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Journal Articles

THz beam transmission demonstration experiment using metallic cladding polymer fibers

Ishiyama, Shintaro; Masamune, Ken*; Idehara, Toshitaka*

Nihon Kikai Gakkai Rombunshu (Internet), 82(833), p.15-00449_1 - 15-00449_14, 2016/01

Transmission demonstration experiment of 0.1-0.2 THz beam was performed with transmission system consisted of polymer fibers of 3 mm $$times$$ 300 mmL coated with gold metal. THz beam was generated by high power compact gyrotron designed output power of 0.25 kW and measured output power at terminal of metallic cladding polymer fibers in the transmission system and the following results were derived. (1) It was demonstrated that maximum output power of the order of 0.84 W through the polymer fibers was observed by SBD detector at input power of the order of 7.5 W.

Journal Articles

Determination of the compound biological effectiveness (CBE) factors based on the ISHIYAMA-IMAHORI deterministic parsing model with the dynamic PET technique

Ishiyama, Shintaro; Imahori, Yoshio*; Itami, Jun*; Koivunoro, H.*

Global Journal of Medical Research; F, 15(4), p.1 - 5, 2015/11

In defining the biological effects of the neutron capture reaction, we have proposed a deterministic parsing model (ISHIYAMA-IMAHORI model) to determine the Compound Biological Effectiveness (CBE) factor in Borono-Phenyl-Alanine (BPA)-mediated Boron Neutron Capture Therapy (BNCT). To determine the CBE factor, we derived new calculation formula founded on the deterministic parsing model with three constants, CBE0, F, n and the eigen value Nth/Nmax. where, Nth and Nmax are the threshold value of boron concentration of N and saturation boron density. In order to determine Nth and Nmax in the formula, sigmoid logistic function was employed for $$^{10}$$B concentration data, Db(t) obtained by dynamic PETtechnique, where, A, a and t0 are constants. From the application of sigmoid function to dynamic PET data, it is concluded that the Nth and Nmax for tissue and tumor are identified with the parameter constants in the sigmoid function in tion as: th b at 0 and max N = D t = N = x.

Journal Articles

Determination of the Compound Biological Effectiveness (CBE) factors based on the ISHIYAMA-IMAHORI deterministic parsing model with the dynamic PET technique

Ishiyama, Shintaro; Imahori, Yoshio*; Itami, Jun*; Koivunoro, H.*

Journal of Cancer Therapy, 6(8), p.759 - 766, 2015/08

From the concentration of 10BPA drug was intravenously injected into the tumor and normal cells of brain tumor patients measured by dynamic PET method, the CBE factor for the BNCT treatment can be calculated by using ISHIYAMA-IMAHORI model.

Journal Articles

Structural refinement and dispersion of high level radioactive contaminated soil processing by chemical interface controlled and high-speed shearing washing technique

Ishiyama, Shintaro

Kagaku Kogaku Rombunshu, 41(2), p.95 - 99, 2015/02

 Times Cited Count:0 Percentile:0(Engineering, Chemical)

Chemical interface controlled dispersion and high-speed shearing water washing tests were implemented for the purpose of optimization of processing conditions with highly radioactive contaminated soils of over 570,000 Bq/kg in Fukushima and the following results were obtained. (1) Dispersion of the radioactive contaminated soil over 570,000 Bq/kg was enhanced in alkalized washing solution at babe equilibrium point of pH=10-11. (2) Refinement of contaminated soils was also promoted by collision of contaminated soil particles toward washing machine walls and inter-particle collision during soil washing process and remarkable washing performance was achieved under the combination of dispersion and high-speed shearing washing condition with 50% solid density in wash solution.

Journal Articles

Deterministic parsing model of the compound biological effectiveness (CBE) factor for intracellular $$^{10}$$boron distribution in boron neutron capture therapy

