CN201196635Y - Integration system used for active material detection and X ray radiation imaging - Google Patents
Integration system used for active material detection and X ray radiation imaging Download PDFInfo
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- CN201196635Y CN201196635Y CNU2008200794595U CN200820079459U CN201196635Y CN 201196635 Y CN201196635 Y CN 201196635Y CN U2008200794595 U CNU2008200794595 U CN U2008200794595U CN 200820079459 U CN200820079459 U CN 200820079459U CN 201196635 Y CN201196635 Y CN 201196635Y
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Abstract
The utility model relates to the field of the detection of a radioactive substance and the radiation imaging of X-ray and provides an integrated system for carrying out the detection of the radioactive substance and the radiation imaging of X-ray to a detected object in the same place, which solves the technical problem that two kinds of detection have to be separately carried out in the prior art. The integrated system comprises X-ray detection equipment used for carrying out the detection of X-ray radiation imaging to the detected object, radioactive substance monitoring equipment used for detecting radioactive rays emitted by the detected object and a device for blocking X-ray radiation from reaching the radioactive substance monitoring equipment, The integrated system realizes the compact integration of two kinds of detection, greatly saves space and time resources, avoids the waste of manpower and material resources caused by continuous good transportation between the radioactive substance monitoring equipment and the X-ray detection equipment.
Description
Technical field
The present invention relates in general to article and checks the field, is specifically related to radiomaterial and detects and the X-ray examination field.
Background technology
Radioactive matter monitoring equipment has been widely used in the gateway radioexmination in customs, border, airport, nuclear power plant and other important place, is used to stop the illegal transfer of radiomaterial.Radioactive matter monitoring equipment of the prior art mainly is when utilizing radiomaterial/special nuclear material by equipment, its gamma of launching, neutron ray are detected, the system counts rate that causes according to described gamma, neutron ray changes or the power spectrum ANOMALOUS VARIATIONS, thereby judges whether the tested object that passes through contains radiomaterial/special nuclear material.
Except radioactive matter monitoring, also to carry out X-ray check in the gateway in important place usually to the turnover article.X-ray check equipment of the prior art is to utilize X-ray machine to be radiation source, when passing through checkout equipment, tested object detects the X-ray dosage that sees through object, change mass thickness and the picture information that obtains object according to the dosage that sees through that records, and judge whether to contain dangerous goods in view of the above.
Above-mentioned radioactive matter monitoring equipment and X-ray check equipment can be finished function separately in different inspection fields, but a problem is, above-mentioned radioactive matter monitoring equipment and X-ray check equipment placed adjacent can not be carried out radioactive matter monitoring and X-ray check to a tested object.Its reason is: when tested object was carried out the X-ray radiation imaging inspection, X-ray check equipment can be launched a large amount of X ray, and wherein some X ray can bleed in the radioactive matter monitoring equipment of placed adjacent.Because radioactive matter monitoring equipment is just by judging to the detection of ray whether the tested object that passes through contains radiomaterial, so the X ray that bleeds can influence the accuracy of detection of radioactive matter monitoring equipment, make it can't judge correctly that detected abnormal radiation is because radiomaterial causes or caused by the X ray that bleeds.And then, because can not be with above-mentioned radioactive matter monitoring equipment and X-ray check equipment placed adjacent, so must between radioactive matter monitoring equipment and X-ray check equipment, constantly transport kinds of goods in customs such as airport or harbours, cause the waste on great amount of manpower and material resources, the room and time.
Summary of the invention
Defective in view of having in the prior art as mentioned above is desirable to provide a kind of integrated system, can survey radiomaterial in same place simultaneously and carry out the X-ray radiant image.
The present invention has solved the integrated middle various interference that occur of described radiomaterial detecting devices and X-ray check equipment and the problem of coordinating mutually by rational shielding setting.
According to one embodiment of present invention, provide a kind of system that is used for tested object is carried out radiomaterial detection and X-ray radiant image, this system comprises: X-ray check equipment is used for tested object is carried out the X-ray radiation imaging inspection; Radioactive matter monitoring equipment with described X-ray check equipment placed adjacent, is used to detect the radioactive ray that described tested object sends; And be used to stop that the X-ray radiation arrives the device of described radioactive matter monitoring equipment.
