CN104155675A - Radiation source positioning and imaging device - Google Patents
Radiation source positioning and imaging device Download PDFInfo
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- CN104155675A CN104155675A CN201410429482.2A CN201410429482A CN104155675A CN 104155675 A CN104155675 A CN 104155675A CN 201410429482 A CN201410429482 A CN 201410429482A CN 104155675 A CN104155675 A CN 104155675A
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- radiographic source
- imaging device
- collimating apparatus
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- source positioning
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Abstract
The invention discloses a radiation source positioning and imaging device. The radiation source positioning and imaging device comprises a detector and a holder. The detector comprises an orientating assembly and an imaging assembly, wherein the orientating assembly has a 4pi stereoscopic visual angle and judges the direction of a radiation source preliminarily, and the imaging assembly has a conical visual angle and positions the radiation source accurately in an image mode. According to the radiation source positioning and imaging device, the orientating assembly and the imaging assembly are adopted at the same time, the orientating assembly has the 4pi stereoscopic visual angle basically, and therefore the radiation source in an unknown environment can be quickly positioned; imaging is carried out through the imaging assembly, and therefore the radiation source in the environment can be effectively, conveniently and quickly positioned and imaged.
Description
Technical field
The present invention relates to Hotspot of Radioactivity search and the imaging in radiation safety field, be specifically related to the mechanism for radiogenic positioning and imaging.
Background technology
Adopt at present conventionally gamma imaging technique to carry out radiogenic remote search and location fast, common, practical good imaging technique has coded aperture imaging, pinhole imaging system, parallel hole imaging, point by point scanning etc.All relatively limit to the visual field of these imaging modes, and in the operation of searching on a large scale and scanning, efficiency is lower.
Use BIOImaging Analyzer (gamma camera) to carry out radiographic source search and can provide accurately, intuitively radiogenic positional information in larger distance, but the collection that conventionally needs rotation probe to carry out multiple image just can complete the investigation of a circumstances not known, and operating efficiency is lower.The present invention is intended to provide a kind of method of radiographic source fast searching, can carry out high efficiency radioactivity investigation to circumstances not known, solves the blindness in radioactive source search process.
Summary of the invention
For problems of the prior art, object of the present invention is for a kind of device that can fast searching radiographic source and this radiographic source is carried out to imaging is provided, circumstances not known is carried out to efficient radioactivity investigation.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of radiographic source positioning imaging device, comprises probe,
Described probe comprises orientation assemblies and image-forming assembly, and described orientation assemblies has 4 π perspective view, and described orientation assemblies tentatively judges radiogenic direction, and described image-forming assembly has taper visual angle, with the form of image, radiographic source is accurately located.
Further, described orientation assemblies comprises scintillation crystal.
Further, described scintillation crystal be two-layer more than, and every layer is more than three, position angle by the detection information contrast judgement radiographic source between two-layer scintillation crystal in pitch orientation, by the position angle in the horizontal direction of the detection information contrast judgement radiographic source between the different scintillation crystals of individual layer.
Further, described image-forming assembly comprises optical lens, coding collimating apparatus and imaging detector, and described coding collimating apparatus is positioned at described imaging detector front, and described camera lens and described coding collimating apparatus are towards same direction.
Further, described coding collimating apparatus also connects a rotating mechanism, and described rotating mechanism drives described coding collimating apparatus to be rotated in a plane.
Further, the anglec of rotation of described coding collimating apparatus is-90 degree or 90 degree.
Further, described rotating mechanism comprises direct current generator, pinion wheel, gear wheel and stroke dog, described direct current generator is fixedly installed, described pinion wheel is arranged on the output shaft of described direct current generator, described gear wheel is fixedly connected with described coding collimating apparatus, and on the center line that is centered close to described gear wheel of described coding collimating apparatus, described gear wheel engages with described pinion wheel, described stroke dog is fixedly installed, coordinate projection in described coding collimating apparatus to limit the position of rotation of described coding collimating apparatus, by setting described direct current generator current threshold, whether recognition coding collimating apparatus rotate in place, order stops operating after rotateing in place.
Further, described imaging detector is arranged with screen layer outward, and the material of described screen layer adopts high density tungsten alloy.
Further, between described screen layer and described imaging detector, be filled with flexible material layer.
Further, described probe is arranged on a The Cloud Terrace, and described The Cloud Terrace communication connects a control module, and under the control of described control module, drives described probe to horizontally rotate or luffing.
