WO2017146361A1 - Appareil de détection de produits alimentaires radioactifs à l'aide d'un multiplicateur d'électrons en phase gazeuse - Google Patents

Appareil de détection de produits alimentaires radioactifs à l'aide d'un multiplicateur d'électrons en phase gazeuse Download PDF

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Publication number
WO2017146361A1
WO2017146361A1 PCT/KR2016/014381 KR2016014381W WO2017146361A1 WO 2017146361 A1 WO2017146361 A1 WO 2017146361A1 KR 2016014381 W KR2016014381 W KR 2016014381W WO 2017146361 A1 WO2017146361 A1 WO 2017146361A1
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WIPO (PCT)
Prior art keywords
unit
gem
gas electron
gas
food
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PCT/KR2016/014381
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English (en)
Korean (ko)
Inventor
한창희
안봉재
Original Assignee
창원대학교 산학협력단
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Publication of WO2017146361A1 publication Critical patent/WO2017146361A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/346—Sorting according to other particular properties according to radioactive properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/02—Food
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G01T1/167—Measuring radioactive content of objects, e.g. contamination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T5/00—Recording of movements or tracks of particles; Processing or analysis of such tracks

Definitions

  • the present invention relates to a device for detecting a radioactive material of food using a gas electron amplifier (Gas Electron Multiplier, GEM) installed in a conveyor belt system, induces the photoelectric effect or the Compton effect by radiation emitted from the food material
  • GEM Gas Electron Multiplier
  • the present invention provides a radioactive material detection device that amplifies photoelectrons or compton electrons using a gas electron amplifier to measure nuclides and doses.
  • the gas electron amplifier technology is used by the F. Sauli and the Oliver RD Oliveira of the Gas Detector Development Group of the CERN to detect high energy particles.
  • the potential applicability is excellent, and various studies have been conducted by international advanced research groups.
  • the research related to the application is still in its infancy.
  • the gas has a relatively high photoelectric and compton effect for X-rays and ⁇ -rays in the range of several keV to several hundred keV, and because of the excellent position and time resolution of the GEM detector, real-time X using GEM technology.
  • Basic research on medical high-definition imaging technology for radiography is progressing rapidly.
  • the advantages of the GEM include low production costs, excellent safety, light weight, thin thickness, and high flexibility.
  • the GEM detector is an apparatus for detecting X-rays and ⁇ -rays or charged particles by ionizing a gas.
  • the GEM detector is not only effective for the measurement of charged particles, but also by adding BF3 to the gas inside the GEM detector or coating a neutron blocking material such as boron on the GEM foil.
  • the range of applications is wide enough to be used as a detector.
  • GM gas tube detectors are easy to move because they are measured by hand.
  • this method is a device that can only measure the dose of radiation, and because it does not have the ability to analyze the nuclide, there is a disadvantage that is used only for the measurement of special radiation. This is because there are various kinds of radiation in food.
  • the scintillator radiometer has the ability to analyze the nuclide, but has the disadvantage that it can measure only the ingredients processed in the form of powder. As such, it can be seen that measuring the radioactivity of powdered ingredients at school meal sites is problematic for use in an inefficient manner.
  • the present invention has been made to improve the above-mentioned conventional problems, and induces photoelectric effect or compton effect by radiation from food material and amplifies the emitted photoelectrons or compton electrons using a gaseous electron amplifier, the nuclide It is an object of the present invention to provide an apparatus for detecting radioactive substances in food using gaseous electron amplifiers that measure the amount and dose.
  • an apparatus for detecting a radioactive substance of a food material using a gas electron amplifier is an apparatus for detecting a radioactive substance of a food material using a gas electron amplifier, the photoelectron or compton electron
  • a GEM detector including an output unit for receiving and outputting the size of the electronic cloud; A transfer unit for moving food to a location where the GEM detector is installed; And an analysis unit (Readout Electronics) for amplifying and converting an electrical signal output from the GEM detector to analyze radionuclides and doses.
  • Readout electronics of the present invention is a charge signal amplifier for amplifying and converting an electrical signal transmitted from the output of the GEM detector into a voltage signal, AD conversion unit for converting the amplified voltage signal into a digital signal And a data acquisition unit (DAQ) for outputting the converted digital signal on a computer screen.
  • AD conversion unit for converting the amplified voltage signal into a digital signal
  • DAQ data acquisition unit
  • the conveying unit of the present invention includes a conveyor belt including a scale for weighing food ingredients, a CCD camera for detecting the position of the food ingredients, a shield for shielding the GEM detector from external radiation, and a power unit for driving the conveyor belt. It features.
  • the ionization electrons of the internal filling gas generated by inducing photoelectric effect or the Compton effect on the radiation from the food material or the ionizing electrons of the internal filling gas directly generated by the incident charged particles.
  • a gas electron amplifier to amplify through an avalanche in a GEM hole and measuring its nuclides and doses
  • conventional radiation detectors can measure only GM gas tube type, which can measure the dose, and food ingredients processed in powder form. There is an effect to improve the disadvantages of the scintillator method.