By above technical scheme, realized the compact integrated of X-ray object checkout facility and radioactive matter monitoring equipment, can carry out x radiation x imaging inspection and radioactive matter monitoring in same place, saved the space resources of customs such as airport, harbour greatly, saved the time, and then avoided because in the waste of constantly transporting between radioactive matter monitoring equipment and the X-ray check equipment on the human and material resources that kinds of goods cause.
Description of drawings
Below by in conjunction with the accompanying drawings each embodiment being described in detail, identical Reference numeral is represented identical building block.
Fig. 1 is the side view that is used for the detection of radioactive material according to an embodiment of the invention and object is carried out the system of X-ray examination;
Fig. 2 is being used for the detection of radioactive material and object being carried out the vertical view of the system of X-ray examination as shown in Figure 1;
Fig. 3 is a radioactive matter monitoring equipment when comprising environmental exact details work, the scattering power spectrum that multichannel pulse scope-analyzer (MCA) obtains;
Fig. 4 is the concrete composition frame chart of radioactive matter monitoring equipment.
Embodiment
Fig. 1 is used for the detection of radioactive material and object is carried out the side view of the system 100 of X-ray examination according to one embodiment of the invention, and wherein Reference numeral 101 expression radioactive matter monitoring equipment are used to detect gamma or the neutron ray that tested object sends.102 expression X-ray check equipment are used for tested object is carried out the X-ray radiation imaging inspection.Wherein radioactive matter monitoring equipment 101 places the inlet both sides of X-ray check equipment 102, but those skilled in the art also can expect being placed on the outlet both sides of X-ray check equipment 102, or place a side of inlet or outlet, and be placed on the upper and lower of X-ray check equipment 102.103 expression objective tables are used to carry tested object.104 expression crawler belts are used to transmit tested object and are advanced through X-ray check equipment 102 from the position of accepting radioactive matter monitoring.105 expression pillars are used to support objective table 103.
Fig. 2 is being used for the detection of radioactive material and object is carried out the vertical view of the system of X-ray examination as shown in Figure 1, totally represents with Reference numeral 200.Identical radioactive matter monitoring equipment among Reference numeral 201 expression and Fig. 1 wherein.202 the expression with Fig. 1 in identical X-ray check equipment.203 are illustrated in X ray emission, the process collimation in the X-ray check equipment 202.With X-ray check equipment 102 when checking, this X-ray check equipment is launched X ray continuously, wherein feels at very strong fan-shaped elementary X ray, this fan-shaped elementary X ray is collimated into X ray 203 at collimated device., transmission collimated at it crossed in tested object and the detector testing process, has a large amount of scattered ray and forms, near the accuracy of detection of radiomaterial checkout equipment 201 these scattered ray may influence in the prior art.The plumbous curtain of 204 expressions is used for the described scattered ray of shield portions.The tested object of 205 expressions, and 205 ' expression is in the tested object of accepting the X-ray check position.206 expression parts are surrounded first shield of radioactive matter monitoring equipment 201.207 represent to surround to small part the secondary shielding body of X-ray check equipment 202.
