WO2023095576A1 - 放射線検出装置 - Google Patents

放射線検出装置 Download PDF

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Publication number
WO2023095576A1
WO2023095576A1 PCT/JP2022/040932 JP2022040932W WO2023095576A1 WO 2023095576 A1 WO2023095576 A1 WO 2023095576A1 JP 2022040932 W JP2022040932 W JP 2022040932W WO 2023095576 A1 WO2023095576 A1 WO 2023095576A1
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WIPO (PCT)
Prior art keywords
radiation detection
electrode
substrate
detection apparatus
radiation
Prior art date
Application number
PCT/JP2022/040932
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English (en)
French (fr)
Japanese (ja)
Inventor
博士 伊藤
宏尚 石浦
Original Assignee
学校法人東京理科大学
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Application filed by 学校法人東京理科大学 filed Critical 学校法人東京理科大学
Priority to JP2023563590A priority Critical patent/JPWO2023095576A1/ja
Publication of WO2023095576A1 publication Critical patent/WO2023095576A1/ja

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G01T1/18—Measuring radiation intensity with counting-tube arrangements, e.g. with Geiger counters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J47/00—Tubes for determining the presence, intensity, density or energy of radiation or particles

Definitions

  • the present invention relates to a radiation detection device.
  • TPC Time Projection Chamber
  • GEM gas electron multiplier
  • ⁇ -PIC micro-pixel chamber
  • the present invention has been made in view of the above points, and it is an object of the present invention to provide a radiation detection apparatus that suppresses expansion of the substrate area while increasing the effective area and effective volume.
  • a radiation detection apparatus includes an electrode to which a predetermined voltage is applied, an electron detector that detects electrons generated by interaction of radiation with a predetermined gas, the electrode and the electrons. and a resistor provided between the electrode and the detector, wherein the predetermined voltage applied to the electrode and the resistor form a concentric electric field between the electrode surface of the electrode and the electron detector. do.
  • a radiation detection apparatus is the radiation detection apparatus according to the first aspect, wherein the electron detector has a curved shape with a predetermined curvature.
  • a radiation detection apparatus is the radiation detection apparatus according to the first aspect, wherein the electron detector has a hemispherical shape.
  • a radiation detection apparatus is the radiation detection apparatus according to any one of the first to third aspects, wherein the length of the electrode in a direction orthogonal to a tangent line of the concentric circle is longer than the length of the electron detector in said direction.
  • a radiation detection apparatus is the radiation detection apparatus according to any one of the first to fourth aspects, wherein the electron detector detects trajectories of the electrons.
  • a radiation detection device is the radiation detection device according to any one of the first to fifth aspects, wherein the resistor is a sheet-like resistor.
  • a predetermined voltage and resistance applied to the electrode form a concentric electric field between the electrode surface of the electrode and the electron detector, thereby increasing the effective area and effective volume.
  • a radiation detection device that suppresses expansion of the substrate area.
  • FIG. 1 is a diagram showing a schematic configuration of a radiation detection system according to this embodiment
  • FIG. 1 is an external perspective view of a radiation detection apparatus according to this embodiment
  • FIG. It is a schematic diagram of a cross section of the side surface of the radiation detection apparatus according to the present embodiment.
  • FIG. 4 is a diagram showing an example of signal charge distribution when ⁇ -rays are incident on the radiation detection apparatus according to the present embodiment;
  • FIG. 1 is a diagram showing a schematic configuration of a radiation detection system according to this embodiment.
  • the radiation detection system 1 shown in FIG. 1 includes a radiation detection device 100, a processing device 200, and a display device 300.
  • the radiation detection apparatus 100 is a detection apparatus that detects radiation with an electron detector that detects electrons generated by interaction of radiation with a predetermined gas, and is a radiation gas track detection apparatus that uses TPC technology.
  • the radiation detection apparatus 100 uses the above-described GEM as an electron detector to detect the trajectory of radiation.
  • the GEM is excited by an electric field generated between an electrode to which a predetermined voltage is applied and the GEM by injecting charged particles into an inert gas such as argon, xenon, or tetrafluoromethane as the predetermined gas. Radiation can be detected using the signal produced when the electrons are amplified.
  • the processing device 200 executes processing on signals sent from the radiation detection device 100 .
  • the processing device 200 executes processing for detecting tracks of radiation using signals sent from the radiation detection device 100 .
  • the display device 300 displays information according to the processing executed by the processing device 200 .
  • the display device 300 displays radiation traces detected by the processing device 200 .
  • the radiation detection apparatus 100 generates a concentric electric field between the electrode surface of the electrode and the substrate in order to increase the effective area.
  • the electrode surface and the substrate have a curved shape with a predetermined curvature.
