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3 August 2021 Organic radiation detectors for real-time dosimetry
Zachary A. Lamport, Marco R. Cavallari, Michael J. Bardash, Ioannis Kymissis
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Proceedings Volume 11810, Organic and Hybrid Sensors and Bioelectronics XIV; 118100H (2021) https://doi.org/10.1117/12.2597183
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States
Abstract
Here, we report on an all-organic solid-state radiation dosimeter patterned onto a plastic substrate that allows for real-time measurements communicated over WiFi. The “sense” area and the conductive traces are made using low-conductivity PEDOT:PSS, and measurements are read out by a low-current op-amp. As the detector is subjected to radiation, the ionized air, substrate, and sense area cause a charge accumulation which is then read out as a voltage from the op-amp. OFETs on either side of the sense area allow for the charge to be cleared, allowing for accurate dose measurement without saturation. Additionally, the inclusion of a PEDOT:PSS ground plane as the first layer on the PEN substrate helps to shield the sensor itself from extraneous static. For X-rays, the limit of detection is approximately 5 mRad/min, and for gamma rays the limit is approximately 5 mRad/hr. Through appropriate control of the clearing OFETs, the device is quickly reset to allow for a continuous measurement.
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Zachary A. Lamport, Marco R. Cavallari, Michael J. Bardash, and Ioannis Kymissis "Organic radiation detectors for real-time dosimetry", Proc. SPIE 11810, Organic and Hybrid Sensors and Bioelectronics XIV, 118100H (3 August 2021); https://doi.org/10.1117/12.2597183
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KEYWORDS
Sensors
Radiation dosimetry
Field effect transistors
Control systems
Environmental sensing
Gamma radiation
Ionizing radiation
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