In the embodiment shown in Figure 2, the xsect of X-ray check equipment 202 is a rectangle, and it is surrounded fully by secondary shielding body 207.The radioactive matter monitoring equipment 201 and first shield 206 are placed in a side of the porch of X-ray check equipment 202, described first shield 206 is the shape of a hoof, its arc end surrounds described radioactive matter monitoring equipment 201, the carriage direction precedent such as the miter angle of opening axis and tested object.And two arms of opening portion stretch out from the circular arc position, can not arrive radioactive matter monitoring equipment 201 to guarantee scattered ray that is sent by X-ray check equipment 202 or the X fluorescent x ray that is excited and the scattered ray that leaks out herein when all plumbous curtains 204 are in the nature plumbness.Preferably, described first shield 206 can also shield natural background ray at least in part, to improve system sensitivity.Described opening has guaranteed that also tested object 205 is had enough subtended angles, gamma and neutron ray that the tested object 205 of detection that can be correct sends simultaneously.This subtended angle, or claim the visual field, with the inspection velocity correlation of 202 pairs of article of X-ray check equipment, subtended angle suitably strengthened when speed was fast, and subtended angle can suitably dwindle when speed was slow.Use miter angle as example in the present embodiment, those of ordinary skill in the art also can be easy to expect using other angles certainly, and for example the angle between the 30-60 degree reaches identical technique effect.Equally, those of ordinary skill in the art can be easy to expect the radioactive matter monitoring equipment 201 and first shield 206 are placed the both sides or the upper and lower of X-ray check equipment 202 inlets or outlet, does not influence and guarantees passing unimpeded and not taking outer place of tested goods.As long as first shield 206 can mask the scattering on the plumbous curtain, then any angle and placement location can be realized.The a plurality of radioactive matter monitoring equipment 201 of diverse location, angle and first shields 206 of placing can use simultaneously, as long as it can mask the scattering on the plumbous curtain and enough subtended angles be arranged to be used to detect gamma and the neutron ray that tested object 205 sends.In addition, except the shape of a hoof, first shield 206 can also be realized or any encirclement shape realization with openings at one side with C shape, as polygons such as rectangles.In another embodiment, first shield 206 is implemented as unidirectional baffle, described unidirectional baffle can be placed between described radioactive matter monitoring equipment 201 and the X-ray check equipment 202, is used for unidirectionally blocking described X-ray radiation and arriving described radioactive matter monitoring equipment 201.In a preferred embodiment, first shield 206 is implemented as the unidirectional baffle of yi word pattern.
In a preferred implementation, use heavy metal material to make first shield 206 and secondary shielding body 207, because neutron has good penetrability to heavy metal, therefore constitute first shield 206 and secondary shielding body 207 with heavy metal material, not only can reach good shield effectiveness to X ray, and can make the detection sensitivity of neutron unaffected or influence is very little.
Explain by improving the detection lower bound of amplifier or multiple tracks below in conjunction with Fig. 3, reduce the influence of scattered ray radioactive matter monitoring equipment.When the gamma of radiomaterial emission and/or neutron ray incide radioactive matter monitoring equipment 201, interact with material for detector in the radioactive matter monitoring equipment 201 and be converted into electric impulse signal output; This electric impulse signal zooms into type, data acquisition etc. through linearity, can be noted by counting rate by system, also can be recorded as power spectrum by the signal amplitude size.Fig. 3 is a radioactive matter monitoring equipment 201 when comprising environmental exact details work, the scattering power spectrum that multichannel pulse scope-analyzer (MCA) obtains, and wherein transverse axis is represented number, the longitudinal axis is represented counting.
Fig. 4 specific explanations the concrete composition frame chart of radioactive matter monitoring equipment, this radioactive matter monitoring equipment in Fig. 4 totally with Reference numeral 400 expression.This radioactive matter monitoring equipment 400 mainly comprises: gamma detection module 401, neutron detection module 402, take/speed detector 403, gate detector 404, temperature-controlling module 405, sound and light alarm 406, video monitoring 407, signal transmission and controller 408, computing machine 409, TCP/IP module 410, USP power supply 411.Wherein signal transmission and controller 408, computing machine 409, TCP/IP module 410 be included in data obtain with processing subsystem 412 in.Gamma detection assembly 401 is made up of high-sensitive plastic scintillant/NaI crystal, low-noise photomultiplier, high pressure, amplifier etc., is used to survey gamma ray and its signal is transferred to data and obtain and processing subsystem 412.Neutron detection assembly 402 is formed by optimizing slow body structure, He-3 direct ratio neutron tube, high pressure, amplifier etc., is used to come detected neutron and its signal is transferred to data and obtain and processing subsystem 412.Take/whether speed detector 403 forms by being contained in the correlation infrared sensor that opposition surveys on the post, have checking matter to pass through the monitored area in order to know.Data are obtained with processing subsystem 412 and are formed with counter or multichannel analyzer and senior reduced instruction set processor (ARM) embedded system, in order to collection with deal with data, judge whether to exist radiation meter digit rate or power spectrum unusual and produce relevant warning message.By software relevant data processing and calculating, condition correction, logic determines etc. are formed a cover alarm algorithm, and softwares such as user interface, information leave-on.Gate detector 404, temperature-controlling module 405, sound and light alarm 406, video monitoring 407, signal transmission belong to functional module of the prior art with controller 408, computing machine 409, TCP/IP module 410, USP power supply 411, concisely consider for instructions, do not state its concrete composition is tired one by one at this.Those of ordinary skills are appreciated that also each functional module can increase and decrease according to the actual requirements.