  • FIG. 1 is a bird's eye view of a radioactive material detection apparatus of a food material using a gas electron amplifier according to the present invention.
  • FIG. 2 is a schematic diagram of a GEM chamber (Chamber) according to the present invention.
  • FIG. 3 is a schematic diagram of an analysis unit (Readout Electronics) according to the present invention.
  • FIG. 4 is a schematic diagram of a radioactive material detection apparatus of a food material using a gas electron amplifier according to the present invention.
  • FIG. 1 is a bird's eye view of a radioactive material detection apparatus of a food material using a gas electron amplifier according to the present invention.
  • the apparatus for detecting a radioactive substance of a food material using a gas electron amplifier includes a photoelectron or a compton electron emitted by inducing a photoelectric effect or a compton effect by radiation from the food material.
  • a device for amplifying by using an amplifier and measuring the nuclide and the dose is composed of a GEM detector 100, a transfer unit 300, and an analysis unit (Readout Electronics, 400).
  • the GEM detector 100 is shielded with lead, and is composed of, for example, about 30 to 40 GEM modules (Module, 200), and each GEM module 200 is a device for detecting radiation from a food material. Each GEM module 200 is installed to be detachable from the GEM detector 100.
  • the GEM detector 100 has a GEM chamber (Chamber) for detecting radioactivity is provided in each module 200, and is connected to the GEM chamber and includes an analysis unit (Readout Electronics 400) for analyzing the detected radioactivity.
  • a GEM chamber Chamber
  • Readout Electronics 400 an analysis unit for analyzing the detected radioactivity.
  • FIG. 2 is a schematic diagram of a GEM chamber (Chamber) according to the present invention
  • FIG. 3 is a schematic diagram of an analysis unit (Readout Electronics) according to the present invention.
  • the conversion-Drift region contains argon (Ar) and carbon dioxide (CO 2 ) gas, these gases (radiation) through the incident window (Window) or The ionization electrons are released by colliding with electrons generated by the photoelectric effect in the incident window.
  • the photoelectric effect does not occur much, but when the energy of the incident radiation is small, the photoelectric effect occurs a lot.
  • Gamma rays have a shorter wavelength and larger frequency than x-rays, so the energy is large. Therefore, the photoelectric effect in x-rays is higher than gamma rays.
  • GEM foils are placed several millimeters apart in two layers, with a large potential difference across the GEM foil, making the electrons faster.
  • Electron Avalanche causes the electron's signal to amplify approximately 1000 to 10,000 times per GEM foil.
  • the electron signal is amplified approximately 10 6 ⁇ 10 8 times, collected at the anode, and transmitted to the analysis unit (Readout Electronics, 400).
  • the analyzer 400 converts the electrical signal into a voltage signal through a preamp and amplifies the signal ( ⁇ 10 5 times). Among the amplified voltage signals, noise and noise are filtered through a high-pass filter, and the filtered voltage signals are amplified again through the main amplifier ( ⁇ 10 4 ) and transferred to the AD converter.
  • the AD converter converts the pulse signal into a digital signal and sends it to the data acquisition unit (DAQ, 410), and the signal passing through the data acquisition unit (DAQ, 410) is transmitted through the software of the computer (PC, 490). The size of the screen will be displayed.
  • the computer PC 490 sets the magnitude of the voltage signal converted into an electrical signal on the x-axis, and displays the number of detections per voltage signal on the y-axis. This displayed graph is called crest distribution, and the graph corresponding to crest distribution has a unique graph for each radioactive substance. First, a crest distribution of radioactive substances detected as a standard is stored.
  • the operation of the radioactive material detection device of the food material using the gas electron amplifier according to the present invention configured as described above is as follows.
  • FIG 4 is a schematic diagram of a radioactive material detection device of the food material using a gas electron amplifier according to the present invention, as shown in Figure 4, the GEM detector 200 located in the conveyor belt 310 of the transfer unit 300 of the present invention ) Is shielded with lead through the shield 110, the food is moved in a plastic container of various sizes.
  • the food material contained in the plastic container is measured on the mass of the balance 32 located on the conveyor belt 310, the information on the measured mass is transmitted to the computer 490, and triggers the transmitted information (Trigger) signal As a result, the computer 490 operates the conveyor belt 310 to move the foodstuff to the point where the GEM detector 200 is located.
  • a CCD camera 330 is installed and the food is captured by the CCD camera 330, the CCD camera 330 transmits this information to the computer 490.
  • the computer 490 stops the operation of the conveyor belt unit 310 to stop the transport of the food material and starts the GEM detector 200 to start measuring the radioactivity of the food material. At this time, for example, if the food material had 100 Bq of radiation, it would emit 6000 radiation per minute, and if one quarter of them entered the GEM detector 200, 1500 radiation would enter the GEM detector 200.
  • the present invention uses a gas electron amplifier for ionizing electrons in the internal filling gas or ionizing electrons in the internal filling gas directly generated by the incident charged particles.
  • the conventional radiation detector By measuring the nuclide and the dose by amplifying through the avalanche in the GEM hole, the conventional radiation detector has the disadvantages of the GM gas tube method that can measure only the dose and the scintillator method that can measure only the ingredients processed in powder form. It will be possible to improve.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Food Science & Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measurement Of Radiation (AREA)

