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Matsuda, Norihiro; Mikami, Satoshi; Shimoura, Susumu*; Takahashi, Junko*; Nakano, Masakazu; Shimada, Kiyotaka*; Uno, Kiichiro; Hagiwara, Shigetomo; Saito, Kimiaki
Journal of Environmental Radioactivity, 139, p.427 - 434, 2015/01
Times Cited Count：111 Percentile：92.85(Environmental Sciences)
p diodes irradiated with gold ionsOshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu; Onoda, Shinobu; Hishiki, Shigeomi; Hirao, Toshio; Kamiya, Tomihiro; Yokoyama, Takuro*; Sakamoto, Airi*; Tanaka, Reisaburo*; et al.
Materials Science Forum, 556-557, p.913 - 916, 2007/00
Times Cited Count：4 Percentile：75.09(Materials Science, Ceramics)no abstracts in English
Arakawa, Kazuo; Oikawa, Masakazu*; Shimada, Hirofumi*; Kamiya, Tomihiro; Nakano, Takashi*; Yusa, Ken*; Kato, Hiroyuki*; Sato, Takahiro; Agematsu, Takashi; Kashiwagi, Hirotsugu; et al.
Proceedings of 4th Annual Meeting of Particle Accelerator Society of Japan and 32nd Linear Accelerator Meeting in Japan (CD-ROM), p.279 - 281, 2007/00
no abstracts in English
p diodes irradiated with Au-ionsIwamoto, Naoya; Oshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu*; Onoda, Shinobu; Hishiki, Shigeomi; Hirao, Toshio; Kamiya, Tomihiro; Yokoyama, Takuro*; Sakamoto, Airi*; et al.
Proceedings of 7th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-7), p.185 - 188, 2006/10
no abstracts in English
Nakano, Takashi*; Arakawa, Kazuo; Sakurai, Hideyuki*; Hasegawa, Masatoshi*; Yuasa, Kazuhisa*; Saito, Etsuko*; Takagi, Hitoshi*; Nagamine, Takeaki*; Kusakabe, Takahiko*; Takada, Hisashi*; et al.
International Journal of PIXE, 16(1&2), p.69 - 76, 2006/00
A new program was started out to create a new medical scientific field, which is consisting of radiation oncology and nuclear medicine, utilizing the advanced accelerator and ion beam technology. An in-air micro-PIXE analyzer system, which is among the most important technical basis of the program, was upgraded to improve accuracy of elemental mapping for samples having thickness variation in a scope of microbeam scanning. In the program, on the other hand, in order to approach important bio-medical problems on cancer, intracellular dynamics of the trace elements according to mechanism of development of diseases were studied using this system. This paper outlines this program and shows the system upgraded, and results of preliminary studied about the problems.
p diodes using transient ion beam-induced currentOshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu*; Yamakawa, Takeshi; Onoda, Shinobu; Wakasa, Takeshi; Laird, J. S.; Hirao, Toshio; Kamiya, Tomihiro; Ito, Hisayoshi; et al.
Nuclear Instruments and Methods in Physics Research A, 541(1-2), p.236 - 240, 2005/04
Times Cited Count：9 Percentile：54.50(Instruments & Instrumentation)In order to develop particle detectors based on SiC semiconductor, SiC pn-diodes were irradiated with microbeam of 15MeV oxygen ions. The transient current was measured using the single ion hit transient ion beam induced current (TIBIC) system at TIARA. As the results, peak intensity of transient current induded by ion irradiation increased and falltime decreased with increasing applied bias. By the integration of transient current, the charge collection was estimated. It was found that charges generated in deeper region beyond the depletion layer can be collected by the funneling effect.
Oshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu*; Yamakawa, Takeshi; Onoda, Shinobu; Wakasa, Takeshi; Laird, J. S.; Hirao, Toshio; Kamiya, Tomihiro; Ito, Hisayoshi; et al.
Proceedings of the 6th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-6), p.177 - 180, 2004/10
no abstracts in English
Suzuki, Hideaki*; Chijimatsu, Masakazu*; Fujita, Tomoo; Nakano, Masashi*
Doboku Gakkai Rombunshu, (701), p.107 - 120, 2002/03
None
p diodes irradiated with 12 MeV-Au ionsIwamoto, Naoya; Oshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu*; Onoda, Shinobu; Hishiki, Shigeomi; Hirao, Toshio; Kamiya, Tomihiro; Yokoyama, Takuro*; Sakamoto, Airi*; et al.
no journal, ,
no abstracts in English
n diodes irradiated with oxygen and nickel ionsIwamoto, Naoya; Onoda, Shinobu; Hishiki, Shigeomi; Mishima, Kenta; Oshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu*; Kamiya, Tomihiro; Sakamoto, Airi*; Nakano, Itsuo*; et al.
no journal, ,
Transient currents induced in 6H-SiC np by Ni and O ions were evaluated using Transient Ion Beam Induced Current (TIBIC). Charge Collection Efficiency (CCE) was estimated from TIBIC signals. As a results, CCE for 9 MeV-Ni and 9 MeV-O-irradiated 6H-SiC np diodes are 75 and 90 % respectively. From a simulation of ion tracks in which charge distribution and Auger recombination are considered, the origin of the decrease in CCE is explained in terms of the recombination of electron-hole pairs by Auger recombination in high ion beam induced carrier concentration.