When radiomaterial when the checkout equipment, take place can judge that tested object contains radiomaterial when unusual in the radiation meter digit rate that detects or power spectrum.In order effectively to monitor radiomaterial, radioactive matter monitoring equipment 201 needs according to system's environmental exact details level of living in, determine that counting rate alarm threshold value and/or ray energy spectrum change limit value, to satisfy the requirement of system sensitivity, accuracy, monitoring velocity and false alarm rate.The radiation meter digit rate of systematic survey or the peak area of power spectrum meet the physics statistical law, promptly at a metastable environment, be recorded under the situation of (or relatively small amount) with no electronics noise, the counting rate of known last period or peak area, can predict the counting rate of next period or the probability that area goes out present worth, usually appear at 5 probabilities outside the Sigma much smaller than 0.1%, thereby alarm threshold value is set in 5 Sigmas basically, the rate of false alarm level that meets nearly all standard-required, this threshold value also becomes the sensitivity of this system, when next counting rate or peak area are equal to or greater than the counting rate of previous (or average or take before) or 5 Sigmas, the i.e. output alarms that peak area adds it.Equally, if a radioactive source is arranged, the counting rate that its ray is detected or the true value of its peak area are 5 Sigmas of this moment background counting rate or peak area (corresponding district), and system thresholds is arranged on 5 Sigmas, then press statistical law, the accuracy rate that this source is detected is 50%, also is the requirement of general standard institute; In like manner because of statistical law, factor such as the time of index such as sensitivity and detection and movement of objects speed is relevant.When object to be detected passes through radioactive matter monitoring equipment 201, if radiation meter digit rate that measures or power spectrum intensity of variation are higher than setting value, radioactive matter monitoring equipment 201 output alarm information.According to the ray energy feature (power spectrum) that system detects, can differentiate the classification of radiomaterial and concrete nucleic.Particularly, power spectrum is promptly by the two-dimensional spectrum of the big small records of the ray energy that detects, pass through energy calibration in advance as spectrometer, as using 241Am (characteristic energy 59KeV...), 137Cs (characteristic energy 661.6KeV...), 60Co (characteristic energy 1173.2KeV, 1332.5KeV), the energy of its full energy peak correspondence all is known; Detection to unknown source, as occurring the peak in the power spectrum or obtaining peak position by the mathematics spectrum unscrambling, be converted to energy through calibration factor, the i.e. source nucleic at this peak as can be known, certainly a lot of nucleic have a plurality of characteristic peaks, and the ratio of its branch is fixed, but because of the plain factor such as overlapping of self-absorption, detection efficiency, shielding, interference, multinuclear, the peak area ratio difference that detects can be very big.
Get back to Fig. 3, the grey spectral line of below is the power spectrum of environmental exact details among the figure, mainly is made of the naturally occurring radioactive substance in cosmic rays and the environment.The black spectral line that is positioned on the grey spectral line is when comprising environmental exact details and 202 unleaded curtain shieldings of X-ray check equipment and work, radioactive matter monitoring equipment 201 detected power spectrums.In the black power spectrum, at low road number, promptly low-yield district demonstrates very high counting rate.This is because described scattered ray has lost big energy after the scattering of process one or many in X-ray check equipment 202, so its energy mainly concentrates on the low energy district.And tested object is when containing radiomaterial, and its ray energy can be higher than the low energy district shown in the figure usually.That is to say that the ray energy that tested object sends is in the different energy range with the X-ray scattered ray.
