CN1916611A - Mulriple DR/CT detection apparatus for containers - Google Patents
Mulriple DR/CT detection apparatus for containers Download PDFInfo
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- CN1916611A CN1916611A CNA2006101130296A CN200610113029A CN1916611A CN 1916611 A CN1916611 A CN 1916611A CN A2006101130296 A CNA2006101130296 A CN A2006101130296A CN 200610113029 A CN200610113029 A CN 200610113029A CN 1916611 A CN1916611 A CN 1916611A
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- 238000002594 fluoroscopy Methods 0.000 claims description 23
- GUTLYIVDDKVIGB-OUBTZVSYSA-N Cobalt-60 Chemical compound [60Co] GUTLYIVDDKVIGB-OUBTZVSYSA-N 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 14
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
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- 230000004888 barrier function Effects 0.000 description 3
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
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- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
- G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
- G01V5/226—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays using tomography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
- G01T1/2914—Measurement of spatial distribution of radiation
- G01T1/2985—In depth localisation, e.g. using positron emitters; Tomographic imaging (longitudinal and transverse section imaging; apparatus for radiation diagnosis sequentially in different planes, steroscopic radiation diagnosis)
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- High Energy & Nuclear Physics (AREA)
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- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
A multiple DR/CT detection device of container is prepared as arranging at least two body frames with detecting components along translation and drag mechanism, setting body frame to be rotary mode enabling to obtain fault image of object or to be fixed mode enabling to obtain projecting perspective image on certain orientation or to be mixed mode enabling to carry out both said functions.
Description
Technical field:
The multiple DR/CT pick-up unit of container belongs to the Application of Nuclear Technology field, particularly the digital radiation imaging detection technique of large objects such as container, automobile or guided missile.
Background technology:
With electron accelerator, radioactive isotope or X-ray machine are that radiogenic container (large object) radiant image pick-up unit is (as French Shi Lunbeixie company, Germany Heyman company, Beijing Hua Li of British Aerospace PLC and China makes the science and technology prosperous described in the product information and United States Patent (USP) 4785168 and Chinese patent 96102080.6 and 98101501.8 instructionss of Development Co., Ltd etc.) can satisfy the detection requirement of customs substantially, but exist some defectives, for example: the tomographic projection fluoroscopy images that can only provide one or two fixed-direction of tested object, and in a single day device builds up, projecting direction and projection number (1 or 2) all no longer can change; The tomographic projection fluoroscopy images can only be provided and the faultage image of object can't be obtain.
The Chinese invention patent ZL99110839.6 that has authorized proposed application of radiation isotope radiation source (
60Co or
137Cs) container DR/CT pick-up unit, comprise an annular framework that can rotate or be fixed in a certain orientation, can obtain projection perspective (DR) image of the optional direction of object and tomography (CT) image of appointed part, and still only adopt cover radiographic source, detector and an infosystem.This device provides important evidence by the corresponding relation of gray scale on the faultage image and material density for differentiating the object material.
But, because the described device of above-mentioned patent (ZL99110839.6) only comprises one in order to the annular framework of radiographic source and detector array to be installed, as the projection fluoroscopy images that will obtain a plurality of orientation of object or the faultage image at certain several position, just must allow object translation and make annular framework repeatedly change the orientation or repeat to rotatablely move repeatedly.So just obviously reduced quantity---the detection efficiency (percent of pass) that can detect object in the pick-up unit unit interval.In the huge occasion of logistics capacity, this kind situation obviously is undesirable.
Goal of the invention:
The objective of the invention is to overcome the deficiency of the described container DR/CT of Chinese patent (ZL99110839.6) pick-up unit, a kind of container (large object) pick-up unit is proposed, its multiple by setting up (layer) rotary or fixed frame and can provide the digital radiation projection fluoroscopy images of object simultaneously along a plurality of preferential directions, also the tomography radiation image at position, object many places be can obtain on demand simultaneously, thereby Device Testing ability and detection efficiency (percent of pass) significantly improved.
The present invention contains organic frame, be installed in the exploring block on the described frame, described exploring block contains radiographic source, cask flask, exposure cell, shielding valve, collimating apparatus, detector array, also contain translation tractor and signal processing system, it is characterized in that the described frame that exploring block is installed has at least two, arrange along translation tractor.
