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Journal Articles

Non-destructive elemental analysis of a carbonaceous chondrite with direct current Muon beam at MuSIC

Terada, Kentaro*; Sato, Akira*; Ninomiya, Kazuhiko*; Kawashima, Yoshitaka*; Shimomura, Koichiro*; Yoshida, Go*; Kawai, Yosuke*; Osawa, Takahito; Tachibana, Shogo*

Scientific Reports (Internet), 7(1), p.15478_1 - 15478_6, 2017/11

AA2017-0455.pdf:1.15MB

 Times Cited Count:15 Percentile:63.95(Multidisciplinary Sciences)

Electron- or X-ray-induced characteristic X-ray analysis has been widely used to determine chemical compositions of materials in vast research fields. In recent years, analysis of characteristic X-rays from muonic atoms, in which a muon is captured, has attracted attention because both a muon beam and a muon-induced characteristic X-ray have high transmission abilities. Here we report the first non-destructive elemental analysis of a carbonaceous chondrite using one of the world-leading intense direct current muon beam source (MuSIC; MUon Science Innovative Channel). We successfully detected characteristic muonic X-rays of Mg, Si, Fe, O, S and C from Jbilet Winselwan CM chondrite, of which carbon content is about 2 wt percent, and the obtained elemental abundance pattern was consistent with that of CM chondrites.

Journal Articles

Practice for reducing contamination of controlled area under the influence of Fukushima nuclear accident

Yoshitomi, Hiroshi; Tatebe, Yosuke; Kawai, Keiichi; Kowatari, Munehiko

Progress in Nuclear Science and Technology (Internet), 4, p.81 - 84, 2014/04

The Facility of Radiation Standards of the Japan Atomic Energy Agency provides various radiation fields for calibration and testing. It is located about 120 km away from Fukushima Dai-ichi Nuclear Power Plant, and radioactive materials discharged by the Fukushima nuclear accident contaminated around the FRS, even inside the building including radiation controlled areas. One month after the accident, the maximum contamination level in the controlled areas was 3.8 Bq/cm$$^2$$. $$^{134}$$Cs, $$^{137}$$Cs, $$^{131}$$I, $$^{132}$$Te and $$^{132}$$I were detected by $$gamma$$ spectrometry using an HPGe detector. However, contamination in controlled areas under widely contaminated environment have not been discussed in detail. As for FRS, practices for reducing contamination in the controlled areas were necessary to avoid the influence of the contamination to the calibration works. These practices described that the following two approaches were effective: (1) decontamination of the controlled areas by wiping out with wet cloth or steam cleaners, and (2) to prevent the dust with radioactive materials from letting in the controlled areas. As a result, surface contaminates inside the controlled areas were reduced to be dozens of times lower as compared with outside.

Journal Articles

Spin Seebeck insulator

Uchida, Kenichi*; Xiao, J.*; Adachi, Hiroto; Oe, Junichiro; Takahashi, Saburo; Ieda, Junichi; Ota, Takeru*; Kajiwara, Yosuke*; Umezawa, Hiromitsu*; Kawai, Hirotaka*; et al.

Nature Materials, 9(11), p.894 - 897, 2010/11

 Times Cited Count:1023 Percentile:99.88(Chemistry, Physical)

Thermoelectric generation is an essential function in future energy-saving technologies. However, it has so far been an exclusive feature of electric conductors, a situation which limits its application; conduction electrons are often problematic in the thermal design of devices. Here we report electric voltage generation from heat flowing in an insulator. We reveal that, despite the absence of conduction electrons, the magnetic insulator LaY$$_{2}$$Fe$$_{5}$$O$$_{12}$$ can convert a heat flow into a spin voltage. Attached Pt films can then transform this spin voltage into an electric voltage as a result of the inverse spin Hall effect. The experimental result require us to introduce a thermally activated interface spin exchange between LaY$$_{2}$$Fe$$_{5}$$O$$_{12}$$ and Pt. Our findings extend the range of potential materials for thermoelectric applications and provide a crucial piece of information for understanding the physics of the spin Seebeck effect.

Oral presentation

Radiation protection practices at the nuclear science research institute under the influence of Fukushima nuclear accident, 3; Implementation for reducing radioactive contamination in FRS

Yoshitomi, Hiroshi; Tatebe, Yosuke; Kawai, Keiichi; Kowatari, Munehiko; Nidaira, Atsushi; Fukami, Tomoyo; Sawahata, Katsunori

no journal, , 

no abstracts in English

Oral presentation

Influence of difference in structure of the beta calibration sources on calibration for personal dosimeters

Yoshitomi, Hiroshi; Tatebe, Yosuke; Kowatari, Munehiko; Kawai, Keiichi; Miyauchi, Hideaki; Yoshizawa, Michio

no journal, , 

no abstracts in English

Oral presentation

Development of low-dose rate photon calibration field in the range of $$mu$$Sv/h

Yoshitomi, Hiroshi; Tanimura, Yoshihiko; Tatebe, Yosuke; Kawai, Keiichi; Kowatari, Munehiko; Yoshizawa, Michio

no journal, , 

no abstracts in English

Oral presentation

An Attempt to introduction of the performance index for dose rate meter

Yoshitomi, Hiroshi; Tatebe, Yosuke; Kawai, Keiichi; Kowatari, Munehiko; Yoshizawa, Michio

no journal, , 

no abstracts in English

Oral presentation

Evalution of settlement at the upstream of the Mill Tailings Pond, Ningyo-toge Uranium Mine

Sasaki, Yosuke*; Takayama, Yusuke*; Ikuta, Yuki*; Iizuka, Atsushi*; Kawai, Katsuyuki*; Sakao, Ryota; Taki, Tomihiro

no journal, , 

As part of environmental remediation of Ningyo-toge Uranium Mine, multi-layered capping is constructed to reduce rainwater infiltration at the upstream of the Mill Tailings Pond. Settlement is expected due to consolidation characteristics of mill tailings and clayish sediments which exist below capping. Numerical simulation is carried out to expect the settlement amount during and after the capping construction. Settlement amount has been measured periodically, and the simulation result and measurement data are compared to evaluate the simulation method.

Oral presentation

Development on non-destructive muonic X-ray analysis of carbonaceous chondrites; Feasibility test for returned samples from C-type asteroids

Terada, Kentaro*; Sato, Akira*; Ninomiya, Kazuhiko*; Kawashima, Yoshitaka*; Shimomura, Koichiro*; Tomono, Dai*; Kawai, Yosuke*; Osawa, Takahito; Tachibana, Shogo*

no journal, , 

In recent years, analysis of characteristic X-rays from muonic atoms, in which a muon is captured, has attracted attention because both a muon beam and a muon-induced characteristic X-ray have high transmission abilities, of which energies are about 200 times higher. From these features, a muonic X-ray analysis has great advantages in several ways. At the conference, we will report on our recent progress of muonic X-ray analysis and discuss on a future prospect for applications for Earth and planetary science.

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