According to one embodiment of present invention, the flex point from high count rate to steadily low counting rate is provided with and detects lower bound (LLD) at the black spectrum curve.Detecting lower bound dynamically arranges flexibly by the requirement and the sensitivity index of digital circuit according to concrete detector ray energy scope.According to the energy limit of determining, can determine to detect lower bound.Particularly, through the power spectrum of scale, energy is corresponding with the road number, has definite energy limit promptly to have and determines to detect lower bound.In general standard, detection sensitivity to homology not requires different, and sensitivity is relevant with the counting rate or the corresponding interval area of background, thereby for satisfying the sensitivity requirement of respective sources, can adjust the detection lower bound targetedly, as the characteristic peak of 60Co more than 1MeV, thereby for number system, detect lower bound by improving, reduce sample-out count, can improve the sensitivity of surveying the 60Co source.Simultaneously can determine to survey the counting rate and the power spectrum of the system in the time of distinguishing interior background and comprise the X-ray check equipment work, and the system that calculates surveys the sensitivity difference amount when this sensitivity that can distinguish reaches and X-ray check equipment is not worked.Detect lower bound by setting this, radioactive matter monitoring equipment 201 does not write down the low energy scattered ray that is lower than this detection lower bound, only writes down the high energy radioactive ray, thereby has reduced the influence of scattered ray to radioactive matter monitoring.
When the X-ray check equipment work, because of unlatching, goods turnover and the size of plumbous curtain, the difference of quality, may cause scattered ray to pile up toward the high energy district, cause the strange change of counting rate and spectral pattern, thereby bring difficulty for the setting that detects lower bound.From Fig. 3 as seen, the part black power spectrum at the expression scattered ray energy in above-mentioned low energy district is a smooth power spectrum continuous, no obvious characteristic peak, that be the index decreased type.On the contrary, the ray energy spectrum of all radiomaterials all should have characteristic peak and the power spectrum that structure is arranged.Therefore, to by using multichannel pulse scope-analyzer to detect the radiomaterial detection system of the radioactive ray power spectrum that described tested object sends, by the black power spectrum being carried out technical finesses such as digital filtering technique and smooth treatment, energy calibration, spectrum unscrambling, the continuous smooth background spectrum that comprises scattered ray can be filtered, thereby reduce the influence of scattered ray radioactive matter monitoring.Described digital filtering technique comprises various ways, as designs a high pass low-cut filter F () and be used for changing power spectrum, as Bj=F (Ai) i=1, and 2,3 ... 1024, Ai is the original power spectrum of obtaining herein, Bj is through the filtering power spectrum.Because the energy resolution of detector measurement ray is fixing and known (passing through scale), so the frequency spectrum of institute's selecting filter is known.Utilize above-mentioned digital filtering technique to replenish the setting that detects lower bound, can reduce the difficulty of spectrum unscrambling and peak-seeking, peak identification.
Those skilled in the art can expect that the shielding scheme that will use heavy metal material to X ray is applied among each embodiment.And, can shield be set and embodiments such as detecting lower bound be set separately and be used in combination above.Those of ordinary skill in the art can also find out various modification and alternative under the condition that does not break away from general idea of the present invention, it is all within the application's protection domain.Term " comprises/comprise " does not get rid of the element/step outside listed element/step, and " one/a kind of " does not get rid of a plurality of situation that comprises.
Claims (14)
1. one kind is used for tested object carried out that radiomaterial is surveyed and the system of X-ray radiant image, and described system comprises:
X-ray check equipment is used for tested object is carried out the X-ray radiation imaging inspection;
Radioactive matter monitoring equipment with described X-ray check equipment placed adjacent, is used to detect the radioactive ray that described tested object sends;
It is characterized in that this system also comprises:
Be used to stop that the X-ray radiation arrives the device of described radioactive matter monitoring equipment.
2. the system as claimed in claim 1, it is characterized in that, the described device that is used to stop that the X-ray radiation arrives described radioactive matter monitoring equipment comprises that part surrounds described radioactive matter monitoring equipment and arrive the baffle of described radioactive matter monitoring equipment so that stop described X-ray radiation, and described baffle has the radioactive ray that openings at one side sends tested object and arrives described radioactive matter monitoring equipment by described opening.
3. system as claimed in claim 2 is characterized in that, the shape of described baffle is to select from the group of being made up of following different shape: the shape of a hoof, C type and the polygon with openings at one side.