Described frame is rotatable or the orientation that is positioned to set, is used to obtain the object faultage image or along the rotary support of the projection fluoroscopy images of setting the orientation; Maybe can only be positioned a certain orientation, obtain the fixed frame of the projection fluoroscopy images in this orientation; Maybe can be positioned the semi-stationary frame in certain several orientation; Or the combination in any of described rotary support, fixed frame, semi-stationary frame.
The number of described frame is 2～9.
Radiographic source in the exploring block on the described frame is a high specific activity
60Co,
137Cs,
192Ir or
75The Se radioactive isotope, its activity is not more than 24TBq.
Radiographic source in the exploring block on the described frame is an x-ray source.
Described x-ray source can be an X-ray machine.
Described x-ray source can the electron accelerator x-ray source, sets gradually expansion device and filtrator before this radiographic source exit end.
Described detector array is made up of a plurality of detector array unit cell arrangement that include pixel detector unit, and described detector array unit is hyperbar inflation array for ionization chamber, multiwire proportional chamber, geiger's tube array, scintillation array detector or semiconductor array detector.The Pixel Dimensions of the pixel detector unit of described detector array is in the 2mm-40mm scope, and the cross section is square, rectangle or circle.The ray drip catcher is set at the rear of detector array absorbs radiation after passing detector.
Evidence, the pick-up unit that the present invention proposes has very high detection efficiency, can carry out the Non-Destructive Testing of large objects such as container, automobile, package and guided missile, can also be applied to the detection of air container, collection loading bag, can effectively get rid of explosives, inflammable items, guarantee flight safety, thereby realize bigger inspection usefulness.
Description of drawings:
Fig. 1 is the shaft side figure of container dicyclo DR/CT pick-up unit.
Fig. 2 is the side direction view of container dicyclo DR/CT pick-up unit.
When Fig. 3 is in two exploring blocks on the annular framework and is positioned vertical direction respectively for container dicyclo DR/CT pick-up unit and the constitutional diagram during horizontal direction.
Embodiment:
The principal feature of the pick-up unit that the present invention proposes is that it contains the frame (considering from factors such as costs, proper below 10) that (contains 2) more than 2, is installed with detection part on the frame.Described frame is to do 180 °～360 ° rotations, is used to obtain the object faultage image, and the also orientation that can be positioned to set is used to obtain the rotary support of the projection fluoroscopy images of object different parts; Maybe can only be positioned a certain orientation, obtain the fixed frame of the projection fluoroscopy images in this orientation; Maybe can only be positioned certain several orientation but do not possess the semi-stationary frame of continuous spinfunction; Or the combination in any of described three kinds of frames.Pick-up unit also comprises driving mechanism, container (object) translation tractor, signals collecting and processing subsystem, the equipment operation control subsystem of rotary support or semi-stationary frame, the conventional auxiliary equipment of other needs, as shooting, fire hazard monitoring and safety interlocking etc.
When detecting, translation tractor makes object do at the uniform velocity rectilinear scanning campaign or be positioned certain assigned address along the axis direction of frame.When translation tractor makes object make linear uniform motion, fixed frame or be fixed in rotary support or the exploring block on the semi-stationary frame of setting the orientation and can obtain the tomographic projection fluoroscopy images (DR image) of object according to the direction of its location along this direction.When some appointed part of object was positioned in the radiation exposure district of rotary support, rotary support was rotated scanning motion, and exploring block obtains the radial faults image (CT image) at these positions with the frame rotation sweep.The user can take all factors into consideration according to needs and cost factor, determines the quantity and the kind of frame then, rationally arranges it to put in order and orientation, thereby obtains the faultage image of different azimuth projection fluoroscopy images and object zones of different.
Rotary support
Rotary support can be done 180 °～360 ° rotations, is used to obtain the object faultage image, and the also orientation that can be positioned to set is used to obtain the projection fluoroscopy images of object different parts.Its exploring block comprises gamma activity isotope radiographic source and cask flask, exposure cell, shielding valve, collimating apparatus, detector array and front-end circuit and ray drip catcher etc.; Radiographic source is only several millimeters a high specific activity of dimension
60Co,
137Cs,
192Ir or
75The Se radioactive isotope.Obtained the cobalt-60 flaw detection source of widespread use in industrial nondestructive examination industry, its activity is first-selected object less than 24TBq, is particularly useful for the detection of large object, helps improving pick-up unit reliability of operation of the present invention.Rotary support generally is the ring rotation frame, its internal diameter should be enough big and make large object such as container be easy to by and can be inclusive within the fan-shaped radiation exposure open country.Radiographic source can also adopt x-ray source, as X-ray machine or accelerator, what X-ray machine or accelerator sent is the X ray of the continuum of different ceiling capacities, except that different aspect the radiation source parts, when adopting the accelerator source " expansion device " that improves the ray spatial distribution state and " filtrator " that improves X-ray energy spectrum need be set, this type of " expansion device " reach " filtrator " all be utilize material to the absorption of ray and high atomic number material to the low energy ray principle of strong absorption more, be the absorber that adopts certain material and shape.The structure of others is constant substantially.
