# US 2018/0321418 A1 · Article including a body including a fluorescent material and a wavelength shifting fiber, a radiation detector including the article, and a method of using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0321418 A1 - Document ID: US20180321418A1 - Status: Published application - Kind: A1 - Application number: 15/969,410 - Filed: 2018-05-02 - Published: 2018-11-08 - Earliest claimed: 2017-05-08 - Assignees: Saint-Gobain Ceramics & Plastics, Inc. - Applicants: Saint-Gobain Ceramics & Plastics, Inc. - Inventors: Michael R. KUSNER; Peter R. MENGE - Web page: https://patentgrep.com/patent/US20180321418A1 ## CPC - G01V 5/26: Passive interrogation, i.e. by measuring radiation emitted by objects or goods - G01T 1/2006: {using a combination of a scintillator and photodetector which measures the means radiation intensity} - G01T 1/28: with secondary-emission detectors - G01T 5/08: Scintillation chambers (discharge tubes H01J40/00, H01J47/00) - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) - 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 An article can include a body including a fluorescent material and a wavelength shifting fiber. In an embodiment, the fiber can have a cross-sectional dimension of at least 1.5 mm, and outer dimensions of the body define a volume of at least 5 liters. In another embodiment, the article can include wavelength shifting fibers organized in at least two rows and at least columns. In another aspect, a radiation detector can include a body including a fluorescent material; a wavelength shifting fiber having a cross-sectional area; and a photosensor including a light-receiving surface having a light-receiving area of at least 9 mm2, wherein the cross-sectional area of the wavelength shifting fiber is at least 25% of the light-receiving area. The article and radiation detector are well suited for relatively large radiation detectors that have bodies with relatively short attenuation lengths. ## Claims ### Claim 1 An article comprising: a body including a fluorescent material, wherein the body is monolithic; and a first wavelength shifting fiber having a cross-sectional dimension of at least 1.5 mm, wherein outer dimensions of the body define a volume of at least 5 liters. ### Claim 2 (depends on 1) The article of claim 1, wherein the outer dimensions of the body define the volume of at least 11 liters. ### Claim 3 (depends on 1) The article of claim 1, wherein the body comprises: a first dimension of at least 2 cm; a second dimension of at least 50 cm; an attenuation length of at most 1000 cm; and a corresponding light collection efficiency of at least 0.8%. ### Claim 4 (depends on 1) The article of claim 1, wherein the fluorescent material comprises organic scintillation molecules. ### Claim 5 (depends on 4) The article of claim 4, wherein the organic scintillation molecules comprises 0.11 wt. % of a mass of the body. ### Claim 6 (depends on 1) The article claim 1, wherein the first wavelength shifting fiber having a cross-sectional dimension of at least 3 mm. ### Claim 7 (depends on 1) The article of claim 1, wherein the body comprises: a first dimension of at least 2 cm; a second dimension of at least 50 cm; an attenuation length of at most 350 cm; and a corresponding light collection efficiency of at least 3%. ### Claim 8 (depends on 1) The article of claim 1, wherein the body further comprises 6Li, 10B, or Gd. ### Claim 9 (depends on 1) The article of claim 1, further comprising a second wavelength shifting fiber, wherein the second wavelength shifting fiber comprises a cross-sectional dimension of at least 4 mm. ### Claim 10 A radiation detector comprising: a body comprising a fluorescent material; at least two wavelength shifting fibers, wherein a first wavelength shifting fiber has a first cross-sectional area; and at least two photosensors, wherein a first photosensor comprises a light-receiving surface having a first light-receiving area of at least 9 mm2, wherein the first cross-sectional area of the first wavelength shifting fiber is at least 25% of the first light-receiving area. ### Claim 11 (depends on 10) The radiation detector of claim 10, wherein the first cross-sectional area of the first wavelength shifting fiber is at least 40% of the first light-receiving area. ### Claim 12 (depends on 10) The radiation detector of claim 10, wherein each of the at least two photosensors is optically coupled to at least one wavelength shifting fiber. ### Claim 13 (depends on 12) The radiation detector of claim 12, wherein each wavelength shifting fiber is optically coupled to two photosensors. ### Claim 14 (depends on 10) The radiation detector of claim 10, wherein the first wavelength shifting fiber comprises a cross-sectional dimension of at least 5 mm. ### Claim 15 (depends on 10) The radiation detector of claim 10, further comprising a second wavelength shifting fiber and wherein the second wavelength shifting fiber comprises a cross-sectional dimension of at least 5 mm. ### Claim 16 (depends on 10) The radiation detector of claim 10, wherein the body comprises: a first dimension of at least 2 cm; a second dimension of at least 50 cm; an attenuation length of at most 1000 cm; and a corresponding light collection efficiency of at least 0.8%. ### Claim 17 (depends on 10) The radiation detector of claim 10, wherein the fluorescent material comprises solid particles. ### Claim 18 (depends on 10) The radiation detector of claim 10, wherein the body further comprises 6Li, 10B, or Gd. ### Claim 19 (depends on 16) The radiation detector of claim 16, wherein the solid particles are at least 0.11 wt. % of a mass of the body. ### Claim 20 A method of detecting a radioactive material, the method comprising: scanning a vehicles or a cargo for a radioactive material using an article, the article comprising: a body including a fluorescent material, wherein the body is monolithic; and a first wavelength shifting fiber having a cross-sectional dimension of at least 1.5 mm, wherein outer dimensions of the body define a volume of at least 5 liters.