Patents by Inventor Yoshiyuki Shirakawa
Yoshiyuki Shirakawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9488602Abstract: A radioactive substance detection device that detects a radioactive substance being present in a specified direction. A radiation detection element having a thickness that stops and detects a characteristic X-ray arriving from a radioactive substance being present in the specified direction that radiates both gamma rays and the characteristic X-rays, and allows the gamma ray arriving from the radioactive substance to pass through. A screening body having a thickness that screens out characteristic X-rays of radiation which arrives from directions other than the specified direction and allows gamma rays of radiation which arrives from directions other than the specified direction to pass through.Type: GrantFiled: January 12, 2013Date of Patent: November 8, 2016Assignee: National Institutes for Quantum and Radiological Science and TechnologyInventors: Shingo Kobayashi, Yukio Uchihori, Yoshiyuki Shirakawa
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Publication number: 20140299784Abstract: A radioactive substance detection device that detects a radioactive substance being present in a specified direction. A radiation detection element having a thickness that stops and detects a characteristic X-ray arriving from a radioactive substance being present in the specified direction that radiates both gamma rays and the characteristic X-rays, and allows the gamma ray arriving from the radioactive substance to pass through. A screening body having a thickness that screens out characteristic X-rays of radiation which arrives from directions other than the specified direction and allows gamma rays of radiation which arrives from directions other than the specified direction to pass through.Type: ApplicationFiled: January 12, 2013Publication date: October 9, 2014Applicant: National Institute of Radiological SciencesInventors: Shingo Kobayashi, Yukio Uchihori, Yoshiyuki Shirakawa
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Publication number: 20140166890Abstract: A resin for scintillators having high radiation sensitivity, which is obtained without using a wavelength conversion agent. The resin for the scintillator of a radiation detector contains a polyester having a unit represented by the following formula (1). (In the above formula (1), Ar is a naphthalenediyl group or an anthracenediyl group all of which may be substituted by an alkyl group having 1 to 6 carbon atoms or a halogen atom. X is an aliphatic hydrocarbon group having 2 to 20 carbon atoms, an alicyclic hydrocarbon group having 2 to 20 carbon atoms or an aromatic hydrocarbon group having 5 to 20 carbon atoms all of which may be substituted by an alkyl group having 1 to 6 carbon atoms or a halogen atom.Type: ApplicationFiled: February 2, 2012Publication date: June 19, 2014Applicants: NATIONAL INSTITUTE OF RADIOLOGICAL SCIENCES, TEIJIN LIMITEDInventors: Hisayoshi Shimizu, Fumio Murakawa, Zenichiro Shidara, Hidehito Nakamura, Yoshiyuki Shirakawa
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Patent number: 8106362Abstract: A surface contamination examining device includes a radiation detector 11 and an arithmetic/display device 13 for displaying radiation intensity in form of a counting rate. The arithmetic/display device has a boundary detecting device 10 that detects the boundary of contamination 14 of an object to be measured by a radioactive material while the radiation detector moves along a surface 18 of the object to be measured.Type: GrantFiled: March 30, 2007Date of Patent: January 31, 2012Assignee: National Institute of Radiological SciencesInventor: Yoshiyuki Shirakawa
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Patent number: 7735658Abstract: A classification apparatus including a magnetic stirrer composed of main body (1) and rotor (2) and, arranged on the main body of the magnetic stirrer, classification tube (3). The interior of the classification tube is provided with classification compartments (A-E) partitioned from each other by divider plates (5a-5b). The lowermost classification compartment (A) is furnished with gas emission conduit (7). In the classification compartment (A), the rotor (2) of the magnetic stirrer is arranged. From gas supply source (8), a high-pressure gas is fed into the gas emission conduit. By means of the gas emitted from the gas emission conduit, a vortex flow rising from the lowermost classification compartment sequentially toward higher classification compartments is generated in the classification tube.Type: GrantFiled: January 23, 2007Date of Patent: June 15, 2010Assignees: The Doshisha, Kyoto University, Fukujuen Co., Ltd.Inventors: Jusuke Hidaka, Shinzo Yoshikado, Yoshiyuki Shirakawa, Yoshiaki Ito, Kiyoshi Hayakawa, Yuuko Watanabe
