# US 11,307,311 B2 · Gamma ray and neutron dosimeter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,311 B2 - Document ID: US11307311B2 - Status: Granted - Kind: B2 - Application number: 16/660,334 - Filed: 2019-10-22 - Published: 2020-04-23 - Granted: 2022-04-19 - Earliest claimed: 2018-10-23 - Assignees: Thermo Fisher Scientific Messtechnik GmbH - Applicants: Thermo Fisher Scientific Messtechnik GmbH - Inventors: Erich Leder; Michael Iwatschenko-Borho; Norbert Trost; Reinhard Buchhold - Web page: https://patentgrep.com/patent/US11307311B2 ## CPC - G01T 1/023: {Scintillation dose-rate meters} - G01T 3/06: with scintillation 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 A dosimeter includes a housing and a printed circuit board positioned within the housing. A silicon photomultiplier is operably connected to the printed circuit board. A scintillator formed of Ce-activated lithium aluminosilicate glass is positioned on the silicon photomultiplier. An optical coupling is positioned between the scintillator and the silicon photomultiplier, and an optical reflector surrounds the scintillator. ## Claims ### Claim 1 A dosimeter comprising: a housing; a printed circuit board positioned within the housing; a silicon photomultiplier operably connected to the printed circuit board; a scintillator formed of a Ce-activated lithium aluminosilicate glass powder and positioned on the silicon photomultiplier, wherein the scintillator comprises a glue distributed throughout the Ce-activated lithium aluminosilicate glass powder to secure particles together and to the silicon photomultiplier, and further wherein the distribution of the glue comprises an optical coupling between the scintillator and the silicon photomultiplier; and an optical reflector surrounding the scintillator. ### Claim 2 (depends on 1) The dosimeter of claim 1, wherein the scintillator comprises Ce-activated lithium aluminosilicate glass in a block form. ### Claim 3 (depends on 2) The dosimeter of claim 2, wherein a surface of the block form facing the silicon photomultiplier is polished. ### Claim 4 (depends on 2) The dosimeter of claim 2, wherein a plurality of surfaces of the block form are painted white. ### Claim 5 (depends on 1) The dosimeter of claim 1, wherein the optical reflector comprises a reflective container substantially surrounding the powder form of the Ce-activated lithium aluminosilicate glass. ### Claim 6 (depends on 5) The dosimeter of claim 5, wherein the optical reflector comprises a reflective cap secured about an opening of the container. ### Claim 7 (depends on 1) The dosimeter of claim 1, wherein a refractive index of the glue is approximately equal to a refractive index of the scintillator. ### Claim 8 (depends on 1) The dosimeter of claim 1, wherein the optical reflector is formed of polytetrafluoroethylene. ### Claim 9 (depends on 1) The dosimeter of claim 1, wherein the optical reflector comprises a tape form. ### Claim 10 (depends on 1) The dosimeter of claim 1, wherein the housing is formed of aluminum. ### Claim 11 (depends on 1) The dosimeter of claim 1, further comprising a filter surrounding the scintillator and the silicon photomultiplier. ### Claim 12 (depends on 11) The dosimeter of claim 11, wherein the filter is formed of gadolinium. ### Claim 13 (depends on 11) The dosimeter of claim 11, wherein the filter includes a plurality of apertures extending therethrough. ### Claim 14 (depends on 1) The dosimeter of claim 1, wherein the housing is sealed with an epoxy sealant. ### Claim 15 (depends on 14) The dosimeter of claim 14, wherein the epoxy sealant is black. ### Claim 16 (depends on 1) The dosimeter of claim 1, further comprising a cable operably connected to the printed circuit board and configured to supply power to the printed circuit board and provide digital data communication with the printed circuit board. ### Claim 17 A dosimeter comprising: a housing formed of metal; a printed circuit board positioned within the housing, a cable operably connected to the printed circuit board and configured to supply power to the printed circuit board and provide digital data communication with the printed circuit board; a silicon photomultiplier operably connected to the printed circuit board; a scintillator formed of a Ce-activated lithium aluminosilicate glass powder and positioned on the silicon photomultiplier, wherein the scintillator comprises a glue distributed throughout the Ce-activated lithium aluminosilicate glass powder to secure particles together and to the silicon photomultiplier, and further wherein the distribution of the glue comprises an optical coupling between the scintillator and the silicon photomultiplier; and an optical reflector surrounding the scintillator; and a gadolinium filter surrounding the scintillator and the photomultiplier. ### Claim 18 A dosimeter system comprising: a computer network including a plurality of computing devices; a plurality of dosimeters, each dosimeter comprising: a housing; a printed circuit board positioned within the housing and configured to communicate with the computer network; a silicon photomultiplier operably connected to the printed circuit board; a scintillator formed of a Ce-activated lithium aluminosilicate glass powder and positioned on the silicon photomultiplier, wherein the scintillator comprises a glue distributed throughout the Ce-activated lithium aluminosilicate glass powder to secure particles together and to the silicon photomultiplier, and further wherein the distribution of the glue comprises an optical coupling between the scintillator and the silicon photomultiplier; and an optical reflector surrounding the scintillator; and a plurality of repeaters configured to receive data from the dosimeters and transmit that data to the computer network.