Vol.2 No.3 2009

Research paper : Development of battery-operated portable high-energy X-ray sources (R. Suzuki)−227−Synthesiology - English edition Vol.2 No.3 (2009) References[1][2][3]http://www.aist.go.jp/aist_j/press_release/pr2009/pr20090319/pr20090319.html (in Japanese), http://www.aist.go.jp/aist_e/latest_research/2009/20090424/20090424.html (in English)TELL-TERAS Activity Report 1987-1990, Electrotechnical Laboratory, Japan (1990).R. Suzuki, K. Yamada, M. Koike, S. Ichimura, N. Sei, H. Toyokawa, H. Ogawa, M. Yasumoto, R. Kuroda, T. Ohdaira, A. Kinomura and N. Oshima: 50 % Reduction of energy AuthorRyoichi SuzukiCompleted the master’s course at the Graduate School of Engineering, University of Tsukuba in 1987. Obtained doctorate (Engineering) in 1991. Joined the Electrotechnical Laboratory, Agency of Industrial Science and Technology, Ministry of International Trade and Industry in 1987. Became the Senior Researcher of AIST in 2001. Engages in the generation and measurement of high-energy X-ray using the electron accelerator, and the development and application material evaluation technology using the high-intensity slow positron beam. Received the Ohm Technology Award (The Promotion Foundation for Electrical Science and Engineering) in 2004. Also received the Ichimura Award (New Technology Development Foundation) in 2005.Discussion with Reviewers1 Original technological development for downsizing the electron acceleratorQuestion and comment (Hisao Ichijo, Evaluation Division, AIST)In the description about downsizing the electron accelerator, it cannot be readily understood that it was your original technological development. I think you should cite your papers and patents and emphasize the fact that this was an original research result.Answer (Ryoichi Suzuki)In the electron accelerator research field, it has been widely known that downsizing could be accomplished by raising the acceleration frequency, and that itself is not original. However, we were the first to develop a small electron accelerator for generating positrons. I cited the paper that reported this technology at an academic society. Also, since this result is not the main theme of the paper, I added it to the section on the circumstances surrounding this research.2 Effort on the conceptual design of the battery-operated ultra-small electron acceleratorQuestion and comment (Hisao Ichijo)You wrote the “conceptual design” in the description for the development of the battery-operated ultra-small electron accelerator. I think you should include how you utilized the Actively looking for incompleteness or problems in elemental technologies and solving problems one at a time by incorporating different elemental technologies, may lead to new results because the linkages with other elemental technologies become clearer and stronger.5 Summary and future issuesThis paper described how the elemental technologies linked together toward the development of an X-ray source that operates on one AA battery and that can photograph high-resolution X-ray transmission images. The developed X-ray source not only can replace the conventional X-ray source as a single X-ray source, but it can be carried anywhere without warm-up, and progress of new X-ray nondestructive evaluations can be expected. To realize this, it is necessary to create a total system including a detector and a safety device as well as the X-ray source. Also, development of higher energy X-ray source using microwave acceleration techniques is necessary to handle inspections of large-scale structures.In the future, we wish to work on these topics and continue research that may bring true innovation to the field of X-ray evaluation.AcknowledgementThe development of the X-ray source using the carbon nanostructure was a joint research with Dialight Japan Co., Ltd. and Life Technology Research Institute Inc., under the 2008 R&D Project (to support small and medium businesses), AIST. Part of the development for the C-band electron accelerator was supported by the Budget for Nuclear Research of the Ministry of Education, Culture, Sports, Science and Technology of Japan, based on screening and counseling by the Atomic Energy Commission. We obtained cooperation of the Electron Accelerator Group, AIST. For energy saving renovation of the electron accelerator, we obtained cooperation of the Research Facilities Department, AIST and the Monitoring Room. Shingo Ichimura, Director, AIST introduced us to the companies manufacturing the carbon nanostructure. I am grateful to all the people who cooperated.[4][5][6][7]consumption in AIST electron accelerator facility, Proc. 3rd Annual Meeting of Particle Accelerator Society of Japan, 242-244 (2006).R. Suzuki: Generation of slow positron beam by an electron LINAC and its applications, Proc. 2nd Annual Meeting of Particle Accelerator Society of Japan, 82-86 (2005).R. Suzuki: Kandenchi de dosasuru chokogata denshi kasokuki (Ultra-small electron accelerator operating on batteries), Kensa Gijutsu, 13 (6), 5 (2008) (in Japanese).http://www.aist.go.jp/aist_j/press_release/pr2007/pr20071022/pr20071022.htmlF. Okumura: Kabon nanochubu o denshigen tosuru X sen kan (X-ray tube using carbon nanotube as electron source), Nihon Hoshasen Gijutsu Gakkai Zasshi, 58 (3), 309-313 (2002) (in Japanese).


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