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Fujita, Natsuko; Miyake, Masayasu; Matsubara, Akihiro*; Ishii, Masahiro*; Watanabe, Takahiro; Jinno, Satoshi; Nishio, Tomohiro*; Ogawa, Yumi; Kimura, Kenji; Shimada, Akiomi; et al.
Dai-35-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.17 - 19, 2024/03
The JAEA-AMS-TONO facility at the Tono Geoscience Center, JAEA has three accelerator mass spectrometers. We report the present status of the JAEA-AMS-TONO.
Matsubara, Akihiro*; Fujita, Natsuko; Miyake, Masayasu; Ishii, Masahiro*; Watanabe, Takahiro; Kokubu, Yoko; Nishio, Tomohiro*; Ogawa, Yumi; Jinno, Satoshi; Kimura, Kenji; et al.
JAEA-Conf 2022-002, p.55 - 62, 2023/03
We report the present status of the JAEA-AMS-TONO. Particularly, the destructions of varistors used in the beamline equipment will be presented. The cause of the destruction as well as implementation of the safety measures are mentioned.
Fujita, Natsuko; Miyake, Masayasu; Matsubara, Akihiro*; Ishii, Masahiro*; Watanabe, Takahiro; Jinno, Satoshi; Nishio, Tomohiro*; Ogawa, Yumi; Yamamoto, Yusuke; Kimura, Kenji; et al.
Dai-23-Kai AMS Shimpojiumu Hokokushu, p.1 - 4, 2022/12
The JAEA-AMS-TONO facility at the Tono Geoscience Center, JAEA has three accelerator mass spectrometers. We report the present status of the JAEA-AMS-TONO.
Fujita, Natsuko; Matsubara, Akihiro; Kimura, Kenji; Jinno, Satoshi; Kokubu, Yoko
Nuclear Instruments and Methods in Physics Research B, 532, p.13 - 18, 2022/12
Times Cited Count：1 Percentile：33.4(Instruments & Instrumentation)Over the last decade, significant technological advances were made to downsize the AMS systems. Japan Atomic Energy Agency has started a project for developing a prototype downsized AMS system (with the footprint of the system is 1.9 m 
1.9 m) based on the surface stripper technique. Although the system configuration using an ion source, magnets, and detectors is similar to that in conventional systems, there is no tandem accelerator as well as a gas stripper. The ion acceleration is provided in the ion source (maximum ion energy 40 keV). For proof-of-principle experiments, we have planned two steps: (1) Observation of the specular reflection and the dissociation by using a compact electrostatic analyzer located just behind the stripper, and (2) Demonstration of 
C measurement, along with the experimental confirmation of the isobar suppression capability of the surface stripper.
Nakano, Masanao; Hosomi, Kenji; Nishimura, Shusaku; Matsubara, Natsumi; Okura, Takehisa; Kuramochi, Akihiko; Kawasaki, Masatsugu; Takeuchi, Erina; Fujii, Yutaka*; Jinno, Tsukasa*; et al.
Hoken Butsuri (Internet), 55(2), p.102 - 109, 2020/06
After the Fukushima-Daiichi Nuclear Power Station (1F) Accident in March 2011, the increase was significantly observed in a part of the result of the environmental radiation monitoring in Ibaraki prefecture. "The review meeting of the environmental effect from 1F accident" was established to discuss technically the fluctuation of monitoring data. The review meeting collected the monitoring data from the four nuclear operators, and discussed a fluctuating trend, 
Cs/
Cs activity ratio, and so on. In this report, the results of the dose rate and Cs in fallout, surface soil, flatfish and seabed sediment are introduced. Also the problem solving in the review meeting is introduced.
