Effect of Commercial Off-The-Shelf MAPS on γ-Ray Ionizing Radiation Response to Different Integration Times and Gains

Shoulong Xu, Jaap Velthuis, Qifan Wu, Yongchao Han, Kuicheng Lin, Lana Beck, Shuliang Zou, Yantao Qu, Zengyan Li

Research output: Contribution to journalArticle (Academic Journal)

1 Citation (Scopus)
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Abstract

We report the γ-ray ionizing radiation response of commercial off-the-shelf (COTS) monolithic active-pixel sensors (MAPS) with different integration times and gains. The distribution of the eight-bit two-dimensional matrix of MAPS output frame images was studied for different parameter settings and dose rates. We present the first results of the effects of these parameters on the response of the sensor and establish a linear relationship between the average response signal and radiation dose rate in the high-dose rate range. The results show that the distribution curves can be separated into three ranges. The first range is from 0 to 24, which generates the first significant low signal peak. The second range is from 25 to 250, which shows a smooth gradient change with different integration times, gains, and dose rates. The third range is from 251 to 255, where a final peak appears, which has a relationship with integral time, gain, and dose rate. The mean pixel value shows a linear dependence on the radiation dose rate, albeit with different calibration constants depending on the integration time and gain. Hence, MAPS can be used as a radiation monitoring device with good precision.
Original languageEnglish
Article number4950
Number of pages10
JournalSensors
Volume19
Issue number22
DOIs
Publication statusPublished - 13 Nov 2019

Keywords

  • COTS commercial MAPS
  • radiation response
  • integral time
  • gain

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