Used detector array is rearranged according to the order of sequence by a plurality of detector array unit that comprise some pixel detectors unit, and array for ionization chamber, multiwire proportional chamber, geiger's tube array, scintillation array detector (as cesium iodide or cadmium tungstate twinkling crystal+photoelectron diode array detector) or semiconductor array detector etc. can be inflated for hyperbar in this detector array unit.
The translation tractor of pick-up unit is electronic wooden handcart, roll shaft formula travelling belt, belt-type transport tape or the chain-plate type transmitting device that travels in orbit, does the translation scan motion in order to drag object.Here can adopt various general and tractors maturation, fully use the open knowledge in this technical field.
If frame must have the function of 180 °～360 ° degree rotations, thereby obtain the faultage image of object a part, its shape is generally annular.
Fixed frame
The structure of fixed frame and rotary support is basic identical, and difference is, this can only to be fixed on a certain orientation motionless, therefore can only obtain the tomographic projection fluoroscopy images in an orientation of object.
Semi-stationary frame
Only need be positioned several directions, thereby obtain the tomographic projection fluoroscopy images in certain several orientation, then frame can be simplified to " Г " shape, " ∏ " shape or other form.It can be changed on several orientation, but does not possess continuous spinfunction.
Further illustrate below in conjunction with accompanying drawing.
Shown in 1～3, be to be example with the pick-up unit that adopts two annular frameworks, two annular frameworks are respectively 5 and 5 ', are fixed with exploring block on frame 5, by high specific activity
60Co,
137Cs,
192Ir or
75Se gamma activity isotope radiation source and container thereof (band shielding valve) 1, exposure cell and preceding collimating apparatus 2, back collimating apparatus 3 and detector array 4 and the compositions such as front-end circuit that match.They interfix respectively on annular framework 5, can rotate synchronously with frame.Detector array 4 rear portions have the shield (claiming ray " drip catcher ") that is used for absorbing the ray that passes detector, and this is the absorbing material piece of strip, generally makes with heavy metal material, and the absorption of ray is decided on its thickness and material.Certainly, also can help or replacement by constructing barrier shield or other protective equipment " drip catcher " stop radiation that personnel or external environment condition are produced deleterious effect.The ring rotation frame 5 of pick-up unit is by large size bearing and support 6 Joints, and this support 6 then is placed on the built-in fitting in the ground (base part that is embedded among the figure in the ground dots) securely.
Annular framework 5 ' and detection part etc. thereof are identical with frame 5, arrange before and after the two.Tested object 7 (large object such as container etc.) places on the translation tractor 8, can do the uniform translation scanning motion by command speed along ring rotation frame axis direction, or be moved and stop finishing the rotation sweep running by ring rotation frame 5 or 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 that roll shaft formula travelling belt, belt-type transport tape, chain-plate type transmitting device or other ripe general routine drag equipment.
When detecting, the shielding valve of opening on the gamma ray source container (1 and 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 and 2 ').This sheet beam is injected and is aimed in the good detector array (4 and 4 ') by back collimating apparatus 3 and 3 ' (in order to remove scattered ray) again after passing object 7.The ray " drip catcher " that the major part that is not detected the ray that device absorbs will be detected the device rear portion stops and unlikely to producing deleterious effect on every side.Perhaps, also can help or replacement by constructing barrier shield or other protective equipment " drip catcher " stop radiation that personnel or external environment condition are produced deleterious effect.Rotary support is the ring rotation frame, its internal diameter should be enough big and make large object such as container be easy to by and can be inclusive within the fan-shaped radiation exposure open country.
Radiographic source is only several millimeters a high specific activity of dimension
60Co,
137Cs,
192Ir or
75The Se radioactive isotope.Obtained the cobalt-60 flaw detection source of widespread use in industrial nondestructive examination industry, its activity is first-selected object less than 24TBq, is particularly useful for the detection of large object, helps improving pick-up unit reliability of operation of the present invention.
137The radiogenic energy of of Cs is 660keV, only reaches
60Half of Co energy of, corresponding penetrating power is also much lower, but its long half time (33 years) is so use wants the time limit much longer.
