The Experts below are selected from a list of 8229 Experts worldwide ranked by ideXlab platform
Mihiro Takemori - One of the best experts on this subject based on the ideXlab platform.
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Dependence of neutrons generated by 7Li(p,n) reaction on Li thickness under Free-Air Condition in accelerator-based boron neutron capture therapy system employing solid-state Li target.
Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Associ, 2019Co-Authors: Satoshi Nakamura, Hiroshi Igaki, Hiroyuki Okamoto, Akihisa Wakita, Masashi Ito, Shoji Imamichi, Shie Nishioka, Kotaro Iijima, Hiroki Nakayama, Mihiro TakemoriAbstract:Abstract Purpose An accelerator-based boron neutron capture therapy (BNCT) system with a solid-state Li target is reported to have degradation of the Li target. The degradation reduces the Li thickness, which may change spectra of the generated neutrons corresponding to the Li thickness. This study aims to examine the relationship between the Li thickness and the generated neutrons and to investigate the effects of the Li thickness on the absorbed dose in BNCT. Method The neutron energy spectra were calculated via Monte Carlo simulation for Li thicknesses ranging from 20 to 150 μm. Using the system, the saturated radioactivity of gold induced by reactions between 197Au and the generated neutrons was evaluated with the simulation and the measurement, and those were compared. Additionally, for each Li thickness, the saturated radioactivity was compared with the number of generated neutrons. The absorbed doses delivered by 10B(n,α)7Li, 14N(n,p)14C, 1H(n, g)2H, and (n,n′) reactions in water were also calculated for each Li thickness. Results The measurement and simulation indicated a reduction in the number of neutrons due to the degradation of the Li target. However, the absorbed doses were comparable for each Li thickness when the requisite number of neutrons for BNCT was delivered. Additionally, the saturated radioactivity of 198Au could be a surrogate for the number of neutrons even if the Li thickness was varied. Conclusions No notable effect to the absorbed dose was observed when required neutron fluence was delivered in the BNCT even if the degradation of the Li was observed.
Satoshi Nakamura - One of the best experts on this subject based on the ideXlab platform.
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Dependence of neutrons generated by 7Li(p,n) reaction on Li thickness under Free-Air Condition in accelerator-based boron neutron capture therapy system employing solid-state Li target.
Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Associ, 2019Co-Authors: Satoshi Nakamura, Hiroshi Igaki, Hiroyuki Okamoto, Akihisa Wakita, Masashi Ito, Shoji Imamichi, Shie Nishioka, Kotaro Iijima, Hiroki Nakayama, Mihiro TakemoriAbstract:Abstract Purpose An accelerator-based boron neutron capture therapy (BNCT) system with a solid-state Li target is reported to have degradation of the Li target. The degradation reduces the Li thickness, which may change spectra of the generated neutrons corresponding to the Li thickness. This study aims to examine the relationship between the Li thickness and the generated neutrons and to investigate the effects of the Li thickness on the absorbed dose in BNCT. Method The neutron energy spectra were calculated via Monte Carlo simulation for Li thicknesses ranging from 20 to 150 μm. Using the system, the saturated radioactivity of gold induced by reactions between 197Au and the generated neutrons was evaluated with the simulation and the measurement, and those were compared. Additionally, for each Li thickness, the saturated radioactivity was compared with the number of generated neutrons. The absorbed doses delivered by 10B(n,α)7Li, 14N(n,p)14C, 1H(n, g)2H, and (n,n′) reactions in water were also calculated for each Li thickness. Results The measurement and simulation indicated a reduction in the number of neutrons due to the degradation of the Li target. However, the absorbed doses were comparable for each Li thickness when the requisite number of neutrons for BNCT was delivered. Additionally, the saturated radioactivity of 198Au could be a surrogate for the number of neutrons even if the Li thickness was varied. Conclusions No notable effect to the absorbed dose was observed when required neutron fluence was delivered in the BNCT even if the degradation of the Li was observed.
Kaobayashi Kazuhiko - One of the best experts on this subject based on the ideXlab platform.
