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Papers by Kenji Ishibashi
Journal of Low Temperature Physics, 2016
Journal of Nuclear Science and Technology, 2008
ABSTRACT
IEICE Transactions on Electronics, 2015
ABSTRACT A four-pixel-array superconducting transition-edge sensor (TES) microcalorimeter with a ... more ABSTRACT A four-pixel-array superconducting transition-edge sensor (TES) microcalorimeter with a mushroom-shaped absorber was fabricated for the energy dispersive spectroscopy performed on a transmission electron microscope. The TES consists of a bilayer of Au/Ti with either a 50-nm or 120-nm thickness. The absorber of 5.0 μm thick is made from a Au layer and its stem is deposited in the center of the TES surface. A Ta2O5 insulating layer of 100-nm thickness is inserted between the overhang region of the absorber and the TES surface. A selected pixel of the TES microcalorimeter was operated for the detection of Np L X-rays emitted from an 241Am source. A response of the TES microcalorimeter to L X-rays was obtained by analyzing detection signal pulses with using the optimal filter method. An energy resolution was obtained to be 33 eV of the full width at half maximum value at 17.751 keV of Np Lβ 1 considering its natural width of 13.4 eV. Response to L X-rays emitted from a mixture source of 238Pu, 239Pu and 241Am was obtained by operating the selected pixel of the TES microcalorimeter. Major L X-ray peaks of progeny elements of α decay of Pu and Am isotopes were clearly identified in the obtained energy spectrum. The experimental results demonstrated the separation of 241Am and plutonium isotopes by L X-ray spectroscopy.
Http Dx Doi Org 10 1080 00223131 2008 10875906, Aug 27, 2014
ABSTRACT A microcalorimeter with the superconducting transition edge sensor (TES) with a Au absor... more ABSTRACT 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.
Cryogenics, May 1, 2010
A superconducting transition edge thermosensor (TES) microcalorimeter was irradiated with LX-ray ... more A superconducting transition edge thermosensor (TES) microcalorimeter was irradiated with LX-ray photons emitted by an 241Am source maintained at an operating temperature of 120 mK using a compact liquid-helium-free 3He- 4He dilution refrigerator directly coupled to a Gifford-McMahon (GM) cooler. The first and second stages of the GM cooler were directly coupled to the first and second pre-cool heat exchangers of a stick shaped dilution unit through copper plates in a vacuum chamber. The helium-free dilution refrigerator provided a cooling power of 20 μW at 100 mK. Detection signals of LX-ray photons emitted by the 241Am source were observed by operating the TES microcalorimeter in a severe noise environment induced by the mechanical vibrations of the GM cooler.
Fusion Science and Technology, Oct 1, 2011
Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440), 2003
... Kota Torikai, Yoshio Arakida, Shigemi Inagaki, Kunio Koseki, Eiji Nakamura, Takeshi Toyama, M... more ... Kota Torikai, Yoshio Arakida, Shigemi Inagaki, Kunio Koseki, Eiji Nakamura, Takeshi Toyama, Masayoshi Wake, Junichi Kishiro, Ken Takayama, KEK, Ohol-1, Tsukuba City, Ibaraki, Japan, Kenji Ishibashi, Kyushu University, Hakozaki 6-10-1, Fukuoka, Japan ...
Journal of Nuclear Science and Technology, 2004
Geriatrics & gerontology international, 2010
The Positron Medical Center has developed a large number of radiopharmaceuticals and 36 radiophar... more The Positron Medical Center has developed a large number of radiopharmaceuticals and 36 radiopharmaceuticals have been approved for clinical use for studying aging and geriatric diseases, especially brain functions. Positron emission tomography (PET) has been used to provide a highly advanced PET-based diagnosis. The current status of the development of radiopharmaceuticals, and representative clinical and methodological results are reviewed.
PloS one, Jan 28, 2011
Adenosine A(2A) receptors (A2ARs) are thought to interact negatively with the dopamine D(2) recep... more Adenosine A(2A) receptors (A2ARs) are thought to interact negatively with the dopamine D(2) receptor (D2R), so selective A2AR antagonists have attracted attention as novel treatments for Parkinson's disease (PD). However, no information about the receptor in living patients with PD is available. The purpose of this study was to investigate the relationship between A2ARs and the dopaminergic system in the striata of drug-naïve PD patients and PD patients with dyskinesia, and alteration of these receptors after antiparkinsonian therapy. We measured binding ability of striatal A2ARs using positron emission tomography (PET) with [7-methyl-(11)C]-(E)-8-(3,4,5-trimethoxystyryl)-1,3,7-trimethylxanthine ([(11)C]TMSX) in nine drug-naïve patients with PD, seven PD patients with mild dyskinesia and six elderly control subjects using PET. The patients and eight normal control subjects were also examined for binding ability of dopamine transporters and D2Rs. Seven of the drug-naïve patients ...
