- 著者
- Kanetada NAGAMINE Hiroyuki K. M. TANAKA Satoshi N. NAKAMURA Katsuhiko ISHIDA Misao HASHIMOTO Akihiko SHINOTAKE Masaaki NAITO Asao HATANAKA
- 出版者
- The Japan Academy
- 雑誌
- Proceedings of the Japan Academy, Series B (ISSN:03862208)
- 巻号頁・発行日
- vol.81, no.7, pp.257-260, 2005 (Released:2005-11-07)
- 参考文献数
- 4
- 被引用文献数
- 15 31
By using the detection system of the near-horizontal cosmic-ray radiography originally developed for probing inner structure of volcanic mountains, a measurement was conducted to probe the inner structure and its time-dependent change of the blast furnace for iron-making. Precise determination (±5 cm) of the thickness of brick used for both base-plate and side-wall was made in 45 days; a crucial information to predict a life-time of the furnace. Also, the local density of iron-rich part was determined in ±0.2 g/cm2 in 45 days; static structure as well as time-dependent behavior can be monitored for the iron-rich part of the furnace during operation. (Communicated by Kazuhiko NISHIJIMA, M.J.A.)
- 著者
- László Oláh Gergő Hamar Shinichi Miyamoto Hiroyuki K. M. Tanaka Dezső Varga
- 出版者
- 社団法人 物理探査学会
- 雑誌
- 物理探査 (ISSN:09127984)
- 巻号頁・発行日
- vol.71, pp.161-168, 2018 (Released:2018-12-28)
- 参考文献数
- 42
- 被引用文献数
- 3 4
Muography is an emerging visualization technique for inspection of large-sized objects with the measurement of the absorption rate of cosmic-ray muons. Present paper introduces the first prototype of a Multi-Wire-Proportional-Camber (MWPC)-based borehole detector. The designed tracking system is based on the so-called Close Cathode Chamber (CCC) concept, which provides easily handling and robust detectors. The 18-cm-length detector is covering a sensitive area of 20 cm × 32 cm and an angular acceptance up to 60 deg with close to full tracking efficiency (99 %), reasonable position resolution of 1.8 mm and angular resolution of 10 mrad. The detector has been tested inside a shallow shaft and an underground iron pillar with concrete basement has successfully been imaged with the resolution of 15 cm within 15 days, which indicates the future industrial usage of MWPC detectors and encourages the application oriented development of this technology for borehole-based muography.
- 著者
- Taro KUSAGAYA Hiroyuki K. M. TANAKA
- 出版者
- 日本学士院
- 雑誌
- Proceedings of the Japan Academy, Series B (ISSN:03862208)
- 巻号頁・発行日
- vol.91, no.9, pp.501-510, 2015-11-11 (Released:2015-11-11)
- 参考文献数
- 30
- 被引用文献数
- 21
In conventional muography observations using two detectors for muon tracking, the accidental coincidence of vertical electromagnetic showers generates identical trajectories to the muon tracks. Although muography has favorable properties, which allow direct density measurements inside a volcano, the measured density is lower than the actual value due to these fortuitous trajectories. We performed muography of Usu volcano, and confirmed that, in comparison with a use of two detectors, background noise levels were reduced by more than one order of magnitude using seven detectors for selecting linear trajectories. The resultant muographic image showed a high-density region underneath the central region of Usu volcano. This picture is consistent with the magma intrusion model proposed in previous studies. To clarify the three-dimensional location and actual size of the detected high-density body, multidirectional muographic measurements are necessary.