Abstract

La présente invention concerne un appareil de détection de produits alimentaires radioactifs à l'aide d'un multiplicateur d'électrons en phase gazeuse (GEM). Plus précisément, la présente invention concerne un appareil de détection de produits alimentaires radioactifs au moyen d'un multiplicateur d'électrons en phase gazeuse, l'appareil comprenant: un détecteur GEM qui comprend une partie de conversion photoélectrique, une partie de multiplication d'électrons en phase gazeuse, et une partie de sortie, la partie de conversion photoélectrique convertissant un rayonnement d'entrée en photoélectrons ou en électrons Compton, la partie de multiplication d'électrons en phase gazeuse recevant et multipliant les photoélectrons ou les électrons Compton convertis par la partie de conversion photoélectrique, et la partie de sortie recevant un signal électrique correspondant à l'emplacement où un nuage électronique multiplié par la partie de multiplication d'électrons en phase gazeuse a atteint une anode, déterminant la taille du nuage électronique, et le sortant; une partie de transport qui déplace un produit alimentaire vers la position où le détecteur GEM est installé; et une partie d'analyse (électronique de lecture) qui multiplie et convertit un signal électrique produit par le détecteur GEM afin d'analyser le radionucléide et la dose de rayonnement.
PCT/KR2016/014381 2016-02-23 2016-12-08 Appareil de détection de produits alimentaires radioactifs à l'aide d'un multiplicateur d'électrons en phase gazeuse WO2017146361A1 (fr)

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KR20160021161 2016-02-23
KR10-2016-0021161 2016-02-23

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WO2017146361A1 true WO2017146361A1 (fr) 2017-08-31

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170092080A1 (en) * 2011-12-08 2017-03-30 Nec Platforms, Ltd. Point-of-sale system that measures radioactivity of a product
CN108160528A (zh) * 2017-12-28 2018-06-15 安徽宏实光机电高科有限公司 一种具有云服务鉴别功能的色选机块状物料剔除装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100716495B1 (ko) * 2005-11-23 2007-05-10 창원대학교 산학협력단 기체전자증폭기를 이용한 디지털 영상 광 검출장치
KR20070063916A (ko) * 2005-12-16 2007-06-20 한창희 일차원 기체전자증폭 디지털 영상화 방사선 검출장치 및 그제어방법
JP2013072814A (ja) * 2011-09-28 2013-04-22 Anritsu Sanki System Co Ltd 放射線検査装置
KR20150016796A (ko) * 2013-08-05 2015-02-13 한국원자력연구원 방사선 검역 시스템 및 검역 방법
JP2015155926A (ja) * 2015-06-04 2015-08-27 株式会社島津製作所 食品放射能スクリーニング検査装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100716495B1 (ko) * 2005-11-23 2007-05-10 창원대학교 산학협력단 기체전자증폭기를 이용한 디지털 영상 광 검출장치
KR20070063916A (ko) * 2005-12-16 2007-06-20 한창희 일차원 기체전자증폭 디지털 영상화 방사선 검출장치 및 그제어방법
JP2013072814A (ja) * 2011-09-28 2013-04-22 Anritsu Sanki System Co Ltd 放射線検査装置
KR20150016796A (ko) * 2013-08-05 2015-02-13 한국원자력연구원 방사선 검역 시스템 및 검역 방법
JP2015155926A (ja) * 2015-06-04 2015-08-27 株式会社島津製作所 食品放射能スクリーニング検査装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170092080A1 (en) * 2011-12-08 2017-03-30 Nec Platforms, Ltd. Point-of-sale system that measures radioactivity of a product
US9905087B2 (en) * 2011-12-08 2018-02-27 Nec Platforms, Ltd. Point-of-sale system that measures radioactivity of a product
CN108160528A (zh) * 2017-12-28 2018-06-15 安徽宏实光机电高科有限公司 一种具有云服务鉴别功能的色选机块状物料剔除装置

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