The present invention compared with prior art, the present invention adopts orientation assemblies and image-forming assembly simultaneously, and orientation assemblies has 4 π perspective view substantially, thereby can position the radiographic source in circumstances not known rapidly, and carry out imaging by image-forming assembly, thereby efficiently realize easily the radiogenic positioning and imaging of this environment, circumstances not known is carried out to efficient radioactivity investigation.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Fig. 1 is the perspective view of radiographic source positioning imaging device of the present invention;
Fig. 2 is the three-dimensional sectional structure schematic diagram of radiographic source positioning imaging device of the present invention;
Fig. 3 is the workflow schematic diagram of radiographic source positioning imaging device of the present invention;
Fig. 4 is orientation assemblies structural representation in radiographic source positioning imaging device of the present invention;
Fig. 5 is the structural representation of rotating mechanism in radiographic source positioning imaging device of the present invention.
Fig. 6 is direct current generator curent change schematic diagram in radiographic source positioning imaging device of the present invention;
Embodiment
The exemplary embodiments that embodies feature & benefits of the present invention will describe in detail in the following description.Be understood that the present invention can have various variations on different embodiment, it neither departs from the scope of the present invention, and explanation wherein and accompanying drawing be when the use that explain in itself, but not in order to limit the present invention.
As depicted in figs. 1 and 2, radiographic source positioning imaging device of the present invention, comprises probe and The Cloud Terrace, and probe comprises orientation assemblies 1 and image-forming assembly 2, orientation assemblies 1 and the equal communication link control module of image-forming assembly 2.Orientation assemblies 1 has 4 π perspective view, and image-forming assembly 2 can be adjusted visual field direction by cloud platform rotation.Radiographic source positioning imaging device of the present invention can first position the radiographic source existing in environment by orientation assemblies 1, again according to radiogenic azimuth information, under the drive of The Cloud Terrace, be adjusted to picture assembly 2 towards, radiographic source is carried out to imaging, because orientation assemblies 1 has 4 π perspective view, therefore can comprehensively survey, and image-forming assembly 2 is adjustable, conveniently does specific aim imaging.This process as shown in Figure 3, comprises the steps:
S1: orientation assemblies 1 provides the threshold of crossing of Environmental dose rate and reports to the police;
S2: according to the detection information of orientation assemblies 1, obtain radiogenic azimuth information, this process completes in upper computer end;
S3:(upper computer end) send control command rotary platform, make image-forming assembly 2 towards radiographic source;
S4: image-forming assembly 2 completes the positive and negative data acquisition of coding collimating apparatus 22, obtains radiographic source image and optical imagery, obtains fused images in upper computer end.
As shown in Figure 4, and with reference to figure 2, in the present embodiment, orientation assemblies 1 comprises that scintillation crystal 11, photoelectric device 12, signal draw circuit 13, signal shaping circuit 14 and orientation assemblies power module 15.Scintillation crystal 11 be two-layer more than, and every layer be more than three, in the present embodiment, scintillation crystal 11 is two-layer, four every layer.The course of work of orientation assemblies 1 of the present invention is: scintillation crystal 11 catches radiographic source information and sends to photoelectric device 12, photoelectric device 12 is converted to electric signal by radiographic source information and sends to signal draws circuit 13, signal is drawn circuit 13 electric signal is carried out sending to signal shaping circuit 14 after data processing, signal shaping circuit 14 determines radiogenic positional information and exported according to the information of sending, and orientation assemblies power module 15 is drawn circuit 13 and signal shaping circuit 14 provides power supply for scintillation crystal 11, photoelectric device 12, signal.
Orientation assemblies 1 in the present embodiment adopts bulk scintillation crystal 11 hierarchal arrangement to survey incident gamma rays, radiographic source is the position angle difference of this assembly relatively, the distribution ratio difference of the example number obtaining on each crystal, by simulation, actual measurement and matching, the corresponding relation of position angle and distribution ratio is pre-stored in equipment as empirical value, in actual measurement operation, the distribution ratio of example number on obtained different crystal and this empirical value are compared, can instead push away radiogenic position angle.The structure that adopts scintillation crystal 11 hierarchal arrangement, makes in level and pitch orientation, all to have certain angular resolution.Adopt bulk scintillation crystal 11, there is very high detection efficiency, can respond and Threshold Alerts the gamma dose rate in environment fast.The shell of fixing and this assembly to scintillation crystal array should adopt the material of lightweight as far as possible in the situation that ensureing sufficient intensity, so that gamma rays as much as possible is detected, improves detection efficiency and sensitivity.This assembly can respond fast to the radiographic source of periphery, and angular response precision is 10 ° of left and right under normal circumstances.
