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Tachibana, Mitsuo; Ito, Hirokuni*; Hatakeyama, Mutsuo*; Yanagihara, Satoshi
Nihon Genshiryoku Gakkai Wabun Rombunshi, 3(1), p.120 - 127, 2004/03
The RAPID-1600 was developed to measure a low-level radioactive contamination on building surfaces automatically. The double layered detectors are structured by two gas flow type detectors with a 
rays shielding plate between the two detectors and it is horizontally positioned. The lower counter measures and 
rays and the upper counter measures rays. The rays counting rates are derived by subtracting rays counting rates of the upper counter from and rays counting rates of the lower counter. This mechanism results in sensitive to rays against to low background radiation conditions. The driving unit can move omnidirectionally by controlling two driving wheels individually, and has a capability to correct its position if an orbital error is detected by the self-position identification system. The RAPID-1600 was successfully applied to the actual measurement in the radioisotope production facilities. The RAPID-1600 is expected to be a useful tool for measurement of radioactivity in decommissioning nuclear facilities.
Ito, Hirokuni*; Hatakeyama, Mutsuo*; Tachibana, Mitsuo; Yanagihara, Satoshi
JAERI-Tech 2003-012, 34 Pages, 2003/03
JAERI-Tech-2003-012.pdf:2.87MB
The MISE was developed to evaluate low-level radiological contaminations of inner surfaces of piping. The MISE consists of a cylindrically-formed double layered type detector and a piping crawling robot, which were designed and manufactured separately. In measurements of the contaminations, an outer cylindrical detector close to the surface of piping measures -rays and -rays and an inner cylindrical detector set after a shielding plate for shield of -rays measures -rays. The -ray counting rates are derived by subtracting -ray counts measured by the inner detector from - and -ray counts measured by the outer detector. The robot transports the double layered type detector with observing inner surfaces of piping. The detection limit for the contamination of 
Co was found to be about 0.17Bq/cm
with measurement time of 30 seconds. It is expected that 0.2Bq/cm corresponding to clearance level of Co (0.4Bq/g) can be evaluated with measurement time of 2 seconds, which is equal to measurement speed of 54m/h.
Tachibana, Mitsuo; Ito, Hirokuni; Shimada, Taro; Yanagihara, Satoshi
Proceeding of International Waste Management Symposium 2002 (WM '02) (CD-ROM), 8 Pages, 2002/00
Automatic measurement of radioactivity is necessary for considering cost effectiveness in final radiological survey of building structures in decommissioning nuclear facilities. The RAPID (radiation measuring pilot device for surface contamination) was developed to be applied to automatic measurement of low level contamination on concrete surfaces. The RAPID has a capability to measure contamination with detection limit of 0.14 Bq/cm for Co in 30 seconds of measurement time and its efficiency is evaluated to be 5 m/h in a normal measurement option. It was confirmed that low level contamination on concrete surfaces could be surveyed by the RAPID efficiently compared with direct measurement by workers through its actual application.
Yanagihara, Satoshi; Hatakeyama, Mutsuo; Ito, Hirokuni; Mori, Shunji*; Takagi, Akira*
Advanced Robotics, 15(3), p.293 - 300, 2001/06
Times Cited Count：1 Percentile：10.04(Robotics)Automatic measurement of building surface radioactivity must be a useful approach for decommissioning and maintenance activities in nuclear facilities. In particular, in the final step of decommissioning a nuclear power plant, it is essential to confirm that there is no effective radioactivity on building surfaces by measurement. However, experience showed that hands-on measurement using conventional detectors requires a great deal of labor-hours for all building surfaces in relatively large facilities. To realize the automatic measurement of building surface radioactivity, a mobile robot equipped with highly sensitive surface detectors has been developed; it can move automatically based on route plans to measure radioactivity on concrete floors and walls. In the development of this system, efforts were especially made to realize accurate robot motions by applying self-position identification system in consideration of the fact that the measurement should cover all the surfaces of planned areas with minimum overlap.
