CN102288983A - Gamma ray imaging spectrometer - Google Patents
Gamma ray imaging spectrometer Download PDFInfo
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- CN102288983A CN102288983A CN201110130459XA CN201110130459A CN102288983A CN 102288983 A CN102288983 A CN 102288983A CN 201110130459X A CN201110130459X A CN 201110130459XA CN 201110130459 A CN201110130459 A CN 201110130459A CN 102288983 A CN102288983 A CN 102288983A
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Abstract
The invention provides a gamma ray imaging spectrometer, which consists of a uniform redundancy array coding plate, a detection module, a front-end signal processing module, an A/D (Analogue/Digital) module, a control module, a data interface module, a power supply module and a lead shielding layer, wherein in the lead shielding layer, the uniform redundancy array coding plate is arranged at the front end of the detection module; the detection module is connected to the front-end signal processing module through a flat cable; the A/D module and the front-end signal processing module are connected with the control module through dual-row contact pins; the control module is connected with the data interface module through a flat cable socket; the data interface module is transmitted to an upper PC (Personal Computer) through Ethenet; and the power supply module is used for inputting a low-voltage direct current power supply to the system and then respectively supplying the processed low-voltage direct current power supply to each module. The gamma ray imaging spectrometer provided by the invention can be used for imaging gamma rays and measuring gamma ray spectrometer.
Description
Technical field
The invention belongs to gamma-rays radiometric technique field, be specifically related to a kind of gamma ray imaging energy spectrometer.
Background technology
Gamma ray is produced by the atomic nucleus internal state change, and promptly atomic nucleus transits to the light that emits than the low-lying level process from excited state, thereby gamma spectrum can reflect nuclear Partial Feature; The gamma ray difference that different elements are launched can be composed by the gamma ray characteristic that the radioactive element decay is sent and be distinguished different elements.By diagnosis to different gamma rays, can obtain the image and the gamma-spectrometric data of gamma-ray source, and then information such as the kind of acquisition gamma-ray source and position.The imaging of gamma ray and power spectrum diagnosis have great importance for Physical Experiment and radiative material check.
The method that is generally used for the diagnosis of gamma ray power spectrum has the filter disc method, activation method, and multiple tracks measuring method or the like, wherein the filter disc method relates to the complicated spectrum unscrambling calculating and the second order effect of high-energy gamma ray; Activation method has minimum requirements to gamma energy, is mainly used to judge the high energy gamma radiation; Multiple tracks is measured also needs to relate to spectrum unscrambling calculating.Above method all is not too desirable for the diagnostic accuracy of gamma ray power spectrum, and requires a great deal of time and carry out follow-up data and handle, and can't provide the gamma ray gamma-spectrometric data very soon.When it obtains the gamma ray power spectrum, can not provide the image of corresponding gamma ray, say nothing of measurement for the gamma ray position.
Early stage gamma ray imaging system adopts scan method to come imaging.This system cooperates one can move continuously at selected coordinate direction by adopting a flicker type gamma-ray detector, and promptly the focussed collimated device that moves in the mode of parallel sweep scans the zone of many detections.The shortcoming of these early stage imaging systems is that the required time shutter of acquisition gamma ray source images is longer, and in addition, it is difficult to realize dynamic studies.
Radiation detecting system utilization " Anger " the type gamma scintillation camera of another kind of type is measured the gamma ray image in the prior art; On its basis, developed single photon emission computed tomography photograph SPECT (Single Photon Emission Computerized Tomography) again; Recently, the Anger camera is used to positron emission imaging system PET (Positron Emission Computerized Tomography, be called for short PECT or PET), it is mainly used in anatomic image and the function image that obtains human body, improves the diagnosis capability to disease.The limitation of Anger type camera derives from the process that scintillation photons is converted to electric signal.Disturbing factor comprises: the variation of the distance of effect angle of (1) photomultiplier and generation scintillation event point; (2) because refractive index does not match the anaclasis that causes and photoconduction to propagation; (3) unavoidable blind area between the photomultiplier; (4) effective density of remote photomultiplier; (5) the inconsistent spatial sensitivity of each photomultiplier; (6) variation from a photomultiplier to another photomultiplier sensitivity; (7) transient change of photomultiplier sensitivity.Other error then derives from the instability of photomultiplier and the frangibility and the hydroscopicity of scintillation crystal.