Saeki, Kazutoshi*; Nakagawa, Kei*; Wada, Shinichiro*; Shibata, Masahiro; Horoshiro, Yoshinari*; Jinno, Kenji*
Nendo Kagaku, 42(1), p.1 - 5, 2002/08
None
Jinno, Kenji*; *; *; *; *; *; *
JNC TY8400 2002-011, 160 Pages, 2002/07
JNC-TY8400-2002-011.pdf:17.47MB
no abstracts in English
Ezaki, Tetsuro*; Jinno, Kenji*; *; *; Uchida, Masahiro; Yoshino, Naoto
JNC TY8400 2002-006, 164 Pages, 2002/06
JNC-TY8400-2002-006.pdf:12.69MB
no abstracts in English
; Jinno, Kenji*; Saeki, Kazutoshi*; *; *; Tagomori, Hisaya*
Sui Kogaku Rombunshu, 46, p.205 - 210, 2002/00
None
Ezaki, Tetsuro*; Jinno, Kenji*; Mitani, Yasuhiro*; *; Uchida, Masahiro; Yoshino, Naoto
JNC TY8400 2001-005, 93 Pages, 2001/06
JNC-TY8400-2001-005.pdf:19.32MB
no abstracts in English
Ezaki, Tetsuro*; Jinno, Kenji*; Mitani, Yasuhiro*; *; Uchida, Masahiro; *
JNC TY8400 2000-004, 94 Pages, 2000/03
JNC-TY8400-2000-004.pdf:7.73MB
no abstracts in English
Nakagawa, Kei*; Jinno, Kenji*; Ijiri, Yuji; Watari, Shingo; ; Uchida, Masahiro
JNC TY8400 99-005, 121 Pages, 1999/06
no abstracts in English
Jinno, Kenji*; Nakagawa, Kei*; *; *; Ijiri, Yuji*; *; Watari, Shingo
PNC TY1606 98-001, 54 Pages, 1998/03
no abstracts in English
Jinno, Kenji*; Nakagawa, Kei*; *; ; Ijiri, Yuji*; Watari, Shingo; Webb, E. K.*; Kanazawa, Yasuo*; Uchida, Masahiro
PNC TY1606 97-001, 44 Pages, 1997/03
no abstracts in English
Jinno, Satoshi; Matsubara, Akihiro; Fujita, Natsuko; Kimura, Kenji
no journal, ,
We have been developing a small accelerator mass spectrometer dedicated to carbon-14 using a surface stripper. In order to demonstrate the principle, we will evaluate the charge distribution and scattering angle spread of carbon-negative ions (C
) after passing through the surface stripper using a two-dimensional detector, and compare the results with numerical calculations. In order to clarify the correlation between the scattering angle of ions and the secondary electron emission, we have designed a detector to measure the secondary electron emission from the crystal surface. We plan to use this device to evaluate the health of the crystal surface.
Matsubara, Akihiro; Jinno, Satoshi; Fujita, Natsuko; Kimura, Kenji
no journal, ,
We numerically estimated the suppression efficiency of the surface stripper in the case of the grazing incidence of the 
CH with energy of tens of keV onto a single crystal surface, in consideration of the energy distribution of the surface electron seen from the restframe of the moving projectile.
Fujita, Natsuko; Jinno, Satoshi; Matsubara, Akihiro*; Kimura, Kenji
no journal, ,
We have been developing a downsized AMS with a size of about 2 m 2 m. This AMS is developed to demonstrate a new method of separating same-mass molecules, which are interfering nuclides during AMS measurement of carbon-14, using ion channeling.
Jinno, Satoshi; Matsubara, Akihiro*; Fujita, Natsuko; Kimura, Kenji
no journal, ,
We have been developing a downsized accelerator mass spectrometer dedicated to carbon-14 using a surface stripper. In order to demonstrate the practical application of C measurement, we have performed surface scattering experiments using KCl crystals; C was obliquely incident on the KCl crystals, and the rate of charge conversion of specularly reflected particles was calculated. In addition, we adjusted the beam of positive ions after charge conversion, detected dissociated fragments downstream of the analyzing magnet, and confirmed the operation of the ion detector with proportional counters.
Fujita, Natsuko; Miyake, Masayasu; Matsubara, Akihiro*; Ishii, Masahiro*; Jinno, Satoshi; Watanabe, Takahiro; Nishio, Tomohiro*; Ogawa, Yumi; Kimura, Kenji; Shimada, Akiomi; et al.
no journal, ,
The JAEA-AMS-TONO facility at the Tono Geoscience Center, JAEA has three accelerator mass spectrometers. We report the present status of the JAEA-AMS-TONO.
Jinno, Satoshi; Matsubara, Akihiro*; Fujita, Natsuko; Kimura, Kenji
no journal, ,
We are developing a downsized AMS specialized for carbon-14 (C) measurement for industrial use at the JAEA Tono Geoscience Center. When an acceleration voltage of less than 100 kV is used for miniaturization, the angular spread and energy dispersion of the beam become large due to collisions with gas strippers. It results in a restriction of the detection limit. To overcome this problem, we conceived of a surface stripper based on specular scattering of ions on a crystal surface. The size of the test apparatus is approximately 2 m2 m, which is one of the smallest in the world for AMS. Currently, we are verifying surface scattering experiments using KCl crystals.
Fujita, Natsuko; Matsubara, Akihiro*; Jinno, Satoshi; Kimura, Kenji
no journal, ,
The downsized AMS is about 2 m 2 m in size and is used to demonstrate a new method1) of separating C-14 from the same mass molecules that would interfere with the AMS measurement of carbon-14 using surface channeling. This development is expected to lead to the widespread use of C-14 for the measurement of biomass in plastic products and C-14 concentration in biological samples for pharmaceutical development, as well as the realization of in-situ measurement in field surveys for geological and environmental studies. This will encourage rapid expansion of the AMS community.