4. the system as claimed in claim 1 is characterized in that, described system also comprises conveyer, is used for tested object is sent to described X-ray check equipment from the position of accepting radioactive matter monitoring;
5. system as claimed in claim 4 is characterized in that, has an angle between the axis of described opening and the direction of transfer of described tested object, so that the radioactive ray that the described tested object of correct detection sends.
6. system as claimed in claim 5 is characterized in that, described angle is between 30 to 60 degree.
7. system as claimed in claim 6 is characterized in that, described angle is 45 degree.
8. the system as claimed in claim 1, it is characterized in that, the described device that is used to stop that the X-ray radiation arrives described radioactive matter monitoring equipment comprises unidirectional baffle, described unidirectional baffle is placed between described radioactive matter monitoring equipment and the X-ray check equipment, is used to block described X-ray radiation and arrives described radioactive matter monitoring equipment.
9. system as claimed in claim 8 is characterized in that, described unidirectional baffle comprises and is used to block the yi word pattern baffle that described X-ray radiation arrives described radioactive matter monitoring equipment.
10. the system as claimed in claim 1 is characterized in that, described radioactive matter monitoring equipment and the described device that is used to stop that the X-ray radiation arrives described radioactive matter monitoring equipment are placed in the porch of described X-ray check equipment.
11. system as claimed in claim 10, it is characterized in that described radioactive matter monitoring equipment and the described device that is used to stop that the X-ray radiation arrives described radioactive matter monitoring equipment are placed in upside, downside, left side, right side or its combination of the porch of described X-ray check equipment.
12. the system as claimed in claim 1 is characterized in that, described radioactive matter monitoring equipment and the described device that is used to stop that the X-ray radiation arrives described radioactive matter monitoring equipment are placed in the exit of described X-ray check equipment.
13. system as claimed in claim 12, it is characterized in that described radioactive matter monitoring equipment and the described device that is used to stop that the X-ray radiation arrives described radioactive matter monitoring equipment are placed in upside, downside, left side, right side or its combination in the exit of described X-ray check equipment.
14., it is characterized in that the described device that is used to stop that the X-ray radiation arrives described radioactive matter monitoring equipment is made by heavy metal as each described system of claim 1-13.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200794595U CN201196635Y (en) | 2008-03-18 | 2008-03-18 | Integration system used for active material detection and X ray radiation imaging |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200794595U CN201196635Y (en) | 2008-03-18 | 2008-03-18 | Integration system used for active material detection and X ray radiation imaging |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009114992A1 (en) * | 2008-03-18 | 2009-09-24 | 同方威视技术股份有限公司 | Integrated system and integrated method for x-ray radiation imaging and radioactive matter monitoring |
| CN101539557B (en) * | 2008-03-18 | 2013-12-18 | 同方威视技术股份有限公司 | Integrating system for radioactive substance detection and X-ray radiation imaging |
| CN104374784A (en) * | 2014-11-05 | 2015-02-25 | 同方威视技术股份有限公司 | Detection system and method for synchronously positioning radioactive substances |
-
2008
- 2008-03-18 CN CNU2008200794595U patent/CN201196635Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009114992A1 (en) * | 2008-03-18 | 2009-09-24 | 同方威视技术股份有限公司 | Integrated system and integrated method for x-ray radiation imaging and radioactive matter monitoring |
| US7848486B2 (en) | 2008-03-18 | 2010-12-07 | Nuctech Company Limited | Integrated system and integrating method for radioactive material detection and X-ray radiation imaging |
| CN101539557B (en) * | 2008-03-18 | 2013-12-18 | 同方威视技术股份有限公司 | Integrating system for radioactive substance detection and X-ray radiation imaging |
| CN104374784A (en) * | 2014-11-05 | 2015-02-25 | 同方威视技术股份有限公司 | Detection system and method for synchronously positioning radioactive substances |
| CN104374784B (en) * | 2014-11-05 | 2017-05-17 | 同方威视技术股份有限公司 | Detection system and method for synchronously positioning radioactive substances |
| US9945794B2 (en) | 2014-11-05 | 2018-04-17 | Nuctech Company Limited | Inspection systems and methods for synchronously positioning radioactive material |
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