Ishiyama, Shintaro

Journal of Cancer Therapy, 5(14), p.1388 - 1398, 2014/12

Deterministic parsing model of Compound Biological Effectiveness (CBE) in BPA-mediated BNCT was proposed for intra-organ $$^{10}$$B distribution. In defining the biological effects of the $$^{10}$$B($$n$$,$$alpha$$)$$^{7}$$Li neutron capture reaction, CBE factor model is expressed; CBE = CBE$$_{0}$$ ($$r_{0}$$ $$<$$ $$r$$ or $$N$$ $$<$$ $$N_{rm th}$$) and CBE = CBE$$_{0}$$ + $$F$$[1-($$N$$/$$N_{rm th}$$)(-2/3)][1-($$N$$/$$N_{rm th}$$)(-1/3)] ($$r_{0}$$ $$>$$ $$r$$ or $$N$$$$>$$$$N_{rm th}$$) Where $$r$$ and $$r_{0}$$ are distance between boron atoms and $$alpha$$ range, $$N$$ and $$N_{rm th}$$ are boron concentration and threshold of $$^{10}$$B concentration in tissues and tumour, CBE$$_{0}$$ and $$F$$ are obtained as 0.5 and 8 for normal tissues and for tumour, respectively. $$N$$ and $$N_{rm th}$$ are evaluated the bio-distribution of $$^{10}$$B in normal tissues and tumour after injection and the CBE factor for normal tissues and tumor approximately within + 0.12 to -0.54% high accuracy.

Journal Articles

Genetic algorithm controlled Move on Sensing automatic manipulation for growing simulation of differentiated iPS cells

Ishiyama, Shintaro; Minami, Mamoru*

Journal of Bioinformatics and Biological Engineering (Internet), 2(1), p.63 - 74, 2014/11

New control scheme Move on Sensing (MOS) technology was proposed and demonstrated its great potential as autonomous control system to be able to respond to interaction with growing simulation environment of differentiated iPS cells and the following results are derived; (1) Remove of the targeted cell models is completed by 20 times selection process from original cell group model composed of 20 red and 20 blue colored beads within 16 sec per cell. (2) High-accuracy sorting operation of iPS cell model was achieved within 16 sec per cell. (3) Retrievability of the discrete cell models isolated from group model is ensured by use of the MOS control.

Journal Articles

Performance evaluation of water circulating system in soil washing system for highly concentrated radiation-contaminated soil

Ishiyama, Shintaro

Kagaku Kogaku Rombunshu, 40(6), p.462 - 465, 2014/11

 Times Cited Count:0 Percentile:0(Engineering, Chemical)

For the purpose of performance evaluation of new water circulating system (Amount of evaporation: 40 kg/h) in radiation contaminated soil washing process, decontamination water washing and water circulating tests for the system were conducted with over 570,000 Bq/kg radiation contamination soil in FUKUSHIMA and the following results were derived;(1) Interfusion of fission product due to dissociation from contaminated soil into filtrate was observed after filter press, and interfusion amount of FP for contaminated moor soil and village road soil reached to 35% and 0.01%, respectively. (2) Condensation water with very low contamination and impurity was produced by the water circulating machine and 86-88% recovery rate from filtrate was achieved. (3) Almost FP was concentrated in concentrated solution and concentration rate of solution reached to 7.2-8.6.

Journal Articles

Performance evaluation of a solidification process for highly concentrated radiation contaminated surplus soil

Ishiyama, Shintaro; Otani, Kazuhisa*; Yamashita, Manabu*

Kagaku Kogaku Rombunshu, 40(6), p.466 - 469, 2014/11

 Times Cited Count:0 Percentile:0(Engineering, Chemical)

For the purpose of performance evaluation of the field portable (360 mmD $$times$$ 360 mmH $$times$$ 800 mmW) and fixed mount type filter presses(1880 mmD $$times$$ 2140 mmH $$times$$ 9085 mmW) for soil consolidation in radiation contaminated soil washing process, decontamination water washing test and radiation assessment for these filter presses were conducted with over 570,000 Bq/kg radiation contamination soil in FUKUSHIMA and the following results were derived; (1) About 10% volume reduction was achieved in soil consolidation process by the field portable filter press with 1.3-6.7 times high condensation of radiation density. (2) During soil consolidation, core dose in the field portable and fixed mount type were evaluated as 2.5 and 196 $$mu$$Sv/h, respectively, and exposed dose in ordinary maintenance and inspection in excess of radiation protection guide level, especially for the fixed mount type in terms of radiation protection.

Journal Articles

$$L_{3}$$-edge jump and shift on white-line of Pd interlayer for trilaminar neutron production target under H$$_{2}$$$$^{+}$$ irradiation

Ishiyama, Shintaro; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Journal of Chemistry and Chemical Engineering, 8(9), p.870 - 875, 2014/09

Interlayer Pd for the Li/Pd/Cu neutron target for BNCT (Boron Neutron Capture Therapy) was characterized after 0.1-5 keV H$$_{2}$$$$^{+}$$ irradiation by XAFS technique, and following conclusions were derived; (1) From the XAFS observation of white line of Pd, remarkable Pd $$L_{3}$$ Edge jump was found in 1.1-3 times higher than before irradiation in low irradiation fluence. (2) This fact indicates increase of hole density in Pd 4d-band, whereas no change was observed for XASF spectra of Ag sample under the same irradiation conditions. (3) Remarkable Pd $$L_{3}$$ Edge shift of 0.12-0.66 eV was also found with increase of H$$_{2}$$$$^{+}$$ irradiation energy in low fluence, and drastically decreased after peak in high irradiation energy and fluence.(4)Implanted protons deposited in Pd as negative under the balance of electron population enhanced by proton irradiation and charge transfer.