As shown in Figure 2, and please refer to Fig. 5, in the present embodiment, image-forming assembly 2 has taper visual angle, with the form of image, radiographic source is accurately located, and its cone angle can be 20 °, 40 ° or 60 °, and the best is 40 °.Image-forming assembly 2 comprises pedestal 20, optical lens 21, coding collimating apparatus 22, imaging detector 23, rotating mechanism 24 and image-forming assembly power module 25.Image-forming assembly power module 25 provides power supply for electric and electronic parts, optical lens 21 is common optical lens, coding collimating apparatus 22 is positioned at imaging detector 23 fronts, and optical lens 21 is with coding collimating apparatus 22 towards same direction, and in the present embodiment, both are arranged on the same face.In the present embodiment, imaging detector 23 is position sensitive gamma ray detectors, is arranged on a fixed head 26.The outer screen layer that is arranged with of imaging detector 23, this screen layer employing high density heavy metal shield material (for example high density tungsten alloy) is made barreled screen layer and is close to gamma ray detectors, to disturbing ray to shield well around.Between screen layer 231 and imaging detector 23, be filled with flexible material layer (not shown), to protect imaging detector 23.Due to the screen layer 231 in the present invention, to be only sheathed on imaging detector 23 outer upper, arranges compared with screen layer, in the weight that ensures to have reduced to greatest extent on the good basis of shielding properties screen layer with traditional on probe.
In the present embodiment, coding collimating apparatus 22 also connects a rotating mechanism 24, and rotating mechanism 24 drives coding collimating apparatus 22 in a plane, to carry out reciprocating rotary, and the anglec of rotation of coding collimating apparatus 22 is that-90 degree are to 90 degree, for reducing background interference noise.Rotating mechanism 24 comprises direct current generator 241, pinion wheel 242, gear wheel 243 and stroke dog 244, direct current generator 241 is fixedly installed, pinion wheel 242 is arranged on the output shaft of direct current generator 241, gear wheel 243 is fixedly connected with coding collimating apparatus 22, and on the center line that is centered close to gear wheel 243 of coding collimating apparatus 22, gear wheel 243 engages with pinion wheel 242, and stroke dog 244 is fixedly installed, the position of rotation of the projection restriction coding collimating apparatus 22 in matching coding collimating apparatus 22.By controlling, direct current generator 241 is positive and negative transfers the positive and negative switching that realizes coding collimating apparatus 22, taking just transfer to routine detailed process as: 1. send forward order and make direct current generator 241 forwards, 2. while rotateing in place, stroke dog 244 is stopped, there is stall in direct current generator 241, identify stall and send stall order by setting locked rotor current recognition threshold I0, in order to avoid burn out direct current generator 241, current peak I1 when the setting of electric current recognition threshold I0 should be greater than direct current generator 241 and starts, current value I 2 should be less than direct current generator 241 stall time, Fig. 6 has provided direct current generator 241 curent change situations, in figure, being converted into voltage shows, when direct current generator 241 has just started, there is the starting current of a spike, be approximately 0.8A, rotate beginning after-current and be stabilized in 0.07A, after direct current generator 241 is braked, electric current moment rises and forms level and smooth straight line, its value is 1.3A left and right, to avoid on the one hand direct current generator 241 to start and cause false triggering, to ensure on the other hand can trigger after stall, therefore stall recognition threshold is set as 1.1A.
In the present invention, image-forming assembly 2 field ranges are typically designed to 20 °～60 °, in the positioning precision of orientation assemblies 1, can cover the actual position of radioactive source, on the preliminary directed basis of orientation assemblies 1, image-forming assembly 2, again towards this direction, carries out the accurate location of radioactive source, provide source positions image, imaging type positioning precision is conventionally at 1 °～4 °.
Be generally and reduce costs, the operation of probe adopts manual type.But for convenience of automatic operation probe, also probe can be arranged on a The Cloud Terrace, The Cloud Terrace communication link control module, and under the control of control module, drive probe to horizontally rotate or luffing.
