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Patent
Cancer Intelligence Care Systems Inc. | Date: 2012-05-31

Provided are an automatic lithium target regenerating apparatus and an automatic lithium target regenerating method, which are equipped with a measurement function of a lithium film thickness of a lithium target, and may automatically regenerate the consumed lithium target by moving a vapor deposition source to the lithium target. An automatic lithium target regenerating apparatus (


Ishiyama S.,Japan Atomic Energy Agency | Fujii R.,Cancer Intelligence Care Systems Inc. | Nakamura M.,Cancer Intelligence Care Systems Inc. | Imahori Y.,Cancer Intelligence Care Systems Inc.
Materials Transactions | Year: 2014

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 H2 + 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. The following conclusions were derived; PdCu physical bonding was produced between the Pd and Cu interface by electro-less plating Pd deposition on a high purity Cu plate. From the XAFS observation of white line of Pd, the Pd L3 edge jump was found after H2 + irradiation, this fact indicates increase of hole density in Pd 4d-band. 0.9 eV chemical shift was also observed in Pd L3 white line for monolayer and 1 ?m Pd/Cu samples, which will affect the quality of the Li/Pd/Cu target due to the formation of PdHx in palladium insert layer. © 2014 The Japan Institute of Metals and Materials. Source


Ishiyama S.,Japan Atomic Energy Agency | Baba Y.,Japan Atomic Energy Agency | Fujii R.,Cancer Intelligence Care Systems Inc. | Nakamura M.,Cancer Intelligence Care Systems Inc. | Imahori Y.,Cancer Intelligence Care Systems Inc.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2012

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. (3) Small amount of water and carbonate was observed on the top surface of Li. But the thickness of the adsorbed layer was less than monolayer, which will not affect the quality of the Li target. (4) The formation of Pd-Li alloy layer was observed at the Pd and Li interface. The alloy layer would contribute to the stability of the Li layer. © 2012 Elsevier B.V. All rights reserved. Source


Ishiyama S.,Japan Atomic Energy Agency | Baba Y.,Japan Atomic Energy Agency | Fujii R.,Cancer Intelligence Care Systems Inc. | Nakamura M.,Cancer Intelligence Care Systems Inc. | Imahori Y.,Cancer Intelligence Care Systems Inc.
Materials Transactions | Year: 2014

To remove high level of contaminants by O and C from Li3N surface for Boron Neutron Capture Therapy target, high temperature thermal desorption was conducted up to 1123K in ultra high vacuum and the following results were derived; During thermal desorption up to 1023 K, typical three peaks of vacuum pressure disturbance due to vaporization of contaminants were observed in vacuum pressure-temperature curve. Over-layered contaminants with high melting temperature below 1023K on Li3N surface is completely removed by high temperature thermal desorption up to 1123K in ultra high vacuum. From these desorption results, it is suggested that these contaminants corresponding to these vaporization peaks are H2O and Li compounds with high melting temperature below 1023 K, of which LiOH and Li2CO3 were synthesized by decomposition process of Li3N with residual H2O and CO2 in low temperature. © 2013 The Japan Institute of Metals and Materials. Source


Ishiyama S.,Japan Atomic Energy Agency | Baba Y.,Japan Atomic Energy Agency | Fujii R.,Cancer Intelligence Care Systems Inc. | Nakamura M.,Cancer Intelligence Care Systems Inc. | Imahori Y.,Cancer Intelligence Care Systems Inc.
Materials Transactions | Year: 2013

Low temperature synthesis of lithium-nitride compound was conducted on the lithium target for BNCT by N2/H2O mixing gas squirt in the ultra high vacuum chamber and the following results were derived. (1) Lithium-nitride compound was synthesized on the lithium target under 101.3 Pa N2 gas squirt at room temperature and in the ultra high vacuum chamber under the pressure of 1 x 10-8Pa. (2) Remarkable contamination by O and C was observed on the lithium-nitride compound synthesized under the squirt pressure of 13.3-80 Pa/1.33-4.7 Pa N 2/H2O mixing gas. (3) No contamination and synthesis of Li-N compound was observed under the squirt pressure of 0.013-0.027 Pa/0-0.005 Pa N2/H2O mixing gas. (4) Contamination by O and C was enhanced with excessive addition of H2O at the pressure of over 1.33 Pa. © 2013 The Japan Society for Technology of Plasticity. Source

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