Journal Articles

Low temperature and pressure synthesis of lithium-nitride compound with H$$_{2}$$O addition on lithium target for BNCT

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Nihon Kinzoku Gakkai-Shi, 78(8), p.317 - 321, 2014/08

 Times Cited Count:0 Percentile:0.01(Metallurgy & Metallurgical Engineering)

Low temperature synthesis of lithium-nitride compound was conducted on the lithium target for BNCT by N$$_{2}$$/H$$_{2}$$O 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 N$$_{2}$$ gas squirt at room temperature and in the ultra high vacuum chamber under the pressure of 1$$times$$10$$^{-8}$$ Pa. (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$$_{2}$$/H$$_{2}$$O 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 N$$_{2}$$/H$$_{2}$$O mixing gas. (4) Contamination by O and C was enhanced with excessive addition of H$$_{2}$$O at the pressure of over 1.33 Pa.

Journal Articles

Surficial chemical states of Li$$_{3}$$N synthesized on lithium target for boron neutron capture therapy

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Nihon Kinzoku Gakkai-Shi, 78(8), p.322 - 325, 2014/08

 Times Cited Count:0 Percentile:0.01(Metallurgy & Metallurgical Engineering)

To remove high level of contaminants by O and C from Li$$_{3}$$N surface for boron neutron capture therapy target, high temperature thermal desorption was conducted up to 1123 K in ultra high vacuum and the following results were derived; (1) 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. (2) Over-layered contaminants with high melting temperature below 1023 K on Li$$_{3}$$N surface is completely removed by high temperature thermal desorption up to 1123 K in ultra high vacuum. (3) From these desorption results, it is suggested that these contaminants corresponding to these vaporization peaks are H$$_{2}$$O and Li compounds with high melting temperature below 1023 K, of which LiOH and Li$$_{2}$$CO$$_{3}$$ were synthesized by decomposition process of Li$$_{3}$$N with residual H$$_{2}$$O and CO$$_{2}$$ in low temperature.

Journal Articles

Direct synthesis of Li$$_{3}$$N thin layer on lithium target surface for BNCT in N$$_{2}$$ gaseous conditions

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Nihon Kinzoku Gakkai-Shi, 78(4), p.137 - 141, 2014/04

 Times Cited Count:0 Percentile:0.01(Metallurgy & Metallurgical Engineering)

To prevent vaporization damage of BNCT (Boron Neutron Capture Therapy) lithium target during operation, direct synthesis of Li$$_{3}$$N thin layer on lithium target surface was demonstrated in 0.1 MPa N$$_{2}$$ gas at temperature below 548 K and the following conclusions were derived; (1) Synthesis of Li$$_{3}$$N thin layer on lithium surface was confirmed after nitridation at 276$$sim$$548 K with surface contamination by oxygen and carbon. (2) Rapid nitridation over 1-5wt.%/min was observed above Li melting temperature, whereas slow reaction under 0.02-0.5 wt.%/min below melting temperature. (3) During nitridation, removal of oxygen contamination on Li$$_{3}$$N thin layer is taken place by nitrogen below Li melting temperature.

Journal Articles

New micromachining technique for unworkable sapphire by highly coalesced ion implantation and eximer laser irradiation

Ishiyama, Shintaro; Oba, Hironori; Yamamoto, Shunya; Shobu, Takahisa

Kagaku Kogaku Rombunshu, 40(2), p.131 - 136, 2014/03

 Times Cited Count:0 Percentile:0(Engineering, Chemical)