Traditional gamma imaging device Front-end Design single pin-hole collimator, be used for pin-hole imaging, exist that logical light quantity is little, property is made an uproar than deficiency such as low, need time exposure just can finish imaging to target to be measured.
The Chinese patent literature database discloses the patented claim technology that a kind of denomination of invention is gamma imaging device (public announcement of a patent application CN101718875A), in this application for a patent for invention, disclosed gamma imaging device can only be used for the gamma-rays imaging measurement, and can not be used for the gamma-rays spectral measurement.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of gamma rays imaging energy spectrometer, and it can be used for the gamma rays imaging, can be used for the gamma rays spectral measurement again.
Gamma ray imaging energy spectrometer of the present invention contains even redundant array encoding board, detecting module, front end signal processing module, A/D module, control module, data interface module, power module, lead shield layer; In outermost lead shield layer, detecting module is connected with the front end signal processing module; The A/D module is with after front end signal processing module interface is connected, again by double contact pin and control module in succession; Control module is connected with data interface module by the winding displacement socket; Data interface module is defeated by upper PC by Ethernet; After handling, electric power source pair of module system input low-voltage dc power supply supplies with each module respectively; Be characterized in: described energy spectrometer also is provided with even redundant array encoding board at the front end of detecting module.
Even redundant array encoding board among the present invention is designed to r * s matrix, and wherein r, s are prime number, and r-s=2, and the aperture is 3mm * 3mm square hole or circular hole, and evenly the redundant array encoding board adopts tungsten to make.
Detecting module among the present invention is made up of 1024 road H9500 position sensitive photo-multiplier tube arrays and scintillation crystal array.
Scintillation crystal in the detecting module among the present invention can adopt yttrium luetcium silicate or bismuth germanium oxide or wolframic acid germanium.
Even redundant array encoding board among the present invention can overcome that the logical light quantity that single needle borescopic imaging technology exists is little, property is made an uproar than deficiency such as low, has very high luminous flux, 50% logical light of the total area, and autocorrelation function is flat secondary lobe, effectively suppressed intrinsic noise, resolution with the imaging system of its structure equals its minimum-value aperture, also has certain chromatography ability simultaneously.
The present invention measures the incident gamma rays by the two-dimensional detection array that scintillator medium and position sensitive photo-multiplier tube constitute: according to the size of gamma photons yield and detector cells, choose suitable placement distance and filter disc parameter (material and thickness), guaranteeing has a gamma photons incident at most on each probe unit.Along with the change of gamma photons energy, the response signal of detector cells also changes thereupon, and its response relation can calculate and the demarcation acquisition of standard gamma radiation source by Monte Carlo simulation.The number that will have identical signal response adds up, and can obtain the relation between incident gamma rays energy and the gamma-ray photon number, can obtain the gamma rays power spectrum.When needs obtain the gamma rays image-forming diagnose, can reduce the distance between detector and the radiation source, have on the probe unit this moment and surpass more than one gamma photons incident, the signal response of detector is strong and weak relevant with incident photon, and detector is arranged according to two dimension can obtain the gamma rays picture signal.
For the gamma rays diagnosis, because a large amount of picture element signals needs to handle, high data processing speed requires the better electronics treatment circuit of performance.When the travelling speed aspect of electronic system is restricted, then the imaging counting rate that can obtain is limited.Each probe unit of the present invention all is equipped with a follow-up electronics processing unit, can reach sufficiently high data processing speed like this.