  • Such shapes include, for example, semi-cylindrical and hemispherical shapes.
  • the electrodes and substrate have a semi-cylindrical shape, as described below.
  • the radiation detection apparatus 100 forms a concentric electric field between the electrode surface of the electrode and the electron detector, thereby increasing the effective area and effective volume while suppressing the expansion of the substrate area. becomes possible. Details of the radiation detection apparatus 100 according to this embodiment will be described below.
  • FIG. 2 is an external perspective view of the radiation detection apparatus 100 according to this embodiment.
  • FIG. 3 is a schematic side cross-sectional view of the radiation detection apparatus 100 according to this embodiment.
  • the radiation detection apparatus 100 includes a substrate 110, which is an example of the electronic detector of the present invention, an electrode 120, and a resistor 130.
  • the substrate 110 is a substrate for detecting radiation trajectories using GEM, and is an example of the electron detector of the present invention. In this embodiment, it has a semi-cylindrical shape curved with a predetermined radius of curvature.
  • the substrate 110 is fixed to the frame by being aligned with the frame and pasted.
  • copper is vapor-deposited on the front and back surfaces of the film, and holes of a predetermined size are punched at predetermined intervals to form a mesh. configured to amplify electrons from.
  • the amplified electrons are received by the ⁇ -PIC to detect the two-dimensional hit positions of the electrons. Further, since a signal is generated from the substrate 110 as electrons are amplified, the signal is used as a signal for determining whether or not radiation is detected.
  • the electrode 120 is an electrode that forms an electric field with the substrate 110 .
  • the electrode 120 has a semi-cylindrical shape curved with a predetermined radius of curvature like the substrate 110 .
  • Resistor 130 is a resistor that creates a potential difference between substrate 110 and electrode 120 to generate an electric field between substrate 110 and electrode 120 .
  • the resistor 130 is, for example, a sheet-like resistor.
  • a voltage is applied to the electrode 120 from a power source (not shown).
  • the radiation detection apparatus 100 When radiation such as ⁇ -rays is incident from the electrode 120, the ⁇ -rays react with gas to generate electrons. The generated electrons move toward the substrate 110 due to the electric field generated between the substrate 110 and the electrode 120 . By receiving the electrons generated by the incidence of ⁇ -rays on the substrate 110, the radiation detection apparatus 100 according to the present embodiment can detect the incidence of ⁇ -rays and the trajectory of the incident ⁇ -rays.
  • the substrate 110 has a curved shape with a predetermined curvature, so the curvature of the substrate 110 is taken into account when calculating the trajectory of incident ⁇ -rays. There is a need.
  • the radiation detecting apparatus 100 Since the substrate 110 and the electrode 120 have a curved semi-cylindrical shape, the radiation detecting apparatus 100 according to the present embodiment has a gap between the substrate 110 and the electrode surface of the electrode 120 shown in FIG. As seen from the side, a concentric electric field E can be generated. By generating the concentric electric field E, even if the area of the substrate 110 is the same, it is possible to increase the effective area and the effective volume compared to the case of a flat plate.
  • the length of the electrode 120 in the direction perpendicular to the tangent line of the concentric circle of the electric field E may be longer than the length of the substrate 110 in that direction.
  • the substrate 110 is square and the length l of one side is 10 cm.
  • the distance from the center of the arc of the substrate 110 to the electrode 120 is R
  • FIG. 4 is a diagram showing an example of signal charge distribution when ⁇ -rays are incident on the radiation detection apparatus 100 according to this embodiment.
  • the signal charge distribution when the radiation detection apparatus 100 contains an ⁇ -ray source increases with a statistically significant difference of 4.3 sigma compared to when it does not. This means that there is a 99.9983% chance that the difference between the case where the radiation detection apparatus 100 has an ⁇ -ray source and the case where it does not is not accidental. Therefore, it can be seen that the radiation detection apparatus 100 according to this embodiment can detect the tracks of ⁇ -rays.
  • the radiation detection apparatus 100 according to this embodiment can suppress expansion of the substrate area while increasing the effective area. Therefore, the radiation detection system 1 including the radiation detection apparatus 100 according to this embodiment can increase the radiation detection sensitivity as compared with the conventional system. Moreover, the radiation detection apparatus 100 according to the present embodiment can be applied not only to the analysis of alpha rays but also to everything using the TPC technique.
  • a gas track detector based on TPC technology can reconstruct the three-dimensional track of charged particles and is applied in fields such as the environment, medicine, space, and materials.
  • the radiation detection apparatus 100 forms a concentric electric field by bending a substrate such as GEM or ⁇ -PIC, and can contribute to a dramatic improvement in effective area and effective volume.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Measurement Of Radiation (AREA)
PCT/JP2022/040932 2021-11-25 2022-11-01 放射線検出装置 WO2023095576A1 (ja)

