Compact x-ray tube based on carbon nanotube cold cathode emitter for handheld type x-ray application

Jongmin Lim; Amar Prasad Gupta; Jaeik Jung; Jaekyu Jang; Jinho Choi; Shalini Rajpoot; Seung Jun Yeo; Jeung Sun Ahn; Jehwang Ryu

doi:10.1117/12.2613310

4 April 2022 Compact x-ray tube based on carbon nanotube cold cathode emitter for handheld type x-ray application

Jongmin Lim, Amar Prasad Gupta, Jaeik Jung, Jaekyu Jang, Jinho Choi, Shalini Rajpoot, Seung Jun Yeo, Jeung Sun Ahn, Jehwang Ryu

Author Affiliations +

Proceedings Volume 12031, Medical Imaging 2022: Physics of Medical Imaging; 120314H (2022) https://doi.org/10.1117/12.2613310
Event: SPIE Medical Imaging, 2022, San Diego, California, United States

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Abstract

A Carbon nanotube (CNT) cold cathode emitter-based compact X-ray tube for X-ray application is studied in this paper. In the electron gun, the conventional filament was replaced by CNT emitter; CNTs were grown on metal alloy substrate. Using this electron gun, electron emission can be controlled by applying voltage rather than heating. Up to 2 mA tube current can be generated by this CNT electron gun. Also, the pulsed tube current and pulsed radiation dose can be generated by using MOSFET circuit. We measured the radiation dose generated in 30 frames per second, and confirmed that the waveform was generated as a square wave. From that waveform, it was confirmed that unnecessary radiation exposure can be minimized. The body of the X-ray tube is made of ceramic, which has strong durability against impact and high temperature. The ceramic used for the tube has an insulation distance of 30 mm and shows stable insulation performance in an environment where a voltage of 70 kV is applied. Using this X-ray tube, we successfully obtained X-ray images of various objects with acceleration voltages between 45 kV and 70 kV.

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Jongmin Lim, Amar Prasad Gupta, Jaeik Jung, Jaekyu Jang, Jinho Choi, Shalini Rajpoot, Seung Jun Yeo, Jeung Sun Ahn, and Jehwang Ryu "Compact x-ray tube based on carbon nanotube cold cathode emitter for handheld type x-ray application", Proc. SPIE 12031, Medical Imaging 2022: Physics of Medical Imaging, 120314H (4 April 2022); https://doi.org/10.1117/12.2613310

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