Okamoto, Masahiko*; Sakurai, Hideyuki*; Shin, Masako*; Hasegawa, Masatoshi*; Oikawa, Masakazu*; Sato, Takahiro; Kamiya, Tomihiro; Arakawa, Kazuo; Nakano, Takashi*
no journal, ,
no abstracts in English
Hasegawa, Masatoshi*; Sakurai, Hideyuki*; Shin, Masako*; Okamoto, Masahiko*; Ishiuchi, Shogo*; Asakawa, Isao*; Tamamoto, Tetsuo*; Ono, Tatsuya*; Oikawa, Masakazu*; Kamiya, Tomihiro; et al.
no journal, ,
no abstracts in English
Mikami, Satoshi; Shimada, Kiyotaka; Nakano, Masakazu; Sato, Tetsuro; Sato, Akane; Uno, Kiichiro; Seki, Akiyuki; Matsumoto, Shinichiro; Saito, Kimiaki
no journal, ,
We conducted a monitoring and mapping of the radioactive substances distribution around the Fukushima Daiichi Nuclear Power Plant. In the area of 80 km radius from Fukushima Daiichi Nuclear Power Plant, 
measurements with portable Germanium detectors were conducted at approximately 380 points, and measurements with sureveymeters were done at approximately 6500 points. Newly acquired data were compared to the results obtained by the first or second investigation campaign in 2011.
Matsuda, Norihiro; Mikami, Satoshi; Nakano, Masakazu; Uno, Kiichiro; Hagiwara, Shigetomo; Yamamoto, Hideaki; Saito, Kimiaki
no journal, ,
no abstracts in English
Sato, Tetsuro*; Ando, Masaki; Uno, Kiichiro; Nakano, Masakazu; Kanno, Takashi; Yamamoto, Hideaki; Matsumoto, Shinichiro; Saito, Kimiaki
no journal, ,
The distribution of radioactive cesium were examined by man borne survey method by using KURAMA-II monitoring system. The correlation between the air dose rate measured by man borne survey method and the air dose rate measured by survey meters at 1 m above ground were examined. The correlation between the air dose rate measured by man borne survey method and the air dose rate measured by car borne survey were examined.
Arakawa, Kazuo; Fukuda, Mitsuhiro*; Shimada, Hirofumi*; Sakai, Takuro; Sato, Takahiro; Oikawa, Masakazu*; Agematsu, Takashi; Kashiwagi, Hirotsugu; Okumura, Susumu; Kurashima, Satoshi; et al.
no journal, ,
no abstracts in English
Mikami, Satoshi; Ishikawa, Daisuke; Nakano, Masakazu; Matsuda, Norihiro; Uno, Kiichiro; Sato, Akane; Matsumoto, Shinichiro; Yamamoto, Hideaki; Saito, Kimiaki
no journal, ,
Distributions of air dose rate and inventory of radioactive cesium deposited on ground were investigated in 2013, within 80-km radial area centered around the Fukushima Daiichi Nuclear Power Plant. We revealed the characteristics of the time-dependent change of the air dose rate and the inventory by comparison with the measurement results of the past investigations.
Kashiwagi, Hirotsugu; Oikawa, Masakazu*; Shimada, Hirofumi*; Yuri, Yosuke; Agematsu, Takashi; Ishii, Yasuyuki; Saito, Yuichi; Sakai, Takuro; Okumura, Susumu; Kurashima, Satoshi; et al.
no journal, ,
The areas of age-related macular degeneration, tumor in brain pituitary and vascular lesions such as AVM (Arterio Venous Malformation) to be treated are 1
1 mm, 3030 mm and 33 mm respectively. To treat these by heavy ion beam instead of surgical operation, not only the spatial resolution of the beam should be 100 micrometer to 1 mm, but also the formation of it be pencil-shaped, so that the diameter of beam hardly depends on the depth of it in the target. The pencil beam transport system was studied and designed for carbon microsurgery therapy, as a part of the 21st century COE program. In this study, one of the vertical beam lines of a heavy ion therapy facility to be constructed in Gunma University was a model for beam optics calculations. The parameters of the magnetic components such as bending magnets and quadrupole ones, were optimized to obtain a sub-millimeter beam on the target. The range shifter is inserted in the beam line to form spread out bragg peak. Effect of inserting range shifters were also estimated, especially for growth of beam emittance by scattering in the further calculation. The total layout of this system and the beam optics simulations are explained in detail in the poster session.
p diodes irradiated with Au ionsIwamoto, Naoya; Oshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu; Onoda, Shinobu; Hishiki, Shigeomi; Hirao, Toshio; Kamiya, Tomihiro; Yokoyama, Takuro*; Sakamoto, Airi*; et al.
no journal, ,
no abstracts in English
Sakurai, Hideyuki*; Okamoto, Masahiko*; Shin, Masako*; Takeuchi, Aiko*; Hasegawa, Masatoshi*; Sato, Takahiro; Oikawa, Masakazu*; Kamiya, Tomihiro; Arakawa, Kazuo; Nakano, Takashi*
no journal, ,
no abstracts in English