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Patent number: 7734447Abstract: A radiation measuring device capable of identifying the incident direction of a radiation ray and energy (segmentation). The directivity characteristics of a plurality of detectors are different from each other. A plurality of energy segmentations are set respectively for a plurality of spectra corresponding to a plurality of detectors, and actual measurement ratio information (a plurality of actual measurement counting ratios) expressing the mutual ratio between integrated counting values for each energy segmentation is computed. The actual measurement ratio information is checked against a plurality of response functions, and, when the compatibility relation between specific actual measurement ratio information and specific theoretical ratio information is found, the incident direction of a radiation ray and an energy segmentation are identified based on that relation.Type: GrantFiled: November 27, 2006Date of Patent: June 8, 2010Assignees: National Institute of Radiological Science, Aloka Co., Ltd.Inventors: Yoshiyuki Shirakawa, Yusuke Kobayashi, Toshiya Yamano
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Patent number: 7723696Abstract: In a radiation detector, a response is approximated as a primary delay system, and when a time constant T indicating the characteristic of the response is known, a final response value N0 is forecasted from dose rates or counting rates N1 and N2 of two points in the initial or middle stage of response. When the time constant T is unknown, the final response value N0 is forecasted from dose rates or counting rates N1, N2, and N3 of three points in the initial or middle stage of response. Simultaneously, a time constant is obtained and the soundness of the radiation detector is also evaluated. Thereby, a dose rate in an existence field of radiation or a counting rate in an existence field of radioactive materials is quickly and accurately forecasted, whereby the measurement time is shortened.Type: GrantFiled: February 16, 2006Date of Patent: May 25, 2010Assignees: National Institute of Radiological Sciences, Amano & Associates, Inc.Inventors: Yoshiyuki Shirakawa, Hiro Amano
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Patent number: 7655912Abstract: A direction finding radiation detector for detecting the direction of incidence of radioactive rays, comprising: a plurality of scintillators (41, 42, 43) (101, 102, 103) made of the same material, being arranged to overlap circumferentially at least in part so that they are shadowed by each other from radioactive rays incident in circumferential directions and so that light emitted from one of the scintillators is not incident on the other scintillators; and photoreceptor devices (51, 52, 53) (111, 112, 113) having light receiving surfaces optically coupled to the respective scintillators, wherein a combination of proportions of radioactive rays incident directly on the respective scintillators and radioactive rays incident indirectly thereon, being shadowed by the other scintillators, varies with the direction of incidence circumferentially.Type: GrantFiled: January 10, 2006Date of Patent: February 2, 2010Assignees: National Institute of Radiological Sciences, Aloka Co., Ltd.Inventors: Yoshiyuki Shirakawa, Toshiya Yamano
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Publication number: 20090294669Abstract: A surface contamination examining device includes a radiation detector 11 and an arithmetic/display device 13 for displaying radiation intensity in form of a counting rate. The arithmetic/display device has a boundary detecting device 10 that detects the boundary of contamination 14 of an object to be measured by a radioactive material while the radiation detector moves along a surface 18 of the object to be measured.Type: ApplicationFiled: March 30, 2007Publication date: December 3, 2009Applicant: NATIONAL INSTITUTE OF RADIOLOGICAL SCIENCESInventor: Yoshiyuki Shirakawa
