The Experts below are selected from a list of 201 Experts worldwide ranked by ideXlab platform
Koji Takasaki - One of the best experts on this subject based on the ideXlab platform.
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Spectroscopic Measurements of L X-rays with a TES Microcalorimeter for a Non-destructive Assay of Transuranium Elements
Journal of Low Temperature Physics, 2018Co-Authors: Keisuke Nakamura, Koji Takasaki, Yuki Morishita, Keisuke Maehata, Tetsuya Sugimoto, Yu Kiguchi, Naoko Iyomoto, Kazuhisa MitsudaAbstract:Spectroscopic measurement of the L X-rays emitted from Transuranium Elements is one of the most useful techniques for the non-destructive assays of nuclear materials. In this study, we fabricated a transition-edge-sensor (TES) microcalorimeter using a 5-μm-thick Au absorber and tested its ability to measure the L X-rays emitted from two Transuranium Elements, Np-237 and Cm-244 sources. The microcalorimeter was found to successfully measure the L X-rays with an energy resolution (full width at half maximum) below 70 eV. These results confirm that L X-rays can be identified using the proposed TES microcalorimeter to enable non-destructive assays of Transuranium Elements.
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Development of a microcalorimeter with transition edge sensor for detection of LX rays emitted by Transuranium Elements
Radiation Protection Dosimetry, 2011Co-Authors: Keisuke Nakamura, KUNIAKI ISHIBASHI, Takahiro Umeno, Kimihiko Maehata, Takashi Yasumune, Koji Takasaki, Makoto Maeda, Keiichi Tanaka, Takumaro MomoseAbstract:A transition edge sensor (TES) microcalorimeter has been developed for use as an energy dispersive X-ray spectrometer. The TES microcalorimeter is a thermal detector that enables one to determine the energy of an incident photon by measuring the resultant increase in temperature. In this work, a Ti/Au TES microcalorimeter was developed to measure LX rays emitted by Transuranium Elements. The phase transition temperature was set at ∼200 mK by using a bilayer structure composed of a 110-nm-thick Au layer and a 40-nm-thick Ti layer. An Au of 5 µm thickness was deposited on the Ti/Au bilayer to achieve an absorption efficiency of 35-80 % for the energy range of LX rays (10-25 keV). The developed TES microcalorimeter was irradiated with LX rays emitted by an (241)Am source at an operating temperature of 140 mK. An energy resolution of ∼80 eV (full width at the half maximum) was obtained for L(β1)X ray of 17.75 keV.
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development of a tes microcalorimeter for spectroscopic measurement of lx rays emitted by Transuranium Elements
Journal of Nuclear Science and Technology, 2010Co-Authors: Keisuke Maehata, Takashi Yasumune, Koji Takasaki, Keisuke Nakamura, Keiichi Tanaka, Kenji Ishibashi, Akikazu Odawara, Atsushi NagataAbstract:A phase transition edge sensor (TES) microcalorimeter was developed for the energy-dispersive measurement of LX-ray photons emitted by Transuranium Elements. The phase transition temperature of the TES was designed to be 200mK using a bilayer structure of Au of 120 nm thickness and Ti of 50 nm thickness. A Au layer of 5.0 mm thickness was deposited on the Au/Ti bilayer to achieve an absorption efficiency of 50% and counting rate of 100 counts per second in the detection of LX-ray photons with energy from 10 to 20 keV. The TES microcalorimeter was operated for the detection of LX-ray photons emitted by 241Am, 238Pu, and 239Pu sources. A decay time constant of 180 ms for the detection signal pulses allowed the TES microcalorimeter to operate with a counting rate higher than 100 counts per second. The achieved energy resolution was 50 eV for the full width at half maximum of a peak corresponding to a 237Np Lβ1 X-ray of 17.75 keV.
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Development of TES microcalorimeter for high precision spectroscopy of LX-ray photons emitted from Transuranium Elements
Journal of Nuclear Science and Technology, 2008Co-Authors: Katsunori Ueno, Takahiro Umeno, Keisuke Nakamura, Keiichi Tanaka, Keisuke Maehata, Akihiro Yamaguchi, Kenji Ishibashi, Koji TakasakiAbstract:A microcalorimeter with the superconducting transition edge sensor (TES) with a Au absorber of 5.0 μm thick was fabricated for the energy dispersive measurement of LX-ray photons emitted from Transuranium Elements. The TES microcalorimeter and a superconducting quantum interference device (SQUID) amplifier chips were cooled by operating a compact 3He-4He dilution refrigerator without consuming liquid helium by loading a Gifford-McMahon (GM) cooler. Since the cold stages of the GM cooler are tightly coupled to the heat exchangers of the dilution refrigerator, the TES and SQUID chips suffered from mechanical vibrations induced by a reciprocating motion of the displacer of the GM cooler. Detection signals of LX-ray photons emitted from an 241Am source were observed by operating the TES microcalorimeter in severe noise environment induced by mechanical vibrations.