A microcalorimeter chip was fabricated by using 0.99SrTiO3–0.01SrTa2O6 dielectric material. After... more A microcalorimeter chip was fabricated by using 0.99SrTiO3–0.01SrTa2O6 dielectric material. After cooling down below 100mK, the dielectric microcalorimeter was irradiated by α particles emitted from an 241Am source. The operating temperature of the dielectric microcalorimeter was maintained by operating a liquid helium-free compact dilution refrigerator. The dielectric microcalorimeter was irradiated by 5.5MeVα particles emitted from an 241Am source at the
ABSTRACT We have demonstrated the applications of surfactant added TMAH for the formation of new ... more ABSTRACT We have demonstrated the applications of surfactant added TMAH for the formation of new shapes of MEMS components. The research is further extended for in-situ observation of the Si/(TMAH+surfactant) interface during the etching process using Fourier transform infrared microscopy (FT-IR) in the multiple internal reflection (MIR) geometry to detect the selective adsorption of the surfactant on different crystallographic planes. The study is primarily aimed at investigating the causes behind the change in the etching behavior of TMAH solution when the surfactant is added. Silicon wafers with different orientation are used to observe the selective adsorption of the surfactant on their surfaces.
Journal of Nuclear Science and Technology, 2014
ABSTRACT The L X-ray photons emitted by transuranic (TRU) elements are expected to be useful for ... more ABSTRACT The L X-ray photons emitted by transuranic (TRU) elements are expected to be useful for developing nondestructive TRU monitors. Energy spectra of L X-rays emitted by 241Am, 238Pu and 239Pu sources were measured by a transition edge sensor (TES) microcalorimeter, which allowed precise peak identification with high energy resolution. In the measurements using the TES microcalorimeter, the full width at half-maximum energy resolution was 62.6 eV at 17.222 keV for 239Pu source, 62.5 eV at 17.222 keV for 238Pu source and 60.9 eV at 17.751 keV for 241Am source. This study demonstrates the separation of 241Am and plutonium isotopes by L X-ray spectroscopy using a TES microcalorimeter.
TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan), 1995
The neutron-production double-dieren tial cross sections for the neutron-induced reaction were me... more The neutron-production double-dieren tial cross sections for the neutron-induced reaction were measured on Fe at 140 { 160 MeV. Neutrons produced by a 800 MeV proton-bombarded spallation target were used as incident particles. The results are compared with calclated data.
Review of Scientific Instruments, 1986
ABSTRACT
Review of Scientific Instruments, 2003
A survey of biophysical and biomedical applications of free-electron lasers (FELs) is presented. ... more A survey of biophysical and biomedical applications of free-electron lasers (FELs) is presented. ... Infrared FELs have been used as sources for inverse Compton scattering to produce a pulsed ...FEL research and FEL applications research have allowed the specification of spin-off ...
Journal of Low Temperature Physics, 2016
Journal of Nuclear Science and Technology, 2008
ABSTRACT
IEICE Transactions on Electronics, 2015
ABSTRACT A four-pixel-array superconducting transition-edge sensor (TES) microcalorimeter with a ... more ABSTRACT A four-pixel-array superconducting transition-edge sensor (TES) microcalorimeter with a mushroom-shaped absorber was fabricated for the energy dispersive spectroscopy performed on a transmission electron microscope. The TES consists of a bilayer of Au/Ti with either a 50-nm or 120-nm thickness. The absorber of 5.0 μm thick is made from a Au layer and its stem is deposited in the center of the TES surface. A Ta2O5 insulating layer of 100-nm thickness is inserted between the overhang region of the absorber and the TES surface. A selected pixel of the TES microcalorimeter was operated for the detection of Np L X-rays emitted from an 241Am source. A response of the TES microcalorimeter to L X-rays was obtained by analyzing detection signal pulses with using the optimal filter method. An energy resolution was obtained to be 33 eV of the full width at half maximum value at 17.751 keV of Np Lβ 1 considering its natural width of 13.4 eV. Response to L X-rays emitted from a mixture source of 238Pu, 239Pu and 241Am was obtained by operating the selected pixel of the TES microcalorimeter. Major L X-ray peaks of progeny elements of α decay of Pu and Am isotopes were clearly identified in the obtained energy spectrum. The experimental results demonstrated the separation of 241Am and plutonium isotopes by L X-ray spectroscopy.
Http Dx Doi Org 10 1080 00223131 2008 10875906, Aug 27, 2014
ABSTRACT A microcalorimeter with the superconducting transition edge sensor (TES) with a Au absor... more ABSTRACT 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.
Cryogenics, May 1, 2010
A superconducting transition edge thermosensor (TES) microcalorimeter was irradiated with LX-ray ... more A superconducting transition edge thermosensor (TES) microcalorimeter was irradiated with LX-ray photons emitted by an 241Am source maintained at an operating temperature of 120 mK using a compact liquid-helium-free 3He- 4He dilution refrigerator directly coupled to a Gifford-McMahon (GM) cooler. The first and second stages of the GM cooler were directly coupled to the first and second pre-cool heat exchangers of a stick shaped dilution unit through copper plates in a vacuum chamber. The helium-free dilution refrigerator provided a cooling power of 20 μW at 100 mK. Detection signals of LX-ray photons emitted by the 241Am source were observed by operating the TES microcalorimeter in a severe noise environment induced by the mechanical vibrations of the GM cooler.
