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Open AccessArticle

Video Monitoring Application of CMOS 4T-PPD-APS Under γ-ray Radiation

School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
Department of Engineering Physics, Tsinghua University, Beijing 100084, China
China Institute of Atomic Energy, Beijing 102413, China
Beijing Institute of Control Engineering, Beijing 100084, China
Author to whom correspondence should be addressed.
Sensors 2019, 19(2), 359;
Received: 25 December 2018 / Revised: 10 January 2019 / Accepted: 16 January 2019 / Published: 17 January 2019
(This article belongs to the Special Issue Semiconductor and CMOS-Based Sensors for Environmental Monitoring)
In this paper, we discuss the potential use of four transistor active pixel sensor (4T-APS) as a video monitor at a nuclear accident site with a high level of γ radiation. The resistance and radiation responses to γ radiation were investigated by radiation experiments using 137Cs and 60Co γ-ray sources. The radiation resistance of 4T-APS was studied by testing the mean and the maximum dark current of the sensors after irradiation. A random spatial distribution of radiation response events was observed upon analyzing these events on the video images in a given time during irradiation. The background dependence of the 4T-APS was also studied by comparing the grayscale incremental value of the images with different color and grayscale backgrounds: the radiation response events were obvious on the images with a background having a smaller grayscale value or a deeper color. Finally, the color saturation and resolution of the images were tested using a vector oscilloscope and a test card. When the total ionizing dose was less than or equal to the damage threshold, no significant performance deterioration of 4T-APS was observed in an environment with sufficient light. View Full-Text
Keywords: ionizing radiation; radiation response; radiation interference; 4T-PPD-APS ionizing radiation; radiation response; radiation interference; 4T-PPD-APS
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Xu, S.; Zou, S.; Han, Y.; Qu, Y.; Zhang, T. Video Monitoring Application of CMOS 4T-PPD-APS Under γ-ray Radiation. Sensors 2019, 19, 359.

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