Keisuke Nakamura - One of the best experts on this subject based on the ideXlab platform.
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Spectroscopic Measurements of L X-rays with a TES Microcalorimeter for a Non-destructive Assay of Transuranium Elements
Journal of Low Temperature Physics, 2018Co-Authors: Keisuke Nakamura, Koji Takasaki, Yuki Morishita, Keisuke Maehata, Tetsuya Sugimoto, Yu Kiguchi, Naoko Iyomoto, Kazuhisa MitsudaAbstract:Spectroscopic measurement of the L X-rays emitted from Transuranium Elements is one of the most useful techniques for the non-destructive assays of nuclear materials. In this study, we fabricated a transition-edge-sensor (TES) microcalorimeter using a 5-μm-thick Au absorber and tested its ability to measure the L X-rays emitted from two Transuranium Elements, Np-237 and Cm-244 sources. The microcalorimeter was found to successfully measure the L X-rays with an energy resolution (full width at half maximum) below 70 eV. These results confirm that L X-rays can be identified using the proposed TES microcalorimeter to enable non-destructive assays of Transuranium Elements.
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Development of a microcalorimeter with transition edge sensor for detection of LX rays emitted by Transuranium Elements
Radiation Protection Dosimetry, 2011Co-Authors: Keisuke Nakamura, KUNIAKI ISHIBASHI, Takahiro Umeno, Kimihiko Maehata, Takashi Yasumune, Koji Takasaki, Makoto Maeda, Keiichi Tanaka, Takumaro MomoseAbstract:A transition edge sensor (TES) microcalorimeter has been developed for use as an energy dispersive X-ray spectrometer. The TES microcalorimeter is a thermal detector that enables one to determine the energy of an incident photon by measuring the resultant increase in temperature. In this work, a Ti/Au TES microcalorimeter was developed to measure LX rays emitted by Transuranium Elements. The phase transition temperature was set at ∼200 mK by using a bilayer structure composed of a 110-nm-thick Au layer and a 40-nm-thick Ti layer. An Au of 5 µm thickness was deposited on the Ti/Au bilayer to achieve an absorption efficiency of 35-80 % for the energy range of LX rays (10-25 keV). The developed TES microcalorimeter was irradiated with LX rays emitted by an (241)Am source at an operating temperature of 140 mK. An energy resolution of ∼80 eV (full width at the half maximum) was obtained for L(β1)X ray of 17.75 keV.
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development of a tes microcalorimeter for spectroscopic measurement of lx rays emitted by Transuranium Elements
Journal of Nuclear Science and Technology, 2010Co-Authors: Keisuke Maehata, Takashi Yasumune, Koji Takasaki, Keisuke Nakamura, Keiichi Tanaka, Kenji Ishibashi, Akikazu Odawara, Atsushi NagataAbstract:A phase transition edge sensor (TES) microcalorimeter was developed for the energy-dispersive measurement of LX-ray photons emitted by Transuranium Elements. The phase transition temperature of the TES was designed to be 200mK using a bilayer structure of Au of 120 nm thickness and Ti of 50 nm thickness. A Au layer of 5.0 mm thickness was deposited on the Au/Ti bilayer to achieve an absorption efficiency of 50% and counting rate of 100 counts per second in the detection of LX-ray photons with energy from 10 to 20 keV. The TES microcalorimeter was operated for the detection of LX-ray photons emitted by 241Am, 238Pu, and 239Pu sources. A decay time constant of 180 ms for the detection signal pulses allowed the TES microcalorimeter to operate with a counting rate higher than 100 counts per second. The achieved energy resolution was 50 eV for the full width at half maximum of a peak corresponding to a 237Np Lβ1 X-ray of 17.75 keV.
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Development of TES microcalorimeter for high precision spectroscopy of LX-ray photons emitted from Transuranium Elements
Journal of Nuclear Science and Technology, 2008Co-Authors: Katsunori Ueno, Takahiro Umeno, Keisuke Nakamura, Keiichi Tanaka, Keisuke Maehata, Akihiro Yamaguchi, Kenji Ishibashi, Koji TakasakiAbstract:A microcalorimeter with the superconducting transition edge sensor (TES) with a Au absorber of 5.0 μm thick was fabricated for the energy dispersive measurement of LX-ray photons emitted from Transuranium Elements. The TES microcalorimeter and a superconducting quantum interference device (SQUID) amplifier chips were cooled by operating a compact 3He-4He dilution refrigerator without consuming liquid helium by loading a Gifford-McMahon (GM) cooler. Since the cold stages of the GM cooler are tightly coupled to the heat exchangers of the dilution refrigerator, the TES and SQUID chips suffered from mechanical vibrations induced by a reciprocating motion of the displacer of the GM cooler. Detection signals of LX-ray photons emitted from an 241Am source were observed by operating the TES microcalorimeter in severe noise environment induced by mechanical vibrations.
