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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

To achieve high performance of BNCT (Boron Neutron Capture Therapy) device, Li3N/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, in situ vacuum deposition and nitridation techniques were established for in situ production and repairing maintenance of the lithium target. Following conclusions were derived:Uniform lithium layer of a few hundreds nanometer was formed on Pd/Cu multilayer surface by in situ vacuum deposition technique using metallic lithium as a source material.Lithium nitrides were formed by in situ nitridation reaction by the implantation of low-energy nitrogen ions on the deposited lithium layer surface. The chemical states of the nitridated zone were close to the stoichiometric lithium nitride, Li3N.This nitridated zone formed on surface of four layered lithium target is stable for a long time in air condition. The in situ nitridation is effective to protect lithium target from degradation by unfavorable reactions. © 2012 Elsevier B.V. All rights reserved.


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.


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

To testify thermal stability of the BNCT neutron target synthesized by in-situ lithium deposition and ion implantation, laser heating test of the Li3N/Li/Cu tri-layered target was conducted in high vacuum chamber of 10-6 Pa and thermal stability of the tri-layered target was characterized by X-ray photoelectron spectroscopy. The following conclusions were derived; (1) The Li3N/Li/Cu tri-layered target with very low oxide and carbon contamination was synthesized by in-situ lithium deposition and ion implantation techniques without H2O and O2 additions. (2) The starting temperature of evaporation of the Li3N/Li/Cu tri-layered target increased by 120K compared to that of the Li/Cu target and (3) frequent repair synthesis of the damaged Li3N/Li/Cu tri-layered target caused by evaporation is possible. © 2013 The Japan Institute of Light Metals.


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

To prevent vaporization damage of BNCT (Boron Neutron Capture Therapy) lithium target during operation, direct synthesis of Li3N thin layer on lithium target surface was demonstrated in 0.1 MPa N2 gas at temperature below 548K and the following conclusions were derived; (1) Synthesis of Li3N thin layer on lithium surface was confirmed after nitridation at 276548K with surface contamination by oxygen and carbon. (2) Rapid nitridation over 15 mass%/min was observed above Li melting temperature, whereas slow reaction under 0.020.5 mass%/min below melting temperature. (3) During nitridation, removal of oxygen contamination on Li3N thin layer is taken place by nitrogen below Li melting temperature. © 2013 The Japan Institute of Light Metals.


Patent
Nippon Light Metal Co., Cancer Intelligence Care Systems Inc. and Sinter Land Incorporation Ltd. | Date: 2016-11-30

There are provided a method for manufacturing a magnesium fluoride sintered compact to be free from cracks and chipping and to have high relative density, a method for manufacturing a neutron moderator, and the neutron moderator. The method for manufacturing a magnesium fluoride sintered compact includes a powder filling process S1 for filling a magnesium fluoride powder material into a die by tapping, and an intermediate body sintering (pulsed electric current sintering) process S2 for performing pulsed electric current sintering for sintering the filled magnesium fluoride powder material while applying a pulsed electric current thereto, to obtain a magnesium fluoride sintered compact (intermediate body).


Patent
Tanaka Kikinzoku Kogyo K.K. and Cancer Intelligence Care Systems Inc. | Date: 2014-11-10

The present invention is a target for neutron generation, including a substrate coated with a palladium layer and a lithium layer such that a surface of the lithium layer is irradiated with charged particles to generate neutrons, and further including, between the palladium layer and the lithium layer, a barrier layer made of a metal that does not form a eutectic alloy with either palladium or lithium. As constituent metals for the barrier layer, specifically, copper, iron, nickel, cobalt, titanium, and zirconium are preferable. The target for neutron generation of the present invention does not degrade in performance even through long-term operation, and can also prevent lithium layer separation.


Patent
Nippon Light Metal Company, Cancer Intelligence Care Systems Inc. and SINTER LAND Incorporation Ltd. | Date: 2016-07-21

There are provided a method for manufacturing a magnesium fluoride sintered compact to be free from cracks and chipping and to have high relative density, a method for manufacturing a neutron moderator, and the neutron moderator. The method for manufacturing a magnesium fluoride sintered compact includes a powder filling process for filling a magnesium fluoride powder material into a die by tapping, and an intermediate body sintering (pulsed electric current sintering) process for performing pulsed electric current sintering for sintering the filled magnesium fluoride powder material while applying a pulsed electric current thereto, to obtain a magnesium fluoride sintered compact (intermediate body).


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 (106) is allowed to automatically regenerate lithium of a lithium target. The automatic lithium target regenerating apparatus (106) includes a lithium vapor deposition unit (1) for vapor-depositing the lithium on the lithium target. The lithium vapor deposition unit (1) is allowed to vapor-deposit the lithium on the lithium target by moving to the lithium target side.


Patent
Cancer Intelligence Care Systems Inc. | Date: 2014-04-30

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 (106) is allowed to automatically regenerate lithium of a lithium target. The automatic lithium target regenerating apparatus (106) includes a lithium vapor deposition unit (1) for vapor-depositing the lithium on the lithium target. The lithium vapor deposition unit (1) is allowed to vapor-deposit the lithium on the lithium target by moving to the lithium target side.


Patent
Tanaka Kikinzoku Kogyo K.K. and Cancer Intelligence Care Systems Inc. | Date: 2016-09-21

The present invention is a target for neutron generation, including a substrate coated with a palladium layer and a lithium layer such that a surface of the lithium layer is irradiated with charged particles to generate neutrons, and further including, between the palladium layer and the lithium layer, a barrier layer made of a metal that does not form a eutectic alloy with either palladium or lithium. As constituent metals for the barrier layer, specifically, copper, iron, nickel, cobalt, titanium, and zirconium are preferable. The target for neutron generation of the present invention does not degrade in performance even through long-term operation, and can also prevent lithium layer separation.

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