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Journal Articles

Depth profiles of radioactive cesium in soil using a scraper plate over a wide area surrounding the Fukushima Dai-ichi Nuclear Power Plant, Japan

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:62 Percentile:4.15(Environmental Sciences)

Journal Articles

Degradation of charge collection efficiency obtained for 6H-SiC n$$^{+}$$p diodes irradiated with gold ions

Oshima, 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:19.89

no abstracts in English

Journal Articles

Design of pencil beam formation system for high-accuracy carbon-ion microsurgery

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

Journal Articles

Observation of charge collection efficiency of 6H-SiC n$$^{+}$$p diodes irradiated with Au-ions

Iwamoto, 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

Journal Articles

Research of disease onset mechanism by determining the distribution of intracellular trace elements using an in-air micro-PIXE analyzer system

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.

Journal Articles

Characterization of charge generated in silicon carbide n$$^{+}$$p diodes using transient ion beam-induced current

Oshima, 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:41.47(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.

Journal Articles

Analysis of transient current induced in silicon carbide diodes by oxygen-ion microbeams

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 6th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-6), p.177 - 180, 2004/10

no abstracts in English

Oral presentation

Design of the submillimeter-pencil beam transport system for carbon ion microsurgery therapy

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$$times$$1 mm, 30$$times$$30 mm and 3$$times$$3 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.

Oral presentation

Micro-ion-beam applications to life science

Fukuda, Mitsuhiro; Arakawa, Kazuo; Sato, Takahiro; Okumura, Susumu; Saito, Yuichi; Kashiwagi, Hirotsugu; Miyawaki, Nobumasa; Yuri, Yosuke; Ishii, Yasuyuki; Kobayashi, Yasuhiko; et al.

no journal, , 

no abstracts in English

Oral presentation

High-precision carbon-ion microsurgery system for the least invasive treatments of various tumors

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

Oral presentation

Decrease in charge collection efficiency of 6H-SiC n$$^{+}$$p diodes irradiated with Au ions

Iwamoto, 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

Oral presentation

Charge collection from 6H-SiC n$$^{+}$$p diodes irradiated with 12 MeV-Au ions

Iwamoto, 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

Oral presentation

Attempt at visualization and quantification of cisplatin in human lung cancer cell using in-air micro-PIXE

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

Oral presentation

TIBIC measurement of 6H-SiC p$$^{+}$$n diodes irradiated with oxygen and nickel ions

Iwamoto, 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 n$$^{+}$$p 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 n$$^{+}$$p 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.

Oral presentation

Study of high accuracy heavy-ion microsurgery therapy for Age-related Macular Degeneration (AMD)

Shimada, Hirofumi*; Oikawa, Masakazu*; Sato, Takahiro; Taguchi, Mitsumasa; Okumura, Susumu; Kato, Hiroyuki*; Yusa, Ken*; Sakai, Takuro; Fukuda, Mitsuhiro*; Sato, Taku*; et al.

no journal, , 

no abstracts in English

Oral presentation

Analysis of trace elements in lung by in-air micro-PIXE

Okamoto, Masahiko*; Sakurai, Hideyuki*; Shin, Masako*; Hasegawa, Masatoshi*; Oikawa, Masakazu*; Sato, Takahiro; Kamiya, Tomihiro; Arakawa, Kazuo; Nakano, Takashi*

no journal, , 

no abstracts in English

Oral presentation

Analysis of radiation-induced cell death in vivo by in-air micro-PIXE

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

Oral presentation

Design of ion optical system for high-precision carbon ion microsurgery beam line

Kamiya, Tomihiro; Oikawa, Masakazu*; Sato, Takahiro; Kashiwagi, Hirotsugu; Shimada, Hirofumi*; Arakawa, Kazuo; Yusa, Ken*; Nakano, Takashi*

no journal, , 

Oral presentation

Study on distribution and migration of radioactive substances around the Fukushima Daiichi Nuclear Power Plant, 2; Radiation monitoring and mapping of the radioactive substances distribution

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, ${it In-situ}$ 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.

Oral presentation

Study on distribution and migration of radioactive substances around the Fukushima Daiichi Nuclear Power Plant, 2; Radiation monitoring and mapping of the radiocesium distribution

Mikami, Satoshi; Nakano, Masakazu; Sato, Tetsuro; Uno, Kiichiro; Sato, Akane; Matsumoto, Shinichiro; Saito, Kimiaki

no journal, , 

The results of air dose rates measured by survey meters and ${it in-situ}$ $$gamma$$ spectrometry implemented as a fourth distribution investigation campaign in 2013 are to be introduced. In addition, spatial distribution of ratio of deposited Cs-134 and Cs-137 based on results of second campaign in 2011-2012 will be discussed.

24 (Records 1-20 displayed on this page)