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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.
Hirata, Yuho; Kai, Takeshi; Ogawa, Tatsuhiko; Matsuya, Yusuke; Sato, Tatsuhiko
no journal, ,
The pulse-height defect in the heavy-ions measurement by the Si semiconductor detector is a problem of accurate measurement. Besides, soft errors that cause malfunctions of electronic devices are caused by the radiation interaction of Si semiconductor memory. To study the mechanism of these phenomena, we developed an electron track structure simulation code for Si material. In this work, we prepared the cross-sections for the track structure simulation for Si and calculated the energy transfer process of the radiation down to very low energy. The developed simulation code was implemented in PHITS and succeeded in calculating the electron track in Si. The epsilon value that is the energy required to generate an electron carrier, was calculated as 3.62 eV, which corresponds to the experimental value. For future work, we will analyze the pulse-height defect in the Si semiconductor detector using the developed track structure simulation code.
Watanabe, Kenichi*; Hitomi, Keitaro*; Nogami, Mitsuhiro*; Maeda, Shigetaka; Ito, Chikara; Tanno, Takashi; Onabe, Hideaki*
no journal, ,
TlBr is a compound semiconductor with a high atomic number, high density and a wide bandgap, and is being developed as a gamma-ray detector material that can be operated at room temperature and has high detection efficiency. There is neutron diffraction in order to establish a crystal quality evaluation method for improving the yield in device fabrication, but the facilities that can be implemented are limited to large facilities such as J-PARC. The Electron Backscatter Diffraction (EBSD) image, which is one of the electron beam diffractions, can be obtained with an electron microscope, but only the information on the crystal surface can be obtained. In this study, the crystal orientation image was acquired for the TlBr crystal by neutron Bragg dip imaging, which is one of the neutron diffractions, and EBSD. By comparing both images, the applicability to a simple EBSD crystal quality evaluation method was examined.
Nagai, Keiichi; Tei, C.; Otaka, Masahiko
no journal, ,
no abstracts in English
Oba, Masaki
no journal, ,
Spectral analysis by neural network was performed. The composition ratios of Gd and Ti were analyzed with Zr as an unknown element. The difference between analysis value and true value of elemental content was mostly within 0.2. It can be thought that the analysis of spectra can be performed even if unknown elements are mixed.
Honda, Mitsunori; Kaneta, Yui; Muraguchi, Masakazu*; Hayakawa, Kosetsu*; Oda, Masato*; Iino, Chiaki*; Ishii, Hiroyuki*; Goto, Takuya*; Yaita, Tsuyoshi
no journal, ,
Ten years have passed since the Great East Japan Earthquake and the accident at the Fukushima Daiichi Nuclear Power Plant, and the contaminated soil generated in Fukushima Prefecture has been decontaminated and managed as removal soil. We have been conducting research on the volume reduction and recycling of Fukushima weathered biotite, which is known to be a strong adsorbent of radioactive Cs contained in the removed soil. In this study, thermoelectric properties (Seebeck coefficient, electrical conductivity, and thermal diffusivity) of soil clay minerals and molten salt-electrolyzed soil clay minerals were evaluated in order to clarify their properties as thermoelectric materials.
/Si(001) interfacial oxidationTsuda, Yasutaka; Ogawa, Shuichi*; Yoshigoe, Akitaka; Tominaga, Aki; Sakamoto, Tetsuya; Yamamoto, Yoshiki*; Yamamoto, Yukio*; Takakuwa, Yuji*
no journal, ,
no abstracts in English
Wako, Toshinobu*; Hayakawa, Kosetsu*; Matsumura, Hiroshi*; Muraguchi, Masakazu*; Oda, Masato*; Iino, Chiaki*; Ishii, Hiroyuki*; Honda, Mitsunori
no journal, ,
This report investigates the effect of heat transfer due to contact with measurement terminals on the measurement results of thermoelectric material properties using heat transfer simulation. In thermoelectric conversion technology, miniaturization and thinning of elements are being studied for their compatibility with compact power supplies for the IoT, etc. In order to achieve this, it is necessary to accurately measure thermoelectric properties of minute materials, and it is essential to evaluate the results in the entire measurement system.
Hayakawa, Kosetsu*; Matsumura, Hiroshi*; Wako, Toshinobu*; Muraguchi, Masakazu*; Oda, Masato*; Iino, Chiaki*; Ishii, Hiroyuki*; Honda, Mitsunori
no journal, ,
We have been developing new thermoelectric materials from soil clay minerals treated by molten salt electrolysis, and have been evaluating their basic properties. In this study, we report the results of the measurement of thermal conductivity of soil clay minerals, which is essential for the determination of thermoelectric performance index.