Keisuke Maehata - One of the best experts on this subject based on the ideXlab platform.
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Spectroscopic Measurements of L X-rays with a TES Microcalorimeter for a Non-destructive Assay of Transuranium Elements
Journal of Low Temperature Physics, 2018Co-Authors: Keisuke Nakamura, Koji Takasaki, Yuki Morishita, Keisuke Maehata, Tetsuya Sugimoto, Yu Kiguchi, Naoko Iyomoto, Kazuhisa MitsudaAbstract:Spectroscopic measurement of the L X-rays emitted from Transuranium Elements is one of the most useful techniques for the non-destructive assays of nuclear materials. In this study, we fabricated a transition-edge-sensor (TES) microcalorimeter using a 5-μm-thick Au absorber and tested its ability to measure the L X-rays emitted from two Transuranium Elements, Np-237 and Cm-244 sources. The microcalorimeter was found to successfully measure the L X-rays with an energy resolution (full width at half maximum) below 70 eV. These results confirm that L X-rays can be identified using the proposed TES microcalorimeter to enable non-destructive assays of Transuranium Elements.
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development of a tes microcalorimeter for spectroscopic measurement of lx rays emitted by Transuranium Elements
Journal of Nuclear Science and Technology, 2010Co-Authors: Keisuke Maehata, Takashi Yasumune, Koji Takasaki, Keisuke Nakamura, Keiichi Tanaka, Kenji Ishibashi, Akikazu Odawara, Atsushi NagataAbstract:A phase transition edge sensor (TES) microcalorimeter was developed for the energy-dispersive measurement of LX-ray photons emitted by Transuranium Elements. The phase transition temperature of the TES was designed to be 200mK using a bilayer structure of Au of 120 nm thickness and Ti of 50 nm thickness. A Au layer of 5.0 mm thickness was deposited on the Au/Ti bilayer to achieve an absorption efficiency of 50% and counting rate of 100 counts per second in the detection of LX-ray photons with energy from 10 to 20 keV. The TES microcalorimeter was operated for the detection of LX-ray photons emitted by 241Am, 238Pu, and 239Pu sources. A decay time constant of 180 ms for the detection signal pulses allowed the TES microcalorimeter to operate with a counting rate higher than 100 counts per second. The achieved energy resolution was 50 eV for the full width at half maximum of a peak corresponding to a 237Np Lβ1 X-ray of 17.75 keV.
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Development of TES microcalorimeter for high precision spectroscopy of LX-ray photons emitted from Transuranium Elements
Journal of Nuclear Science and Technology, 2008Co-Authors: Katsunori Ueno, Takahiro Umeno, Keisuke Nakamura, Keiichi Tanaka, Keisuke Maehata, Akihiro Yamaguchi, Kenji Ishibashi, Koji TakasakiAbstract:A microcalorimeter with the superconducting transition edge sensor (TES) with a Au absorber of 5.0 μm thick was fabricated for the energy dispersive measurement of LX-ray photons emitted from Transuranium Elements. The TES microcalorimeter and a superconducting quantum interference device (SQUID) amplifier chips were cooled by operating a compact 3He-4He dilution refrigerator without consuming liquid helium by loading a Gifford-McMahon (GM) cooler. Since the cold stages of the GM cooler are tightly coupled to the heat exchangers of the dilution refrigerator, the TES and SQUID chips suffered from mechanical vibrations induced by a reciprocating motion of the displacer of the GM cooler. Detection signals of LX-ray photons emitted from an 241Am source were observed by operating the TES microcalorimeter in severe noise environment induced by mechanical vibrations.
Keiichi Tanaka - One of the best experts on this subject based on the ideXlab platform.
