions for the exploring block of pick-up unit of the present invention.
The present invention designs a kind of pick-up unit embodiment that is applicable to container, in conjunction with the accompanying drawings, is described in detail as follows:
The general structure of present embodiment as shown in Figure 1.The large object digital radiation imaging detection system of present embodiment (being called for short " detection system ") is by being installed on the ring rotation frame 5
60Co radiographic source and container thereof and shielding valve 1, exposure cell and preceding collimating apparatus 2, back collimating apparatus 3, detector array and drip catcher 4 and compositions such as support 6, track wooden handcart type tractor 8 and signal acquiring processing system.Radiographic source select for use the approved product of market supply-
60Co defectoscope, activity are 300 Curie (11TBq), carry the cask flask that meets the relevant safety standard of International Atomic Energy Agency.Exposure cell and preceding collimating apparatus are all made with plumbous.Back collimating apparatus iron.Detector array is selected the described sniffer of Chinese patent ZL93102728.4 for use, and the sectional dimension of pixel ionization chamber unit is 1 * 1 centimetre, and totally 512 the tunnel.The radiographic source active region is of a size of the right cylinder of diameter 6mm length 6mm, and its center to the distance of detector array front surface is 6m.The diameter of bore of ring rotation frame 5 is 5.5m, and external diameter is 8m.Exploring block can be made step-by-step movement (for example each degree is calculated a step) and rotatablely move on the ring rotation frame, or does rotatablely moving of continuously and smoothly.The load-carrying of track wooden handcart type tractor 8 can reach 40 tons, and linear uniform motion speed is 5～40 cels.This pick-up unit is applicable to detection width and highly is also to can be used to detect the guided missile that diameter is not more than 3m by the TEU (Twenty-foot Equivalent Unit) of 2.5m.
Obtaining when appointing the tomographic projection image decide direction, this device can be found the iron wire of diameter 2.5mm or the iron plate of thickness 0.7mm after 100mm iron plate, and can still observe weight absorber such as lead after 240mm iron plate.When obtaining cross-sectional image, the shape of detection index and object, size, material, structure etc. are closely related, estimate to find the defective of millimeter or submillimeter level.
Claims (7)
1. the digital radiation imaging pick-up unit of large objects such as container, comprise high specific activity gamma activity isotope radiographic source and cask flask thereof, exposure cell, collimating apparatus, detector array, translation tractor and signal processing system etc., its architectural feature is: comprise that also ring rotation scanning gantry and support thereof, the exploring block that is made of said radiographic source and cask flask, exposure cell, collimating apparatus and detector array are installed on the said ring rotation frame, synchronously do the rotation sweep motion or be positioned certain to set the orientation; This translation tractor makes object do at the uniform velocity rectilinear scanning campaign or be positioned assigned address along the axis direction of ring-like frame; Said radiographic source is only several millimeters a high specific activity of dimension
60Co or
137The Cs radiation isotope, the rear portion of this detector array has the shield that is used for absorbing the ray that passes detector.
2. pick-up unit as claimed in claim 1 is characterized in that, used high specific activity
60The Co radiographic source adopts cobalt-60 defectoscope, and its activity is no more than 24TBq.
3. pick-up unit as claimed in claim 1, it is characterized in that, described detector array is rearranged according to the order of sequence by a plurality of detector array unit that comprise some detectors unit, and this detector array unit is a kind of of hyperbar inflation array for ionization chamber, multiwire proportional chamber, geiger's tube array, scintillation array detector or semiconductor array detector.
4. pick-up unit as claimed in claim 1 is characterized in that, said back collimating apparatus is the same with detector array, and making with the radiographic source active region is the camber in the center of circle, and its arc length will guarantee can contain object fully by the irradiation field that it and detector array are limited.
5. pick-up unit as claimed in claim 1 is characterized in that, said ring rotation frame adopts the drive unit of stepping or continuous dual mode.
6. pick-up unit as claimed in claim 1 is characterized in that, translation tractor is a kind of of the electronic wooden handcart, roll shaft formula travelling belt, belt-type transport tape or the chain-plate type transmitting device that travel in orbit.