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JP2021191168 2021-11-25
JP2021-191168 2021-11-25

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS559113A (en) * 1978-07-06 1980-01-23 Rigaku Denki Kk Apparatus for detecting raiant ray incidence position
JP2001508935A (ja) * 1997-10-22 2001-07-03 ヨーロピアン オーガナイゼイション フォー ニュークリア リサーチ 非常に高性能な放射線検出器と、このような放射線検出器を含む視差のない平面天球型ｘ線イメージ装置
JP2002082170A (ja) * 2000-09-07 2002-03-22 Aloka Co Ltd 電離箱型放射線検出装置及び電離箱検査方法
JP2004020249A (ja) * 2002-06-13 2004-01-22 Toshiba Corp 放射線検出装置
JP2008243634A (ja) * 2007-03-28 2008-10-09 High Energy Accelerator Research Organization ガス放射線検出器
JP2016118426A (ja) * 2014-12-19 2016-06-30 キヤノン株式会社 放射線計測装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS559113A (en) * 1978-07-06 1980-01-23 Rigaku Denki Kk Apparatus for detecting raiant ray incidence position
JP2001508935A (ja) * 1997-10-22 2001-07-03 ヨーロピアン オーガナイゼイション フォー ニュークリア リサーチ 非常に高性能な放射線検出器と、このような放射線検出器を含む視差のない平面天球型ｘ線イメージ装置
JP2002082170A (ja) * 2000-09-07 2002-03-22 Aloka Co Ltd 電離箱型放射線検出装置及び電離箱検査方法
JP2004020249A (ja) * 2002-06-13 2004-01-22 Toshiba Corp 放射線検出装置
JP2008243634A (ja) * 2007-03-28 2008-10-09 High Energy Accelerator Research Organization ガス放射線検出器
JP2016118426A (ja) * 2014-12-19 2016-06-30 キヤノン株式会社 放射線計測装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FENKER, H. ; BAILLIE, N. ; BRADSHAW, P. ; BUELTMANN, S. ; BURKERT, V. ; CHRISTY, M. ; DODGE, G. ; DUTTA, D. ; ENT, R. ; EVANS, J. : "BoNus: Development and use of a radial TPC using cylindrical GEMs", NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ELSEVIER BV * NORTH-HOLLAND, NL, vol. 592, no. 3, 21 July 2008 (2008-07-21), NL , pages 273 - 286, XP022831720, ISSN: 0168-9002, DOI: 10.1016/j.nima.2008.04.047 *

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