# US 11,029,420 B2 · Ionizing radiation detecting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,029,420 B2 - Document ID: US11029420B2 - Status: Granted - Kind: B2 - Application number: 16/830,522 - Filed: 2020-03-26 - Published: 2020-09-10 - Granted: 2021-06-08 - Earliest claimed: 2015-03-02 - Applicants: Beamocular AB - Inventors: Kristofer Maad; Mauritz Andersson - Web page: https://patentgrep.com/patent/US11029420B2 ## CPC - G01T 1/185: with ionisation chamber arrangements - G01T 1/17: Circuit arrangements not adapted to a particular type of detector {(pulse-selection circuits H03K, G01R)} - G01T 1/2935: {using ionisation detectors} - G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00) ## Abstract The invention relates to a detecting unit for detecting ionizing radiation. The device comprises a converter unit for the amplification of ionizing radiation and a read-out unit, wherein the converter unit comprises a converter and a gas-electron multiplier, wherein said converter comprises a substrate with an ionizing radiation-receiving major surface and an electron-emitting major surface and a stack of accelerator plates in contact with the electron-emitting major side, wherein said stack comprises a plurality of perforated accelerator plates wherein the perforations of the perforated accelerator plates are aligned to form a matrix of blind holes. ## Claims ### Claim 1 Detecting device for detecting ionizing radiation comprising a converter unit for amplifying electrons emitted due to ionizing radiation and a read-out unit, wherein the converter unit comprises a converter and a gas-electron multiplier, wherein said converter comprises a substrate with an ionizing radiation-receiving major surface and an electron-emitting major surface and a stack of accelerator plates in contact with the electron-emitting major surface, wherein said stack comprises a plurality of perforated accelerator plates wherein perforations of the perforated accelerator plates are aligned with each other and are distributed to form a matrix of blind holes; wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein said groups are aligned with a respective blind hole. ### Claim 2 (depends on 1) Detecting device according to claim 1 wherein the gas-electron multiplier comprises a first major surface and a second major surface made of a conducting material and wherein at least one of said first and second major surfaces is formed as a plurality of electrically unconnected regions. ### Claim 3 (depends on 1) Detecting device according to claim 1 wherein the gas-electron multiplier comprises a first major surface and a second major surface made of a conducting material and wherein both of said first and second major surfaces are formed as a plurality of electrically unconnected regions. ### Claim 4 (depends on 1) Detecting device according to claim 1 wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein a minimum radial distance between a circumference of a blind hole and a closest point of the circumference of a GEM through hole is equal to or greater than 40 μm. ### Claim 5 (depends on 1) Detecting device according to claim 1 wherein the diameter of each blind hole is equal to or greater than 0.3 mm and less than or equal to 0.5 mm. ### Claim 6 (depends on 1) Detecting device according to claim 1 wherein the gas-electron multiplier comprises a first major surface and a second major surface made of a conducting material and wherein at least one of said first and second major surfaces is formed as a plurality of electrically unconnected regions. ### Claim 7 (depends on 1) Detecting device according to claim 1 wherein the gas-electron multiplier comprises a first major surface and a second major surface made of a conducting material and wherein both of said first and second major surfaces are formed as a plurality of electrically unconnected regions. ### Claim 8 (depends on 1) Detecting device according to claim 1 wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein a minimum radial distance between a circumference of a blind hole and a closest point of the circumference of a GEM through hole is equal to or greater than 40 μm. ### Claim 9 (depends on 1) Detecting device according to claim 1 wherein the diameter of each blind hole is equal to or greater than 0.3 mm and less than or equal to 0.5 mm. ### Claim 10 Converter unit comprising a converter and a gas-electron multiplier, wherein said converter comprises a substrate with an ionizing radiation-receiving major surface and an electron-emitting major surface and a stack of accelerator plates in contact with the electron-emitting major surface, wherein said stack comprises a plurality of perforated accelerator plates, wherein perforations of the perforated accelerator plates are aligned to form a matrix of blind holes, and wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein said groups are aligned with a respective blind hole. ### Claim 11 (depends on 10) Converter unit according to claim 10 wherein a surface of each blind hole is covered with an insulator except for a portion which is exposed in order to be able to attract and neutralize ions. ### Claim 12 (depends on 11) Converter unit according to claim 11 wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein a minimum radial distance between a circumference of a blind hole and a closest point of a circumference of a GEM through hole is equal to or greater than 20 μm. ### Claim 13 (depends on 11) Converter unit according to claim 11 wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein a minimum radial distance between a circumference of a blind hole and a closest point of a circumference of a GEM through hole is equal to or greater than 40 μm. ### Claim 14 (depends on 11) Converter unit according to claim 11 wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein a minimum radial distance between a circumference of a blind hole and a closest point of a circumference of a GEM through hole is equal to or greater than 50 μm. ### Claim 15 (depends on 10) Converter unit according to claim 10 wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein a minimum radial distance between a circumference of a blind hole and a closest point of a circumference of a GEM through hole is equal to or greater than 20 μm. ### Claim 16 (depends on 10) Converter unit according to claim 10 wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein a minimum radial distance between a circumference of a blind hole and a closest point of a circumference of a GEM through hole is equal to or greater than 40 μm. ### Claim 17 (depends on 10) Converter unit according to claim 10 wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein a minimum radial distance between a circumference of a blind hole and a closest point of a circumference of a GEM through hole is equal to or greater than 50 μm. ### Claim 18 Converter for converting ionizing radiation wherein said converter comprises a substrate with an ionizing radiation-receiving major surface and an electron-emitting major surface and a stack of accelerator plates in contact with the electron-emitting major surface, wherein said stack comprises a plurality of perforated accelerator plates wherein perforations of the perforated accelerator plates are aligned to form a matrix of blind holes, and wherein said gas-electron multiplier comprises a matrix formed of a plurality of groups of GEM through holes wherein said groups are aligned with a respective blind hole. ### Claim 19 (depends on 18) Converter according to claim 18 wherein a surface of each blind hole is covered with an insulator except for a portion which is exposed in order to be able to attract and neutralize ions.