New micromachining technique of unworkable sapphire was demonstrated by highly coalesced ion implantation and eximer laser irradiation methods. After proton implantation by 0.3 MeV H$$_{2}$$$$^{+}$$ up to 1$$times$$10$$^{17}$$/cm$$^{2}$$ into sapphire, damaged region was formed beneath 1$$mu$$m depth from the surface of implanted sapphire and blistering was observed by 0.3$$sim$$3 MeV H$$_{2}$$$$^{+}$$ over 1$$times$$10$$^{17}$$/cm$$^{2}$$. Ion implanted sapphire behaves peculiar wavelength absorption at 200 nm and ion implanted sapphire by 0.3 MeV H$$_{2}$$$$^{+}$$ up to 1$$times$$10$$^{17}$$/cm$$^{2}$$ was irradiated by ArF laser with 3.4 J/cm$$^{2}$$$$times$$1 shot and micro trench shape with 1$$mu$$m depth and 50$$sim$$80 $$mu$$m width was observed on the surface of ion implanted sapphire. These results mean that micromachining of sapphire on the order of $$mu$$m width with arbitrarily depth can be possible by highly coalesced ion implantation and laser irradiation techniques.

Journal Articles

3KeV H$$_{2}$$$$^{+}$$ irradiation to Li/Pd/Cu trilaminar neutron production target for BNCT

Ishiyama, Shintaro; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Materials Transactions, 55(4), p.658 - 663, 2014/03

 Times Cited Count:2 Percentile:14.05(Materials Science, Multidisciplinary)

The Li/Pd/Cu trilaminar structures of the synthesized target for BNCT were characterized under 3keV H$$_{2}$$$$^{+}$$ 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 $$L$$3 Edge jump was found after H$$_{2}$$$$^{+}$$ irradiation, this fact indicates increase of hole density in Pd 4$$d$$-band. (3) 0.9 eV chemical shift was also observed in Pd $$L$$3 white line for Pd/Cu samples, which will affect the quality of the Li/Pd/Cu target due to the formation of PdH$$_{x}$$ in palladium insert layer.

Journal Articles

Surficial chemical states of Li$$_{3}$$N synthesized on lithium target for boron neutron capture therapy

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Materials Transactions, 55(3), p.539 - 542, 2014/01

 Times Cited Count:2 Percentile:14.05(Materials Science, Multidisciplinary)

To remove high level of contaminants by O and C from Li$$_{3}$$N surface for BNCT target, high temperature thermal desorption was conducted up to 1123 K in ultra high vacuum and the following results were derived; (1) 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. (2) Over-layered contaminants with high melting temperature below 1023 K on Li$$_{3}$$N surface is completely removed by high temperature thermal desorption up to 1123 K in ultra high vacuum. (3) From these desorption results, it is suggested that these contaminants corresponding to these vaporization peaks are H$$_{2}$$O and Li compounds with high melting temperature below 1023 K, of which LiOH and Li$$_{2}$$CO$$_{3}$$ were synthesized by decomposition process of Li$$_{3}$$N with residual H$$_{2}$$O and CO$$_{2}$$ in low temperature.

Journal Articles

Low temperature and pressure synthesis of lithium-nitride compound with H$$_{2}$$O addition on lithium target for BNCT

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Materials Transactions, 54(12), p.2233 - 2237, 2013/12

 Times Cited Count:4 Percentile:29.98(Materials Science, Multidisciplinary)

Low temperature synthesis of lithium-nitride compound was conducted on the lithium target for BNCT by N$$_{2}$$/H$$_{2}$$O mixing gas squirt in ultra high vacuum chamber, and the following results were derived; (1) Lithium-nitride compound was synthesized on lithium target under 101.3 PaN$$_{2}$$ gas squirt at room temperature and 1$$times$$ 10$$^{-8}$$ Pa in ultra high vacuum chamber. (2) Remarkable contamination by O and C was observed on the lithium-nitride compound synthesized by 13.3 $$sim$$ 80 Pa/1.33 $$sim$$ 4.7 Pa N$$_{2}$$/H$$_{2}$$O mixing gas squirt. (3) No contamination and synthesis of Li-N compound was observed at 0.013 $$sim$$ 0.027 Pa/0 $$sim$$ 0.005 Pa N$$_{2}$$/H$$_{2}$$O squirt. (4) Contamination by O and C is enhanced with excessive addition of over 1.33 Pa H$$_{2}$$O addition.