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Ozone Concentration Enrichment System Under Fully Free-Air Condition in Agricultural Field(O_3-FACE)
2010Co-Authors: Kaobayashi KazuhikoAbstract:The first Free Air Ozone Concentration Enrichment system(O3-FACE) was established in Asia under rice-wheat rotation system.The O3-FACE included O3 gas supply unit,O3 gas controlled-release unit and system communication and monitoring unit.The target O3 concentration for the FACE plots was 50% higher than the instantaneous ambient O3 concentration in the control plots.The O3 gas release was controlled at each FACE ring with a logic based on wind direction,wind speed and O3 concentration at the center of the plot.Based on 3 years results,the achieved fluctuation of O3 concentration was within ±15% of the target value for 85% of the time,and within ±20% of the target value for 90% of the time.The O3 concentration reduced in the FACE ring from border to center along the main wind direction.The variation of O3 distribution in FACE ring was lower than ±10% compared with O3 concentration at the center of the plot.The achieved fluctuation of O3 concentration was within ±20% of the target value for 80% of the time under low wind speed Condition(wind speed0.3 m/s).
Hiroyuki Okamoto - One of the best experts on this subject based on the ideXlab platform.
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Dependence of neutrons generated by 7Li(p,n) reaction on Li thickness under Free-Air Condition in accelerator-based boron neutron capture therapy system employing solid-state Li target.
Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Associ, 2019Co-Authors: Satoshi Nakamura, Hiroshi Igaki, Hiroyuki Okamoto, Akihisa Wakita, Masashi Ito, Shoji Imamichi, Shie Nishioka, Kotaro Iijima, Hiroki Nakayama, Mihiro TakemoriAbstract:Abstract Purpose An accelerator-based boron neutron capture therapy (BNCT) system with a solid-state Li target is reported to have degradation of the Li target. The degradation reduces the Li thickness, which may change spectra of the generated neutrons corresponding to the Li thickness. This study aims to examine the relationship between the Li thickness and the generated neutrons and to investigate the effects of the Li thickness on the absorbed dose in BNCT. Method The neutron energy spectra were calculated via Monte Carlo simulation for Li thicknesses ranging from 20 to 150 μm. Using the system, the saturated radioactivity of gold induced by reactions between 197Au and the generated neutrons was evaluated with the simulation and the measurement, and those were compared. Additionally, for each Li thickness, the saturated radioactivity was compared with the number of generated neutrons. The absorbed doses delivered by 10B(n,α)7Li, 14N(n,p)14C, 1H(n, g)2H, and (n,n′) reactions in water were also calculated for each Li thickness. Results The measurement and simulation indicated a reduction in the number of neutrons due to the degradation of the Li target. However, the absorbed doses were comparable for each Li thickness when the requisite number of neutrons for BNCT was delivered. Additionally, the saturated radioactivity of 198Au could be a surrogate for the number of neutrons even if the Li thickness was varied. Conclusions No notable effect to the absorbed dose was observed when required neutron fluence was delivered in the BNCT even if the degradation of the Li was observed.
Akihisa Wakita - One of the best experts on this subject based on the ideXlab platform.
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Dependence of neutrons generated by 7Li(p,n) reaction on Li thickness under Free-Air Condition in accelerator-based boron neutron capture therapy system employing solid-state Li target.
Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Associ, 2019Co-Authors: Satoshi Nakamura, Hiroshi Igaki, Hiroyuki Okamoto, Akihisa Wakita, Masashi Ito, Shoji Imamichi, Shie Nishioka, Kotaro Iijima, Hiroki Nakayama, Mihiro TakemoriAbstract:Abstract Purpose An accelerator-based boron neutron capture therapy (BNCT) system with a solid-state Li target is reported to have degradation of the Li target. The degradation reduces the Li thickness, which may change spectra of the generated neutrons corresponding to the Li thickness. This study aims to examine the relationship between the Li thickness and the generated neutrons and to investigate the effects of the Li thickness on the absorbed dose in BNCT. Method The neutron energy spectra were calculated via Monte Carlo simulation for Li thicknesses ranging from 20 to 150 μm. Using the system, the saturated radioactivity of gold induced by reactions between 197Au and the generated neutrons was evaluated with the simulation and the measurement, and those were compared. Additionally, for each Li thickness, the saturated radioactivity was compared with the number of generated neutrons. The absorbed doses delivered by 10B(n,α)7Li, 14N(n,p)14C, 1H(n, g)2H, and (n,n′) reactions in water were also calculated for each Li thickness. Results The measurement and simulation indicated a reduction in the number of neutrons due to the degradation of the Li target. However, the absorbed doses were comparable for each Li thickness when the requisite number of neutrons for BNCT was delivered. Additionally, the saturated radioactivity of 198Au could be a surrogate for the number of neutrons even if the Li thickness was varied. Conclusions No notable effect to the absorbed dose was observed when required neutron fluence was delivered in the BNCT even if the degradation of the Li was observed.