Gamma imaging energy spectrometer of the present invention comprises scintillation crystal, photomultiplier tube array (1024 road) and the follow-up electronics disposal system to the gamma rays sensitivity.Wherein, scintillator crystals and gamma rays effect, the atom and molecule de excitation in the medium is luminous, produces the fluorescent emission of fixed wave length, and this wavelength and scintillator absorbing wavelength are not overlapping, can finely see through crystal.When scintillator thickness was certain, fluorescent yield was relevant with incident gamma photons energy; Photomultiplier is used to collect the fluorescence that scintillator produces, and is translated into photoelectron, multiplication output electric signal, and the output signal size is directly proportional with fluorescent photon quantity; Follow-up electronics disposal system is used for amplifying, record output electric signal, if photomultiplier is a multiple tracks, then need to obtain the output signal of each channel photomultiplier, and between each passage consistance preferably arranged, and prevent to crosstalk, amplitude autokinetic effect or the like.
Gamma rays imaging energy spectrometer characteristics of the present invention are to adopt yttrium luetcium silicate as core imaging and survey spectrum assembly, are made up of yttrium luetcium silicate, position sensitive photo-multiplier tube array (1024 road) and follow-up three parts of electronics disposal system.The assembly of gamma rays imaging energy spectrometer per pass can be for convenience detach and be installed, and is convenient to inspection, replacing and fault handling.Gamma ray imaging energy spectrometer spectrum unscrambling process of the present invention is simple, and the power spectrum energy resolution that obtains is higher, and data are obtained comparatively fast.
Description of drawings
Fig. 1 is a gamma ray imaging energy spectrometer general structure block diagram of the present invention.
Fig. 2 is gamma ray imaging energy spectrometer circuit theory diagrams of the present invention.
Fig. 3 is a gamma ray imaging energy spectrometer software processes process flow diagram of the present invention.
Among the figure: 1. scintillation crystal array 2. position sensitive photo-multiplier tube arrays 3. front end signal processing module 4.A/D modules 5. control modules 6. data interface modules 7. power modules 8. lead shield layers 9. even redundant array encoding board 10. probes 11. enabling signal 12.PC machines 13. radioactive source 14. to be measured can spectral model 15. imaging patterns.
Embodiment
Fig. 1 is a gamma ray imaging energy spectrometer general structure block diagram of the present invention, as can be seen from Figure 1, the outermost layer of gamma ray imaging energy spectrometer of the present invention is provided with lead shield layer 8, and evenly redundant array encoding board 9, scintillation crystal array 1, position sensitive photo-multiplier tube array 2, front end signal processing module 3, A/D module 4, control module 5, data interface module 6, power module 7 are linked in sequence.
Fig. 2 is gamma ray imaging energy spectrometer circuit theory diagrams of the present invention, as can be seen from Figure 2, system is made of 4 identical probes 10 of structure, each probe is joined a position sensitive photo-multiplier tube array 2 by the scintillation crystal array 1 of one 256 pixel and is constituted, the position sensitive photo-multiplier tube array is 16 * 16 arrays, and 4 probes of total system constitute 1024 locations of pixels sensitive detectors.A/D module 4 and front end signal processing module interface 3 are used double contact pin and control module in succession; Control module 5 re-uses the winding displacement socket and is connected with data interface module 6; Data interface module 6 is defeated by upper PC 12 by Ethernet; After handling, 7 pairs of systems of power module input low-voltage dc power supply supplies with each module respectively.
Fig. 3 is a gamma ray imaging energy spectrometer workflow diagram of the present invention, before gamma-ray source 13 goes out bundle, an enabling signal 11 can be provided, the gamma ray imaging system is after receiving this enabling signal, be ready to detector system, guarantee certain hour (about 1 μ s) before gamma ray beam arrives detector, begin, guarantee to cover gamma ray beam launch time 1024 passage synchronized samplings (about 10 μ s).After collecting computer obtains raw data, select energy spectral model 14 or imaging pattern 15, carry out data processing, form power spectrum or image for customer analysis according to the user.