Fusion Science and Technology, Oct 1, 2011
Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440), 2003
... Kota Torikai, Yoshio Arakida, Shigemi Inagaki, Kunio Koseki, Eiji Nakamura, Takeshi Toyama, M... more ... Kota Torikai, Yoshio Arakida, Shigemi Inagaki, Kunio Koseki, Eiji Nakamura, Takeshi Toyama, Masayoshi Wake, Junichi Kishiro, Ken Takayama, KEK, Ohol-1, Tsukuba City, Ibaraki, Japan, Kenji Ishibashi, Kyushu University, Hakozaki 6-10-1, Fukuoka, Japan ...
Journal of Nuclear Science and Technology, 2004
Geriatrics & gerontology international, 2010
The Positron Medical Center has developed a large number of radiopharmaceuticals and 36 radiophar... more The Positron Medical Center has developed a large number of radiopharmaceuticals and 36 radiopharmaceuticals have been approved for clinical use for studying aging and geriatric diseases, especially brain functions. Positron emission tomography (PET) has been used to provide a highly advanced PET-based diagnosis. The current status of the development of radiopharmaceuticals, and representative clinical and methodological results are reviewed.
PloS one, Jan 28, 2011
Adenosine A(2A) receptors (A2ARs) are thought to interact negatively with the dopamine D(2) recep... more Adenosine A(2A) receptors (A2ARs) are thought to interact negatively with the dopamine D(2) receptor (D2R), so selective A2AR antagonists have attracted attention as novel treatments for Parkinson's disease (PD). However, no information about the receptor in living patients with PD is available. The purpose of this study was to investigate the relationship between A2ARs and the dopaminergic system in the striata of drug-naïve PD patients and PD patients with dyskinesia, and alteration of these receptors after antiparkinsonian therapy. We measured binding ability of striatal A2ARs using positron emission tomography (PET) with [7-methyl-(11)C]-(E)-8-(3,4,5-trimethoxystyryl)-1,3,7-trimethylxanthine ([(11)C]TMSX) in nine drug-naïve patients with PD, seven PD patients with mild dyskinesia and six elderly control subjects using PET. The patients and eight normal control subjects were also examined for binding ability of dopamine transporters and D2Rs. Seven of the drug-naïve patients ...
A microcalorimeter chip was fabricated by using 0.99SrTiO3–0.01SrTa2O6 dielectric material. After... more A microcalorimeter chip was fabricated by using 0.99SrTiO3–0.01SrTa2O6 dielectric material. After cooling down below 100mK, the dielectric microcalorimeter was irradiated by α particles emitted from an 241Am source. The operating temperature of the dielectric microcalorimeter was maintained by operating a liquid helium-free compact dilution refrigerator. The dielectric microcalorimeter was irradiated by 5.5MeVα particles emitted from an 241Am source at the
ABSTRACT We have demonstrated the applications of surfactant added TMAH for the formation of new ... more ABSTRACT We have demonstrated the applications of surfactant added TMAH for the formation of new shapes of MEMS components. The research is further extended for in-situ observation of the Si/(TMAH+surfactant) interface during the etching process using Fourier transform infrared microscopy (FT-IR) in the multiple internal reflection (MIR) geometry to detect the selective adsorption of the surfactant on different crystallographic planes. The study is primarily aimed at investigating the causes behind the change in the etching behavior of TMAH solution when the surfactant is added. Silicon wafers with different orientation are used to observe the selective adsorption of the surfactant on their surfaces.
Journal of Nuclear Science and Technology, 2014
ABSTRACT The L X-ray photons emitted by transuranic (TRU) elements are expected to be useful for ... more ABSTRACT The L X-ray photons emitted by transuranic (TRU) elements are expected to be useful for developing nondestructive TRU monitors. Energy spectra of L X-rays emitted by 241Am, 238Pu and 239Pu sources were measured by a transition edge sensor (TES) microcalorimeter, which allowed precise peak identification with high energy resolution. In the measurements using the TES microcalorimeter, the full width at half-maximum energy resolution was 62.6 eV at 17.222 keV for 239Pu source, 62.5 eV at 17.222 keV for 238Pu source and 60.9 eV at 17.751 keV for 241Am source. This study demonstrates the separation of 241Am and plutonium isotopes by L X-ray spectroscopy using a TES microcalorimeter.
TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan), 1995
The neutron-production double-dieren tial cross sections for the neutron-induced reaction were me... more The neutron-production double-dieren tial cross sections for the neutron-induced reaction were measured on Fe at 140 { 160 MeV. Neutrons produced by a 800 MeV proton-bombarded spallation target were used as incident particles. The results are compared with calclated data.
Review of Scientific Instruments, 1986
ABSTRACT
Review of Scientific Instruments, 2003
A survey of biophysical and biomedical applications of free-electron lasers (FELs) is presented. ... more A survey of biophysical and biomedical applications of free-electron lasers (FELs) is presented. ... Infrared FELs have been used as sources for inverse Compton scattering to produce a pulsed ...FEL research and FEL applications research have allowed the specification of spin-off ...