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lithium deposition and ion implantationIshiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*
Materials Transactions, 54(9), p.1760 - 1764, 2013/09
Times Cited Count：4 Percentile：27.35(Materials Science, Multidisciplinary)Li
N synthesis on Li deposition layer was conducted without H
O and O by lithium deposition in high vacuum chamber of 10
Pa and ion implantation techniques and the thermo-chemical stability of the LiN/Li/Cu tri-layered target under laser heating and air exposure was characterized by X-ray photoelectron spectroscopy. Following conclusions were derived; (1) LiN/Li/Cu tri- layered target with very low oxide and carbon contamination was synthesized by lithium deposition and ion implantation techniques without HO and O additions and frequent synthesis of the target is possible. (2) The evaporating temperature of Li deposited layer increased by 120 K after forming the LiN layer on the surface of Li. (3) Remarkable oxidation and carbon contamination were observed on the surfaces of Li/Cu and LiN/Li/Cu after air exposure and these contaminated compositions formed on the surface of LiN/Li/Cu was not removed by Ar heavy sputtering.
Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*
Nuclear Instruments and Methods in Physics Research B, 288, p.18 - 22, 2012/10
Times Cited Count：12 Percentile：66.47(Instruments & Instrumentation)For the purpose of avoiding the radiation blistering of the lithium target for neutron production in BNCT (Boron Neutron Capture Therapy) device, trilaminar Li target, of which palladium thin layer was inserted between cupper substrate and Li layer, was newly designed. In-situ vacuum deposition and electrolytic coating techniques were applied to validate the method of fabrication of the Li/Pd/Cu target, and the layered structures of the synthesized target were characterized. In-situ vacuum re-deposition technique was also established for repairing and maintenance for lithium target damaged. Following conclusions were derived; (1) Uniform lithium layers with the thickness from 1.6 nm to a few hundreds nanometer were formed on Pd/Cu multilayer surface by in situ vacuum deposition technique using metallic lithium as a source material. (2) Re-deposition of lithium layer on Li surface can be achieved by in situ vacuum deposition technique.
Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*
no journal, ,
To achieve high performance of BNCT (Boron Neutron Capture Therapy) device, LiN/Li/Pd/Cu four layered Li target was designed and the structures of the synthesized four layered target were characterized by X-ray photoelectron spectroscopy. For the purpose of avoiding the radiation blistering and lithium evaporation, vacuum deposition and nitridation techniques were established for production and repairing maintenance of the lithium target. Following conclusions were derived;(1) Uniform lithium layer of a few hundreds nanometer was formed on Pd/Cu multilayer surface by vacuum deposition technique using metallic lithium as a source materialand lithium nitrides were formed by nitridation reaction by the implantation of low-energy nitrogen ions on the deposited lithium layer surface. (2) This nitridated zone formed on surface of four layered lithium target is stable for a long time in air condition.
Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*
no journal, ,
To achieve high performance of BNCT (Boron Neutron Capture Therapy) device, LiN/Li/Pd/Cu four layered Li target was designed and t synthesized by lithium deposition and ion implantation technique without HO and O. The composition and structure of lithium-nitride composite synthesized on the surface of lithium layer for the purpose of avoiding the radiation blistering and lithium evaporation during neutron production
Ishiyama, Shintaro; Imahori, Yoshio*
no journal, ,
To achieve high quality of life after cancer therapy by boron neutron capture and stem cell regeneration therapy, In-situ vacuum deposition test of lithium target on cooling platform for BNCT and cell model sorting test by intelligence robot were performed and these results provided evidence of effectiveness of these techniques.
Ishiyama, Shintaro; Imahori, Yoshio*
no journal, ,
For the purpose of avoiding the radiation blistering of the lithium target for neutron production in BNCT (Boron Neutron Capture Therapy) device, trilaminar Li target, of which palladium thin layer was inserted between cupper substrate and Li layer, was newly designed. The Li/Pd/Cu trilaminar structures of the synthesized target were characterized under 3 keV H
irradiation by XPS and XAFS technique, which provides structural/electronic properties of solids, and information about the local structure, such as the nature and number of surrounding atoms and inter-atomic distances. Following conclusions were derived; (1) Pd-Cu physical bonding was produced between the Pd and Cu interface by electro-less plating Pd deposition on a high purity Cu plate (2) From the XAFS observation of white line of Pd, the Pd L3 Edge jump was found after H irradiation, this fact indicates increase of hole density in Pd 4d-band.
Ishiyama, Shintaro
no journal, ,
In situ vacuum vaporization and N
ionplanting techniques were applied to improve thermostability of Li target in BNCT, and achieved improvement in high temperature thermaostabolity.