Its concrete manufacturing process: the array in the described even redundant array encoding board is r * s matrix, and wherein r, s are prime number, and r-s=2, specifically can be: 13 * 11,19 * 17,31 * 29; Evenly the hole on the redundant array encoding board is square hole or circular hole, and the aperture is 3mm * 3mm; Evenly the redundant array encoding board adopts tungsten to make.Choose shape, size and the thickness of suitable yttrium luetcium silicate, machine-shaping.Be of a size of a millimeter magnitude.For the performance parameter that makes recording medium is consistent as far as possible, the larger-size yttrium luetcium silicate recording medium of same or same batch is cut into the fritter recording medium of identical size, regular shape, it is of a size of the mm magnitude.Adopt packaging technology with each fritter yttrium luetcium silicate encapsulation, parameter request: rectangular structure, 3mm * 3mm, length 10mm, be the ns magnitude time response.Yttrium luetcium silicate after the encapsulation is close to the position sensitive photo-multiplier tube light-sensitive surface, guarantee in the sensitive photomultiplier in in-position of the fluorescence maximum that yttrium luetcium silicate sends.The output line that position sensitive photo-multiplier tube is reserved is connected to the signal input interface of follow-up electronics disposal system, forms to comprise the separate detectors unit that recording medium, opto-electronic conversion and independent electronics are handled together.Again successively with other detector cells according to connection noted earlier good after, detector cells is arranged with 16 * 16 two-dimensional array, guarantee that yttrium luetcium silicate all is in same plane, again 4 16 * 16 detector array is formed one 32 * 32 detector array, this array comprises 1024 detector cells, and each unit is made up of yttrium luetcium silicate, position sensitive photo-multiplier tube and electronics treatment circuit.Make up the electronics disposal system at last, with the output signal in each road of detector by collection, amplification, denoising after, output to special data collecting card by data line, then through after the AD conversion, output on the computing machine, adopt specific software to data add up, graphics process.
Claims (4)
1. a gamma ray imaging energy spectrometer contains even redundant array encoding board, detecting module, front end signal processing module, A/D module, control module, data interface module, power module, lead shield layer; In outermost lead shield layer, detecting module is connected with the front end signal processing module; The A/D module is with after front end signal processing module interface is connected, again by double contact pin and control module in succession; Control module is connected with data interface module by the winding displacement socket; Data interface module is defeated by upper PC by Ethernet; After handling, electric power source pair of module system input low-voltage dc power supply supplies with each module respectively; It is characterized in that: described energy spectrometer also is provided with even redundant array encoding board at the front end of detecting module.
2. gamma ray imaging energy spectrometer according to claim 1 is characterized in that: position sensitive photo-multiplier tube array and scintillation crystal array that the assembly in the described detecting module adopts Japanese HAMAMATSU company to produce.
3. gamma ray imaging energy spectrometer according to claim 1 is characterized in that: the array in the described even redundant array encoding board is r * s matrix, and wherein r, s are prime number, and r-s=2; Evenly the hole on the redundant array encoding board is square hole or circular hole, and the aperture is 3mm * 3mm; Evenly the redundant array encoding board adopts tungsten to make.
4. gamma ray imaging energy spectrometer according to claim 2 is characterized in that: the scintillation crystal in the described scintillation crystal array adopts yttrium luetcium silicate, bismuth germanium oxide or wolframic acid germanium.