7. pick-up unit according to claim 1, it is characterized in that being used for tested object is container, container carrier, lorry, guided missile or railway car.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99110839A CN1112583C (en) | 1999-07-23 | 1999-07-23 | Digital radiation image forming type apparatus for investigating lorge guest materials |
| AU55195/00A AU5519500A (en) | 1999-07-23 | 2000-06-30 | A digital radiation photographic detection system for large object |
| PCT/CN2000/000186 WO2001007900A1 (en) | 1999-07-23 | 2000-06-30 | A digital radiation photographic detection system for large object |
| GB0203816A GB2368764B (en) | 1999-07-23 | 2000-06-30 | Digital radiography inspection apparatus for large object |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99110839A CN1112583C (en) | 1999-07-23 | 1999-07-23 | Digital radiation image forming type apparatus for investigating lorge guest materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1242519A CN1242519A (en) | 2000-01-26 |
| CN1112583C true CN1112583C (en) | 2003-06-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99110839A Expired - Lifetime CN1112583C (en) | 1999-07-23 | 1999-07-23 | Digital radiation image forming type apparatus for investigating lorge guest materials |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1112583C (en) |
| AU (1) | AU5519500A (en) |
| GB (1) | GB2368764B (en) |
| WO (1) | WO2001007900A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1786818B (en) * | 2004-12-09 | 2011-06-08 | Ge医疗系统环球技术有限公司 | X Ray radiator and X ray imaging apparatus |
| WO2012040930A1 (en) * | 2010-09-30 | 2012-04-05 | 上海英迈吉东影图像设备有限公司 | Point-by-point scanning device and method uesd in x ray imaging |
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| US7424094B2 (en) | 2003-06-27 | 2008-09-09 | Tsinghua University | Gamma radiation imaging system for non-destructive inspection of the luggage |
| RO121293B1 (en) | 2004-09-30 | 2007-02-28 | Mb Telecom Ltd. - S.R.L. | Non-intrusive control system and method |
| CN100460852C (en) * | 2005-09-22 | 2009-02-11 | 同方威视技术股份有限公司 | Apparatus for conducting CT safety inspection to liquid article using ray source |
| CN100541187C (en) * | 2004-11-26 | 2009-09-16 | 同方威视技术股份有限公司 | But a kind of container check system of CT tomoscan |
| WO2007071890A1 (en) * | 2005-12-22 | 2007-06-28 | Eg & G Middle East | Container inspection system |
| US7356116B2 (en) | 2004-12-03 | 2008-04-08 | Eg&G Middle East | Container inspection system |
| CN1916611A (en) * | 2006-09-08 | 2007-02-21 | 清华大学 | Mulriple DR/CT detection apparatus for containers |
| CN101162205B (en) | 2006-10-13 | 2010-09-01 | 同方威视技术股份有限公司 | Equipment for checking movable target and preventing collision method |
| CN101470082B (en) * | 2007-12-27 | 2011-03-30 | 同方威视技术股份有限公司 | Article detection apparatus and detection method thereof |
| MX2014002728A (en) | 2011-09-07 | 2014-08-22 | Rapiscan Systems Inc | X-ray inspection system that integrates manifest data with imaging/detection processing. |
| CN102768219B (en) * | 2012-07-26 | 2014-07-30 | 清华大学 | Combined nondestructive testing method and combined nondestructive testing system |
| CN103091699A (en) * | 2012-12-29 | 2013-05-08 | 西北核技术研究所 | Device and method for measuring strong gamma ray energy spectrum using scattering method |
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| CN105784737B (en) * | 2016-03-29 | 2021-06-22 | 清华大学 | Container CT inspection system |
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-
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- 2000-06-30 GB GB0203816A patent/GB2368764B/en not_active Expired - Lifetime
- 2000-06-30 WO PCT/CN2000/000186 patent/WO2001007900A1/en active Application Filing
- 2000-06-30 AU AU55195/00A patent/AU5519500A/en not_active Abandoned
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1786818B (en) * | 2004-12-09 | 2011-06-08 | Ge医疗系统环球技术有限公司 | X Ray radiator and X ray imaging apparatus |
| WO2012040930A1 (en) * | 2010-09-30 | 2012-04-05 | 上海英迈吉东影图像设备有限公司 | Point-by-point scanning device and method uesd in x ray imaging |
| CN103649734A (en) * | 2010-09-30 | 2014-03-19 | 上海英迈吉东影图像设备有限公司 | Point-by-point scanning device and method uesd in X ray imaging |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001007900A1 (en) | 2001-02-01 |
| GB0203816D0 (en) | 2002-04-03 |
| CN1242519A (en) | 2000-01-26 |
| AU5519500A (en) | 2001-02-13 |
| GB2368764B (en) | 2004-02-18 |
| GB2368764A (en) | 2002-05-08 |
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