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Development of a microcalorimeter with transition edge sensor for detection of LX rays emitted by Transuranium Elements
Radiation Protection Dosimetry, 2011Co-Authors: Keisuke Nakamura, KUNIAKI ISHIBASHI, Takahiro Umeno, Kimihiko Maehata, Takashi Yasumune, Koji Takasaki, Makoto Maeda, Keiichi Tanaka, Takumaro MomoseAbstract:A transition edge sensor (TES) microcalorimeter has been developed for use as an energy dispersive X-ray spectrometer. The TES microcalorimeter is a thermal detector that enables one to determine the energy of an incident photon by measuring the resultant increase in temperature. In this work, a Ti/Au TES microcalorimeter was developed to measure LX rays emitted by Transuranium Elements. The phase transition temperature was set at ∼200 mK by using a bilayer structure composed of a 110-nm-thick Au layer and a 40-nm-thick Ti layer. An Au of 5 µm thickness was deposited on the Ti/Au bilayer to achieve an absorption efficiency of 35-80 % for the energy range of LX rays (10-25 keV). The developed TES microcalorimeter was irradiated with LX rays emitted by an (241)Am source at an operating temperature of 140 mK. An energy resolution of ∼80 eV (full width at the half maximum) was obtained for L(β1)X ray of 17.75 keV.
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development of a tes microcalorimeter for spectroscopic measurement of lx rays emitted by Transuranium Elements
Journal of Nuclear Science and Technology, 2010Co-Authors: Keisuke Maehata, Takashi Yasumune, Koji Takasaki, Keisuke Nakamura, Keiichi Tanaka, Kenji Ishibashi, Akikazu Odawara, Atsushi NagataAbstract:A phase transition edge sensor (TES) microcalorimeter was developed for the energy-dispersive measurement of LX-ray photons emitted by Transuranium Elements. The phase transition temperature of the TES was designed to be 200mK using a bilayer structure of Au of 120 nm thickness and Ti of 50 nm thickness. A Au layer of 5.0 mm thickness was deposited on the Au/Ti bilayer to achieve an absorption efficiency of 50% and counting rate of 100 counts per second in the detection of LX-ray photons with energy from 10 to 20 keV. The TES microcalorimeter was operated for the detection of LX-ray photons emitted by 241Am, 238Pu, and 239Pu sources. A decay time constant of 180 ms for the detection signal pulses allowed the TES microcalorimeter to operate with a counting rate higher than 100 counts per second. The achieved energy resolution was 50 eV for the full width at half maximum of a peak corresponding to a 237Np Lβ1 X-ray of 17.75 keV.
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Development of TES microcalorimeter for high precision spectroscopy of LX-ray photons emitted from Transuranium Elements
Journal of Nuclear Science and Technology, 2008Co-Authors: Katsunori Ueno, Takahiro Umeno, Keisuke Nakamura, Keiichi Tanaka, Keisuke Maehata, Akihiro Yamaguchi, Kenji Ishibashi, Koji TakasakiAbstract:A microcalorimeter with the superconducting transition edge sensor (TES) with a Au absorber of 5.0 μm thick was fabricated for the energy dispersive measurement of LX-ray photons emitted from Transuranium Elements. The TES microcalorimeter and a superconducting quantum interference device (SQUID) amplifier chips were cooled by operating a compact 3He-4He dilution refrigerator without consuming liquid helium by loading a Gifford-McMahon (GM) cooler. Since the cold stages of the GM cooler are tightly coupled to the heat exchangers of the dilution refrigerator, the TES and SQUID chips suffered from mechanical vibrations induced by a reciprocating motion of the displacer of the GM cooler. Detection signals of LX-ray photons emitted from an 241Am source were observed by operating the TES microcalorimeter in severe noise environment induced by mechanical vibrations.
Atsushi Nagata - One of the best experts on this subject based on the ideXlab platform.
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development of a tes microcalorimeter for spectroscopic measurement of lx rays emitted by Transuranium Elements
Journal of Nuclear Science and Technology, 2010Co-Authors: Keisuke Maehata, Takashi Yasumune, Koji Takasaki, Keisuke Nakamura, Keiichi Tanaka, Kenji Ishibashi, Akikazu Odawara, Atsushi NagataAbstract:A phase transition edge sensor (TES) microcalorimeter was developed for the energy-dispersive measurement of LX-ray photons emitted by Transuranium Elements. The phase transition temperature of the TES was designed to be 200mK using a bilayer structure of Au of 120 nm thickness and Ti of 50 nm thickness. A Au layer of 5.0 mm thickness was deposited on the Au/Ti bilayer to achieve an absorption efficiency of 50% and counting rate of 100 counts per second in the detection of LX-ray photons with energy from 10 to 20 keV. The TES microcalorimeter was operated for the detection of LX-ray photons emitted by 241Am, 238Pu, and 239Pu sources. A decay time constant of 180 ms for the detection signal pulses allowed the TES microcalorimeter to operate with a counting rate higher than 100 counts per second. The achieved energy resolution was 50 eV for the full width at half maximum of a peak corresponding to a 237Np Lβ1 X-ray of 17.75 keV.