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| CN201110130459XA CN102288983A (en) | 2011-05-19 | 2011-05-19 | Gamma ray imaging spectrometer |
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| CN201110130459XA CN102288983A (en) | 2011-05-19 | 2011-05-19 | Gamma ray imaging spectrometer |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616713A (en) * | 2013-11-25 | 2014-03-05 | 中国科学院高能物理研究所 | Detector and detecting system |
| CN104730565A (en) * | 2015-03-10 | 2015-06-24 | 中国科学院上海光学精密机械研究所 | Ultrafast gamma ray energy disperse spectroscopy |
| CN104730564A (en) * | 2015-03-10 | 2015-06-24 | 中国科学院上海光学精密机械研究所 | Ultrafast gamma ray energy spectrum measuring instrument based on scintillating-fiber array |
| TWI512315B (en) * | 2013-10-25 | 2015-12-11 | Iner Aec Executive Yuan | A gamma imaging probe position signal processing method |
| CN106597521A (en) * | 2016-12-28 | 2017-04-26 | 中国工程物理研究院激光聚变研究中心 | Fast neutron detector resisting interference of strong gamma rays and application method thereof |
| CN107765287A (en) * | 2017-11-20 | 2018-03-06 | 中国工程物理研究院激光聚变研究中心 | A kind of nuclear leakage survey meter and its method for detecting pollution sources |
| CN109669206A (en) * | 2019-03-03 | 2019-04-23 | 南昌华亮光电有限责任公司 | Circulating type liquid scintillator intelligence energy disperse spectroscopy system and its signal processing method |
| CN110515114A (en) * | 2019-08-26 | 2019-11-29 | 西安交通大学医学院第一附属医院 | Cherenkov's optical acquisition device and acquisition method in a kind of high-performance Patients During Radiotherapy |
| CN110646827A (en) * | 2019-09-09 | 2020-01-03 | 北京科技大学 | Large-visual-field radioactive source positioning system and positioning method |
| CN113419270A (en) * | 2021-06-23 | 2021-09-21 | 中国工程物理研究院激光聚变研究中心 | Online filter stack spectrometer |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI512315B (en) * | 2013-10-25 | 2015-12-11 | Iner Aec Executive Yuan | A gamma imaging probe position signal processing method |
| CN103616713A (en) * | 2013-11-25 | 2014-03-05 | 中国科学院高能物理研究所 | Detector and detecting system |
| CN103616713B (en) * | 2013-11-25 | 2016-06-29 | 中国科学院高能物理研究所 | detector and detection system |
| CN104730565A (en) * | 2015-03-10 | 2015-06-24 | 中国科学院上海光学精密机械研究所 | Ultrafast gamma ray energy disperse spectroscopy |
| CN104730564A (en) * | 2015-03-10 | 2015-06-24 | 中国科学院上海光学精密机械研究所 | Ultrafast gamma ray energy spectrum measuring instrument based on scintillating-fiber array |
| CN106597521A (en) * | 2016-12-28 | 2017-04-26 | 中国工程物理研究院激光聚变研究中心 | Fast neutron detector resisting interference of strong gamma rays and application method thereof |
| CN107765287A (en) * | 2017-11-20 | 2018-03-06 | 中国工程物理研究院激光聚变研究中心 | A kind of nuclear leakage survey meter and its method for detecting pollution sources |
| CN107765287B (en) * | 2017-11-20 | 2023-11-14 | 中国工程物理研究院激光聚变研究中心 | Nuclear leakage detector and method for detecting pollution source by using same |
| CN109669206A (en) * | 2019-03-03 | 2019-04-23 | 南昌华亮光电有限责任公司 | Circulating type liquid scintillator intelligence energy disperse spectroscopy system and its signal processing method |
| CN110515114A (en) * | 2019-08-26 | 2019-11-29 | 西安交通大学医学院第一附属医院 | Cherenkov's optical acquisition device and acquisition method in a kind of high-performance Patients During Radiotherapy |
| CN110646827A (en) * | 2019-09-09 | 2020-01-03 | 北京科技大学 | Large-visual-field radioactive source positioning system and positioning method |
| CN113419270A (en) * | 2021-06-23 | 2021-09-21 | 中国工程物理研究院激光聚变研究中心 | Online filter stack spectrometer |
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Application publication date: 20111221 |