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Open AccessArticle

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

1
School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
2
Department of Engineering Physics, Tsinghua University, Beijing 100084, China
3
China Institute of Atomic Energy, Beijing 102413, China
4
Beijing Institute of Control Engineering, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(2), 359; https://doi.org/10.3390/s19020359
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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MDPI and ACS Style

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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