Journal Articles

Reclamation of highly radioactive contaminated soil by a combination of chemical interface controlled dispersion and high-speed shearing washing

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*; Hiki, Akinori*

Kagaku Kogaku Rombunshu, 39(6), p.545 - 552, 2013/11

 Times Cited Count:3 Percentile:15.02(Engineering, Chemical)

Chemical interface controlled dispersion and high speed shearing (CDS) washing verification test of high level radioactive contaminated soil over 570,000 Bq/kg was conducted using three kinds of radioactive contaminated soils of school ground, moor and road in Fukushima and the following results was obtained. (1) Washing rate of three kinds of contaminated soils reached up to 60-98% after 60 minutes CDS water washing. (2) Recovered amounts of reclamation soils of three type of soils(less than 8,000 Bq/kg) were 60-82 wt.%. Especially, 506 Bq/kg $$times$$ 33wt.% was achieved in the case of contaminated soil of moor. (3) Volume reductions of 60-85wt.% were achieved in every case of contaminated soils. (4) Contain recoverable quantities of total radioactive sources contained in soils was over 90%. (5) Main FP trapping minerals contained in contaminated soil of school ground is lamellar silicate and that of moor and road is mordenite.

Journal Articles

Thermal stability of BNCT neutron production target synthesized by ${it in-situ}$ lithium deposition and ion implantation

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Nihon Kinzoku Gakkai-Shi, 77(11), p.509 - 513, 2013/11

 Times Cited Count:1 Percentile:11.4(Metallurgy & Metallurgical Engineering)

To testify thermal stability of the BNCT neutron target synthesized by ${it in-situ}$ lithium deposition and ion implantation, laser heating test of the Li$$_{3}$$N/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. Following conclusions were derived; (1) The Li$$_{3}$$N/Li/Cu tri- layered target with very low oxide and carbon contamination was synthesized by ${it in-situ}$ lithium deposition and ion implantation techniques without H$$_{2}$$O and O$$_{2}$$ additions (2) The starting temperature of evaporation of the Li$$_{3}$$N/Li/Cu tri-layered target increased by 120 K compared to that of the Li/Cu target and (3) frequent repair synthesis of the damaged Li$$_{3}$$N/Li/Cu tri-layered target caused by evaporation is possible.

Journal Articles

Volume reduction effect of radioactive contaminated soil by high temperature heating process

Ishiyama, Shintaro; Mamitani, Masataka*; Kondo, Mitsunori*; Hiki, Akinori*

Nihon Kikai Gakkai Rombunshu, A, 79(806), p.1504 - 1516, 2013/10

For the purpose of removal of $$^{137}$$Cs from highly densified contaminate soil produced after contaminated soil washing process, reclamation soil techniques of contaminated soil through use of structural instability of mordenite contained in contaminated soil under high temperature heating was testified and the following results were obtained; (1) Structural instability of Cs-typed typical native mordinite yielding in Tohoku area in Japan was observed and dissociation of $$^{137}$$Cs from this mordenite was found after heat annealing at 1173 K. (2) Remarkable dissociation rate in the early stages was observed and then was slowed down afterword. Dissociation rate of $$^{137}$$Cs reached up to 65% after 1173 K $$times$$ 1 hr annealing. (3) 100% recovery of Cs from vaporized Cs gas was achieved by technology combination of electric precipitation FP filter newly developed and cold trap.

Journal Articles

Thermal stability of BNCT neutron production target synthesized by ${it in-situ}$ lithium deposition and ion implantation

Ishiyama, Shintaro; Baba, Yuji; Fujii, Ryo*; Nakamura, Masaru*; Imahori, Yoshio*

Materials Transactions, 54(9), p.1760 - 1764, 2013/09

 Times Cited Count:4 Percentile:29.98(Materials Science, Multidisciplinary)

Li$$_{3}$$N synthesis on Li deposition layer was conducted without H$$_{2}$$O and O$$_{2}$$ by ${it in-situ}$ lithium deposition in high vacuum chamber of 10$$^{-6}$$ Pa and ion implantation techniques and the thermo-chemical stability of the Li$$_{3}$$N/Li/Cu tri-layered target under laser heating and air exposure was characterized by X-ray photoelectron spectroscopy. Following conclusions were derived; (1) Li$$_{3}$$N/Li/Cu tri- layered target with very low oxide and carbon contamination was synthesized by ${it in-situ}$ lithium deposition and ion implantation techniques without H$$_{2}$$O and O$$_{2}$$ additions and frequent synthesis of the target is possible. (2) The evaporating temperature of Li deposited layer increased by 120 K after forming the Li$$_{3}$$N layer on the surface of Li. (3) Remarkable oxidation and carbon contamination were observed on the surfaces of Li/Cu and Li$$_{3}$$N/Li/Cu after air exposure and these contaminated compositions formed on the surface of Li$$_{3}$$N/Li/Cu was not removed by Ar heavy sputtering.

144 (Records 1-20 displayed on this page)