Hatakeyama, Mutsuo; Ito, Hirokuni; Yanagihara, Satoshi
JAERI-Tech 2000-056, 38 Pages, 2000/09
JAERI-Tech-2000-056.pdf:5.23MB
no abstracts in English
Sakasai, Kaoru; Ara, Katsuyuki; Ito, Hirokuni; Kishimoto, Maki; Katagiri, Masaki
Review of Scientific Instruments, 65(5), p.1657 - 1662, 1994/05
Times Cited Count：2 Percentile：36.75(Instruments & Instrumentation)no abstracts in English
SrCaCuO
high-Tc superconductors by using a planar coilAra, Katsuyuki; Katagiri, Masaki; Ito, Hirokuni; Sakasai, Kaoru
Nihon Oyo Jiki Gakkai-Shi, 18(2), p.703 - 708, 1994/00
no abstracts in English
Katagiri, Masaki; Ito, Hirokuni
Radiation Detectors and Their Uses,Proc of 8th Workshop; KEK Proc. 94-7, 0, p.174 - 178, 1994/00
no abstracts in English
SrCaCuO under low magnetic fields applied by a planar coilAra, Katsuyuki; Katagiri, Masaki; Ito, Hirokuni; Sakasai, Kaoru
Journal of Applied Physics, 73(1), p.471 - 473, 1993/01
Times Cited Count：0 Percentile：0.00(Physics, Applied)no abstracts in English
Sakasai, Kaoru; Ara, Katsuyuki; Ito, Hirokuni; Kishimoto, Maki; Katagiri, Masaki;
MAG-93-9, p.71 - 76, 1993/01
no abstracts in English
Katagiri, Masaki; Kishimoto, Maki; Ito, Hirokuni; ; Fukushima, Masao; Okawa, Hiroshi;
Nuclear Instruments and Methods in Physics Research A, 327, p.463 - 468, 1993/00
Times Cited Count：3 Percentile：42.99(Instruments & Instrumentation)no abstracts in English
Katagiri, Masaki; Ito, Hirokuni;
JAERI-M 92-184, 69 Pages, 1992/11
no abstracts in English
Katagiri, Masaki; Kishimoto, Maki; Ito, Hirokuni; Fukushima, Masao; Okawa, Hiroshi; ; ; Tobita, Tsutomu
Journal of Nuclear Science and Technology, 29(10), p.957 - 965, 1992/10
no abstracts in English
Katagiri, Masaki; Ito, Hirokuni;
Journal of Nuclear Science and Technology, 29(9), p.831 - 841, 1992/09
no abstracts in English
Katagiri, Masaki; Hatakeyama, Mutsuo; ; Ito, Hirokuni;
Journal of Nuclear Science and Technology, 29(8), p.735 - 744, 1992/08
no abstracts in English
SrCaCuO disk by a planar coil and magnetic flux penetrationAra, Katsuyuki; Katagiri, Masaki; Ito, Hirokuni; Sakasai, Kaoru
MAG-92-124, p.21 - 30, 1992/07
no abstracts in English
Katagiri, Masaki; Kishimoto, Maki; Terada, Hiromi; ; ; ; Ito, Hirokuni; ; Kobayashi, Fumiaki
IEEE Transactions on Nuclear Science, 37(3), p.1400 - 1404, 1990/06
Times Cited Count：3 Percentile：45.00(Engineering, Electrical & Electronic)no abstracts in English
Koizumi, Mitsuo; Takahashi, Tone; Mochimaru, Takanori*; Yamaguchi, Ikuto*; Yoshimi, Yuki*; Yamanishi, Hirokuni*; Wakabayashi, Genichiro*; Tanigaki, Minoru*; Harada, Hiroshi*; Masaki, Hiroko*; et al.
no journal, ,
no abstracts in English
Takahashi, Tone; Koizumi, Mitsuo; Mochimaru, Takanori*; Yamaguchi, Ikuto*; Yoshimi, Yuki*; Yamanishi, Hirokuni*; Wakabayashi, Genichiro*; Tanigaki, Minoru*; Harada, Hiroshi*; Masaki, Hiroko*; et al.
no journal, ,
no abstracts in English
Yamaguchi, Ikuto*; Koizumi, Mitsuo; Takahashi, Tone; Mochimaru, Takanori*; Yoshimi, Yuki*; Yamanishi, Hirokuni*; Wakabayashi, Genichiro*; Tanigaki, Minoru*; Harada, Hiroshi*; Masaki, Hiroko*; et al.
no journal, ,
no abstracts in English
Mochimaru, Takanori*; Koizumi, Mitsuo; Takahashi, Tone; Yamaguchi, Ikuto*; Yoshimi, Yuki*; Yamanishi, Hirokuni*; Wakabayashi, Genichiro*; Tanigaki, Minoru*; Harada, Hiroshi*; Masaki, Hiroko*; et al.
no journal, ,
no abstracts in English
