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Iwai Y.,Onizuka Glass Corporation | Iwai Y.,Incubation Alliance Incorporated | Muramatsu K.,Incubation Alliance Incorporated | Tsuboi S.,Onizuka Glass Corporation | And 4 more authors.
Applied Physics Express | Year: 2013

We have successfully fabricated a filament-less X-ray tube using a graphene flower cloth (GFC) field emission cathode. The GFC has numerous nanoprotrusions formed by self-standing graphene structures. The field emission current and the field enhancement factor β were 500 μA and 5600, respectively. The stability of voltage defined as a variance coefficient (σ/mean) of voltage was calculated to be 0.04% while maintaining the X-ray tube current of 300 μA. We applied our X-ray tube with the GFC field emitter to the X-ray fluorescence (XRF) analysis of stainless steel. © 2013 The Japan Society of Applied Physics. Source


Jyouzuka A.,Onizuka Glass Corporation | Jyouzuka A.,University of Shizuoka | Nakamura T.,Onizuka Glass Corporation | Onizuka Y.,Onizuka Glass Corporation | And 3 more authors.
Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics | Year: 2010

The emission characteristics of graphite nanospines (GNSs) encapsulated in an x-ray tube with a system for controlling electric field crowding (SCEFC) are investigated. GNSs encapsulated in an x-ray tube can be driven at an anode current (IA) of more than 1 mA. Further, IA can be controlled using the SCEFC. During the operation of the x-ray tube with GNSs and the SCEFC at the anode voltage of 12.5 kV and IA of 640 μA for 100 h, there was no degradation in IA. The noise current superimposed on IA was observed to be ±34.5 μA. It was reduced to ±1.62 μA by using the SCEFC. The authors also demonstrated radiography and x-ray fluorescence measurement as applications of x-ray tubes with GNSs and the SCEFC. © 2010 American Vacuum Society. Source


Iwai Y.,Onizuka Glass Corporation | Iwai Y.,University of Shizuoka | Koike T.,Onizuka Glass Corporation | Hayama Y.,Onizuka Glass Corporation | And 5 more authors.
Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics | Year: 2013

The authors developed a class of novel graphite-based field emitters, known as graphite field emitters inflamed at high temperature (GFEIHTs), which includes numerous edges and juts. The GFEIHT field emission characteristics are investigated in a vacuum tube (10-7 Pa), and an anode current exceeding 2 mA is obtained. The authors also fabricated tipped-off x-ray tubes using GFEIHTs. No degradation in the anode current is observed under the operating conditions of 16.6 kV anode voltage and 160 μA anode current. The current dispersion, defined as the standard deviation (σ)mean over 24 h, is 2.8. The authors successfully demonstrated radiography and x-ray fluorescence spectrometry using an x-ray tube with GFEIHT. © 2013 American Vacuum Society. Source


Jyouzuka A.,Onizuka Glass Corporation | Jyouzuka A.,University of Shizuoka | Koike T.,Onizuka Glass Corporation | Nakamura T.,Onizuka Glass Corporation | And 2 more authors.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2011

We report a low-power-loss and high voltage X-ray tubes with a graphite nanospines (GNS) cold cathode. The cathode is encapsulated in a glass tube having a Beryllium window with a Tantalum film to generate X-rays. The internal tube pressure was below 10-7 Pa and a tube current exceeding 1 mA at a tube voltage of 22.9 kV was observed in the fabricated X-ray tube. The tube current dispersion, defined as standard deviation/mean (σ/mean), was relatively small at 2.4%. An X-ray radiation dose rate exceeding 5 Sv/h was obtained from the X-ray tube and the radiation dose rate dispersion was also small (σ/mean=0.3%). As an application of the X-ray tube, we demonstrated radiography for the rapid inspection of organic products. © 2011 Elsevier B.V. All rights reserved. Source


Koike T.,Onizuka Glass Corporation | Jyouzuka A.,Onizuka Glass Corporation | Jyouzuka A.,University of Shizuoka | Nakamura T.,Onizuka Glass Corporation | And 3 more authors.
Proceedings - IVNC 2011: 2011 24th International Vacuum Nanoelectronics Conference | Year: 2011

We report a new carbon material with nanostructures, known as inflamed graphite at high temperature (IGHT). IGHT is fabricated by inflaming material in a mixture of hydrogen and oxygen gas at a temperature exceeding 2000 °C. Fabricated IGHTs are encapsulated in a glass chamber in order to estimate the field emission current. The chamber pressure is as high as 10-7 Pa. A field emission current exceeding 350 μA is obtained from IGHT. An IGHT emits a stable current with a low current dispersion below the standard deviation/mean (σ/mean) of 2%.σ/mean reveals that the IGHT withstands ion bombardment. Source

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