192Ir or
75The gamma-ray average energy of Se is about 300keV, mainly is applicable to light, small-sized object, and their half life period is short more a lot of than 60Co, but also considerably cheaper of price.
Radiation source also can select for use X-ray machine maybe can produce the miniature electric accelerator of higher-energy X ray, the X ray energy that X-ray machine sends is lower, even its ceiling capacity reaches about 400keV, penetrating power when detecting object also has only tens of millimeters iron, thereby mainly is applicable to middle-size and small-size and light-duty object.Electron accelerator can produce the X ray of higher-energy, and ceiling capacity can reach 9MeV or higher, thereby can realize ratio
60The penetrating power that the Co gamma-rays is higher is suitable for detecting large-scale and heavy object.But general accelerator structure complexity has high-voltage power supply, field coil and microwave generator etc. again, realize having bigger difficulty around the operating mode of object rotation.Therefore, small-sized, the special-purpose accelerator that structure is light and solid and reliable that have only that specialized designs makes could realize making it to center on the detecting pattern that object rotates.Because
60The gamma-ray average energy of Co has reached 1.25MeV, thereby it is little to adopt average energy to be lower than its practical significance of accelerator.The penetrating power of institute's development compact accelerator detection system should surpass at least
60Co gamma-rays detection system.Small-sized accelerator around the object rotation like this can use in pick-up unit of the present invention.Because the accelerator facility complexity will make annular framework continuous 360 ° of rotations often have very big difficulty, can adopt the mode of positive and negative rotation sweep.When adopting accelerator as radiographic source, be to overcome spatial non-uniformity of its output X ray and adjust its power spectrum, need to adopt to rely on the absorption thickness that changes to stabilize preshoot direction radiation intensity " the expansion device " and by heavy metal to the effect of low-energy radiation strong absorption " filtrator " (make output X-ray energy spectrum tendency high energy aspect).Can assert after taking all factors into consideration, under present condition, for large object, the radioactive isotope radiation source
60Co or
137Cs is the preferential selection of pick-up unit of the present invention.Under middle-size and small-size or light-duty object situation, can adopt
192Ir or
75Se radioactive isotope radiation source also can use the X-ray machine radiographic source.When requiring higher penetrating power, need to use the accelerator x-ray source that can center on the object rotation of miniaturization.
Gamma ray source container and shielding valve 1 and 1 ' and exposure cell and preceding collimating apparatus 2 and 2 ' make by metal such as depleted uranium, lead, iron or its alloy.Before collimating slit on the collimating apparatus gamma-rays that radioactive source sent is collimated into as shown in Figure 1 arrow gauge shape, 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 120 ° at the subtended angle of ring rotation frame in-plane.Back collimating apparatus 3 and 3 ' is made by metal such as lead, iron or its alloy, and the width of its collimating slit is equal to or slightly less than the pixel wide of detector array 4 and 4 ', and the collimating slit and the radiogenic active region of collimating apparatus 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, as long as can make irradiation field contain object, the back collimating apparatus being made into linearity, polyline shaped or other shape with the strong probe designs of battle array, also is feasible.
Detector array is fitted together with the front-end circuit that matches usually, its output signal is after amplification, analog to digital conversion and collection, obtain the digital radiation projection fluoroscopy images or the digital radiation faultage image of object by Computer Processing, check for the person in charge, and can carry out information processing such as mark, sharpening, storage, printing, transmission and handle.
Two annular frameworks 5 shown in Figure 1 and 5 ' can be two rotary supports, when needs obtain object along the tomographic projection fluoroscopy images of certain direction, the Schilling exploring block revolves to move in company with rotary support and is positioned corresponding orientation, make object 7 at the uniform velocity by sheet radiation exposure district by tractor 8 then, and the while acquisition process is by the signal of detector array output.When making two exploring blocks on the annular framework be positioned different orientation respectively, just can obtain the tomographic projection fluoroscopy images of two different directions of two correspondences of object simultaneously.Pick-up unit constitutional diagram when the exploring block of annular framework is in vertical orientations and level orientation respectively before and after having provided in Fig. 3.When needs obtain the radial faults image at some position of object, the position that Schilling tractor 8 need detect object is moved and is placed in the arrow gauge shape radiation exposure district, make two exploring blocks on the annular framework do 360 ° of rotation sweep motions then in company with frame, and gather simultaneously and the output signal of handling detector array 4 and 4 ', just can obtain the radial faults image of this two positions object simultaneously.The present invention is in the process of obtaining the tomography radiation image, and large object keeps transfixion, and exploring block is done the rotation sweep motion in company with frame.This object that is difficult to rotate for container or large-scale guided missile etc. is very necessary.