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Publication number: 20090271143Abstract: A radiation measuring device capable of identifying the incident direction of a radiation ray and energy (segmentation) The directivity characteristics of a plurality of detectors are different from each other. A plurality of energy segmentations are set respectively for a plurality of spectra corresponding to a plurality of detectors, and actual measurement ratio information (a plurality of actual measurement counting ratios) expressing the mutual ratio between integrated counting values for each energy segmentation is computed. The actual measurement ratio information is checked against a plurality of response functions, and, when the compatibility relation between specific actual measurement ratio information and specific theoretical ratio information is found, the incident direction of a radiation ray and an energy segmentation are identified based on that relation.Type: ApplicationFiled: November 27, 2006Publication date: October 29, 2009Applicants: NATIONAL INSTITUTE OF RADIOLOGICAL SCIENCES, ALOKA CO., LTD.Inventors: Yoshiyuki Shirakawa, Yusuke Kobayashi, Toshiya Yamano
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Publication number: 20090078619Abstract: A classification apparatus including a magnetic stirrer composed of main body (1) and rotor (2) and, arranged on the main body of the magnetic stirrer, classification tube (3). The interior of the classification tube is provided with classification compartments (A-E) partitioned from each other by divider plates (5a-5b). The lowermost classification compartment (A) is furnished with gas emission conduit (7). In the classification compartment (A), the rotor (2) of the magnetic stirrer is arranged. From gas supply source (8), a high-pressure gas is fed into the gas emission conduit. By means of the gas emitted from the gas emission conduit, a vortex flow rising from the lowermost classification compartment sequentially toward higher classification compartments is generated in the classification tube.Type: ApplicationFiled: January 23, 2007Publication date: March 26, 2009Applicants: THE DOSHISHA, Kyoto University, Fukujuen Co., Ltd.Inventors: Jusuke Hidaka, Shinzo Yoshikado, Yoshiyuki Shirakawa, Yoshiaki Ito, Kiyoshi Hayakawa, Yuuko Watanabe
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Publication number: 20090035439Abstract: A method capable of manufacturing, by using a ball mill apparatus, powdered tea having the same quality as that manufactured by using a millstone. By using the ball mill apparatus having synthetic resin pots, a powdered tea material and synthetic resin balls are sealed in the pot, and the pot is revolved or revolved and rotated on its axis to crush the powdered tea material.Type: ApplicationFiled: March 31, 2006Publication date: February 5, 2009Inventors: Jusuke Hidaka, Shinzo Yoshikado, Yoshiyuki Shirakawa, Yoshiaki Ito, Kiyoshi Hayakawa, Yuuko Watanabe
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Publication number: 20080272305Abstract: In a radiation detector, a response is approximated as a primary delay system, and when a time constant T indicating the characteristic of the response is known, a final response value N0 is forecasted from dose rates or counting rates N1 and N2 of two points in the initial or middle stage of response. When the time constant T is unknown, the final response value N0 is forecasted from dose rates or counting rates N1, N2, and N3 of three points in the initial or middle stage of response. Simultaneously, a time constant is obtained and the soundness of the radiation detector is also evaluated. Thereby, a dose rate in an existence field of radiation or a counting rate in an existence field of radioactive materials is quickly and accurately forecasted, whereby the measurement time is shortened.Type: ApplicationFiled: February 16, 2006Publication date: November 6, 2008Applicants: National Institute of Radiological Sciences, Amano & Associates, Inc.Inventors: Yoshiyuki Shirakawa, Hiro Amano
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Publication number: 20070221854Abstract: A direction finding radiation detector for detecting the direction of incidence of radioactive rays, comprising: a plurality of scintillators (41, 42, 43) (101, 102, 103) made of the same material, being arranged to overlap circumferentially at least in part so that they are shadowed by each other from radioactive rays incident in circumferential directions and so that light emitted from one of the scintillators is not incident on the other scintillators; and photoreceptor devices (51, 52, 53) (111, 112, 113) having light receiving surfaces optically coupled to the respective scintillators, wherein a combination of proportions of radioactive rays incident directly on the respective scintillators and radioactive rays incident indirectly thereon, being shadowed by the other scintillators, varies with the direction of incidence circumferentially.Type: ApplicationFiled: January 10, 2006Publication date: September 27, 2007Applicant: Aloka Co., LtdInventor: Yoshiyuki Shirakawa