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All Journal Makara Journal of Technology
Hidenori Mimura
Research Institute of Electronics, Shizuoka University, Hamamatsu, Shizuoka 432-8011, Japan
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Semiconductor Thermal Neutron Detector Aoki, Toru; Miyake, Aki; Nakano, Takayuki; Koike, Akifumi; Morii, Hisashi; Mimura, Hidenori
Makara Journal of Technology Vol. 17, No. 3
Publisher : UI Scholars Hub

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The CdTe and GaN detector with a Gd converter have been developed and investigated as a neutron detector for neutron imaging. The fabricated Gd/CdTe detector with the 25 mm thick Gd was designed on the basis of simulation results of thermal neutron detection efficiency and spatial resolution. The Gd/CdTe detector shows the detection of neutron capture gamma ray emission in the 155Gd(n, g)156Gd, 157Gd(n, g)158Gd and 113Cd(n, g)114Cd reactions and characteristic X-ray emissions due to conversion-electrons generated inside the Gd film. The observed efficient thermal neutron detection with the Gd/CdTe detector shows its promise in neutron radiography application. Moreover, a BGaN detector has also investigated to separate neutron signal from gamma-ray clearly.
Electron Emission Characteristics of Multi-gated Field Emitters Mimura, Hidenori; Neo, Yoichiro; Aoki, Toru; Yoshida, Tomoya; Nagao, Masayoshi
Makara Journal of Technology Vol. 18, No. 2
Publisher : UI Scholars Hub

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We have developed a multi-gated field emitter (FE) such as a quadruple-gated FE with a three-stacked electrode lens and a quintuple-gated FE with a four-stacked electrode lens. Both the FEs can focus the electron beam. However, the quintuple-gated FE has a stronger electron convergence than the quadruple-gated FE, and a beam crossover is clearly observed for the quintuple-gated FE.
Co-Authors Aki Miyake, Aki Akifumi Koike, Akifumi Hisashi Morii, Hisashi Masayoshi Nagao Takayuki Nakano, Takayuki Tomoya Yoshida Toru Aoki Yoichiro Neo