In twin nuclei pick-up unit shown in Figure 1, also can make a frame (generally being the front) be fixed frame or semi-stationary frame, make its orientation that is in setting (as horizontal or vertical orientation) obtain the projection fluoroscopy images of object, and another annular framework is a rotary support, and this frame is in the faultage image that the rotation sweep state obtains the object appointed part.Perhaps, allow two frames be fixed on different azimuth (as the vertical and horizontal orientation) earlier, when the container translation is passed through, can obtain the tomographic projection fluoroscopy images that this gets both direction simultaneously, determine to carry out the position that CT detects according to this two width of cloth image again, then make container turn back to correct position, allow one or two annular frameworks do the rotation sweep motion, thereby obtain a certain position or obtain the faultage image at certain two position simultaneously.
If 3 or more a plurality of frame are set in pick-up unit, can set rotation, semifixed or the quantity of fixed frame and their collocation mode as required, make it that more choice arranged aspect the setting of detecting pattern.More frame quantity can guarantee higher detection efficiency (percent of pass), and the selection collocation of various array modes is easy to imagine, and does not need to overcome more technical barriers, thereby repeats no more.Adopt
60Behind the radioactive isotope radiation sources such as Co, significantly reduced " exploring block " manufacturing cost.And for modern manufacturing industry, cost rotary or fixed frame is not high yet.Therefore, increase a suite of racks and match " exploring block " cost that increased and not really high is an acceptable for pressing for the occasion that improves detection efficiency (percent of pass).Certainly, too much frame quantity is uneconomic, generally adopt 10 more suitable with following formula, promptly frame adds up to 2,3,4,5,6,7,8 or 9.
Outstanding advantage of the present invention is multiple (layer) frame by being provided with and appropriate matched combined between them, and significantly (exponentially) improved the detection efficiency (percent of pass) of pick-up unit, thus the bigger inspection usefulness of performance.Its another advantage is that no matter adopt the radiation source of what type, in obtaining the process of faultage image, object all 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.
The present invention is applicable to the Non-Destructive Testing of large objects such as container, automobile, package 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 fluoroscopy images of direction and the faultage image of appointed part owing to can obtain to appoint, very help finding and judging suspicious object.Owing to adopt multiple (layer) design, improved detection efficiency (percent of pass) greatly, even the airport heavy traffic also can satisfy the demands.
A kind of application scenario is the local vehicular traffic of checking in customs, important department or mass-meeting gateway etc., provides more effective detection means for preventing the attack of terrorism.
Another possible application scenario is a defective of checking large-scale guided missile internal solids fuel, guarantees launch mass.
Two specific embodiments of the present invention are provided below:
Embodiment 1:
The present invention designs a kind of air container of being applicable to
60Co dual (layer) DR/CT pick-up unit embodiment 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 of present embodiment dual (layer) DR/CT radiation image-forming detecting system (being called for short " detection system ") is by being installed on ring rotation frame 5 and 5 '
60Co radiographic source and container thereof and shielding valve 1 and 1 ', exposure cell and preceding collimating apparatus 2 and 2 ', back collimating apparatus 3 and 3 ', detector array and drip catcher 4 and 4 ' and compositions such as support 6 and 6 ', track wooden handcart type tractor 8 and signal acquisition process subsystem.Radiographic source is selected the approved product of market supply for use---
60The Co source of detecting a flaw, activity is 100 Curie (3.7TBq).Exposure cell and preceding collimating apparatus are made by tungsten, depleted uranium, lead alloy or other heavy metal respectively.Back collimating apparatus is with iron or lead alloy manufacturing.Detector array is selected Chinese patent ZL93 102728.4 and ZL00 1 21545.0 described sniffers for use, and the sectional dimension of pixel ionization chamber unit is 7 * 7 millimeters, and totally 620 the tunnel.The radiographic source active region is of a size of the right cylinder of diameter 4mm length 4mm, and its center to the distance of detector array front surface is 3.5m.Ring rotation frame 5 and 5 ' diameter of bore are 3m.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.5 tons of roll shaft formula tractor 8 load-carryings, linear uniform motion speed is 6～18cm/sec.With the dragging system intersection, reserve the neutral between roll shaft at the sheet beam, to avoid interference to radiation image.This pick-up unit is applicable to detection width and the standard air container that highly is about 1.6m, also can be used to detect car or diameter less than 2.5 meters column type object.