The present invention compared with prior art, the present invention adopts orientation assemblies 1 and image-forming assembly 2 simultaneously, and orientation assemblies 1 has 4 π perspective view substantially, thereby can position the radiographic source in circumstances not known rapidly, and carry out imaging by image-forming assembly 2, thereby efficiently realize easily the radiogenic positioning and imaging of this environment, circumstances not known is carried out to efficient radioactivity investigation.
Technical scheme of the present invention is disclosed as above by preferred embodiment.Those skilled in the art should recognize change and the retouching the scope and spirit of the present invention that the appended claim of the present invention discloses, done in the case of not departing from, within all belonging to the protection domain of claim of the present invention.
Claims (10)
1. a radiographic source positioning imaging device, comprise probe, it is characterized in that, described probe comprises orientation assemblies and image-forming assembly, described orientation assemblies has 4 π perspective view, described orientation assemblies tentatively judges radiogenic direction, and described image-forming assembly has taper visual angle, with the form of image, radiographic source is accurately located.
2. radiographic source positioning imaging device as claimed in claim 1, is characterized in that, described orientation assemblies comprises scintillation crystal.
3. radiographic source positioning imaging device as claimed in claim 2, it is characterized in that, described scintillation crystal be two-layer more than, and every layer is more than three, position angle by the detection information contrast judgement radiographic source between two-layer scintillation crystal in pitch orientation, by the position angle in the horizontal direction of the detection information contrast judgement radiographic source between the different scintillation crystals of individual layer.
4. radiographic source positioning imaging device as claimed in claim 1, it is characterized in that, described image-forming assembly comprises optical lens, coding collimating apparatus and imaging detector, and described coding collimating apparatus is positioned at described imaging detector front, and described camera lens and described coding collimating apparatus are towards same direction.
5. radiographic source positioning imaging device as claimed in claim 4, is characterized in that, described coding collimating apparatus also connects a rotating mechanism, and described rotating mechanism drives described coding collimating apparatus to be rotated in a plane.
6. radiographic source positioning imaging device as claimed in claim 5, is characterized in that, the anglec of rotation of described coding collimating apparatus is-90 degree or 90 degree.
7. radiographic source positioning imaging device as claimed in claim 6, it is characterized in that, described rotating mechanism comprises direct current generator, pinion wheel, gear wheel and stroke dog, described direct current generator is fixedly installed, described pinion wheel is arranged on the output shaft of described direct current generator, described gear wheel is fixedly connected with described coding collimating apparatus, and on the center line that is centered close to described gear wheel of described coding collimating apparatus, described gear wheel engages with described pinion wheel, described stroke dog is fixedly installed, coordinate projection in described coding collimating apparatus to limit the position of rotation of described coding collimating apparatus, by setting described direct current generator current threshold, whether recognition coding collimating apparatus rotate in place, order stops operating after rotateing in place.
8. radiographic source positioning imaging device as claimed in claim 4, is characterized in that, described imaging detector is arranged with screen layer outward, and the material of described screen layer adopts high density tungsten alloy.
9. radiographic source positioning imaging device as claimed in claim 8, is characterized in that, between described screen layer and described imaging detector, is filled with flexible material layer.
10. the radiographic source positioning imaging device as described in as arbitrary in claim 1-9, it is characterized in that, described probe is arranged on a The Cloud Terrace, and described The Cloud Terrace communication connects a control module, and under the control of described control module, drives described probe to horizontally rotate or luffing.
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| CN201410429482.2A CN104155675A (en) | 2014-08-27 | 2014-08-27 | Radiation source positioning and imaging device |
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| CN105866819A (en) * | 2016-05-20 | 2016-08-17 | 浙江省辐射环境监测站 | Radioactive monitoring equipment |
| CN107831526A (en) * | 2017-11-02 | 2018-03-23 | 北京大学 | A kind of medium energy electrons probe unit, detection probe and detector |
| CN108535768A (en) * | 2018-03-13 | 2018-09-14 | 江苏超敏科技有限公司 | A kind of gamma camera based on double detector technology |
| CN108717199A (en) * | 2018-06-19 | 2018-10-30 | 清华大学 | Radioactive substance image supervisory control device and method based on multi-detector |
| CN108776322A (en) * | 2018-02-26 | 2018-11-09 | 奕瑞新材料科技（太仓）有限公司 | Radiographic source localization method |
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Application publication date: 20141119 |