When obtaining the tomographic projection fluoroscopy images of preferential 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 heavy absorber such as lead after 220mm iron plate.When obtaining faultage image, the shape of detection index and object, size, material, structure etc. are closely related, estimate to find millimetre-sized defective.With the density of water near field mutually, the density resolution of this pick-up unit can reach 1% or better (can distinguish water outlet easily with gasoline or alcohol).
Embodiment 2:
Second kind is applicable to container
60Co dual (layer) DR/CT pick-up unit embodiment is identical with embodiment 1 aspect mainly, but detector array 4 and 4 ' is not " an array gas filled ionization chamber ", but adopts scintillation array detector---cesium iodide (cadmium tungstate) scintillation crystal+photodiode array.Because the detection performance of this kind detector array is similar or slightly poor to " array gas filled ionization chamber ", thereby the overall performance of this kind pick-up unit is also similar or slightly poor to embodiment 1.
Claims (10)
1. the multiple DR/CT pick-up unit of container, contain organic frame, be installed in the exploring block on the described frame, described exploring block contains radiographic source, cask flask, exposure cell, shielding valve, collimating apparatus, detector array also contain translation tractor and signal processing system, it is characterized in that, the described frame that exploring block is installed has at least two, arranges along translation tractor.
2. the multiple DR/CT pick-up unit of container as claimed in claim 1 is characterized in that, described frame is rotatable or the orientation that is positioned to set, is used to obtain the object faultage image or along the rotary support of the projection fluoroscopy images of setting the orientation; Maybe can only be positioned a certain orientation, obtain the fixed frame of the projection fluoroscopy images in this orientation; Maybe can be positioned the semi-stationary frame in certain several orientation; Or the combination in any of described rotary support, fixed frame, semi-stationary frame.
3. the multiple DR/CT pick-up unit of container as claimed in claim 1 or 2 is characterized in that the number of described frame is 2～9.
4. the multiple DR/CT pick-up unit of container as claimed in claim 1 or 2 is characterized in that the radiographic source in the exploring block on the described frame is a high specific activity
60Co,
137Cs,
192Ir or
75The Se radioactive isotope, its activity is not more than 24TBq.
5. the multiple DR/CT pick-up unit of container as claimed in claim 1 or 2 is characterized in that the radiographic source in the exploring block on the described frame is an x-ray source.
6, the multiple DR/CT pick-up unit of container as claimed in claim 5 is characterized in that described x-ray source is an X-ray machine.
7. the multiple DR/CT pick-up unit of container as claimed in claim 5 is characterized in that described radiographic source is the electron accelerator x-ray source, sets gradually expansion device and filtrator before this radiographic source exit end.
8. the multiple DR/CT pick-up unit of container as claimed in claim 1, it is characterized in that, described detector array is made up of a plurality of detector array unit cell arrangement that include pixel detector unit, and described detector array unit is hyperbar inflation array for ionization chamber, multiwire proportional chamber, geiger's tube array, scintillation array detector or semiconductor array detector.
9. the multiple DR/CT pick-up unit of container as claimed in claim 8 is characterized in that, the Pixel Dimensions of the pixel detector unit of described detector array is in the 2mm-40mm scope, and the cross section is square, rectangle or circle.
10. the detected set as claimed in claim 1 multiple DR/CT pick-up unit of casing is characterized in that, the ray drip catcher is set at the rear of detector array absorbs radiation after passing detector.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101130296A CN1916611A (en) | 2006-09-08 | 2006-09-08 | Mulriple DR/CT detection apparatus for containers |
| PCT/CN2007/001954 WO2008031313A1 (en) | 2006-09-08 | 2007-06-21 | Multiple dr/ct detection device of containers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101130296A CN1916611A (en) | 2006-09-08 | 2006-09-08 | Mulriple DR/CT detection apparatus for containers |
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| Publication Number | Publication Date |
|---|---|
| CN1916611A true CN1916611A (en) | 2007-02-21 |
Family
ID=37737642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101130296A Pending CN1916611A (en) | 2006-09-08 | 2006-09-08 | Mulriple DR/CT detection apparatus for containers |
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| Country | Link |
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| CN (1) | CN1916611A (en) |
| WO (1) | WO2008031313A1 (en) |
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| WO2008031313A8 (en) | 2008-06-12 |
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