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Alcalde Bessia, F.; Flandre, D.; André, N.; Irazoqui, J.; Pérez, M.; Gómez Berisso, M.; Lipovetzky, J. |
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Ultra Low Power Ionizing Dose Sensor Based on Complementary Fully Depleted MOS Transistors for Radiotherapy Application |
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Journal Article |
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2019 |
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IEEE Transactions on Nuclear Science |
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IEEE Transactions on Nuclear Science |
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1-1 |
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Transistors; Temperature measurement; Voltage measurement; Threshold voltage; Radiation effects; Current measurement; Semiconductor device measurement; Silicon radiation detectors; Ionizing radiation sensors; Silicon-on-insulator |
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We evaluate the use of the thick buried oxide (BOX) of Fully Depleted Silicon-on-Insulator (FD-SOI) transistors for Total Ionizing Dose (TID) measurements in a radiotherapy application. The devices were fabricated with a custom process in UniversitC) Catholique de Louvain (UCL) which allows to make accumulation mode PMOS transistors and inversion mode NMOS transistors. We characterized the temperature behavior of these devices and the response under X-ray radiation produced by an Elekta radiotherapy linear accelerator, and compared the obtained dose sensitivity to other published works. Taking advantage of these devices, an ultra low power MOS ionizing dose sensor, or MOS dosimeter, with inherent temperature compensation is presented. This dosimeter achieved a sensitivity of 154 mV/Gy with a temperature error factor of 13 mGy/°C and a current consumption below 1 nA. |
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BT @ pedrazp @ |
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841 |
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Author |
Mateos, H.; Lipovetzky, J.; Alcalde Bessia, F.; Perez, M.; Cappagli, P.; Gomez Berisso, M. |
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Title |
Characterization of sensors and design of an embedded photodetectors array for beam profile measurements in radiotherapy |
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Conference Article |
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2017 |
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2017 Eight Argentine Symposium and Conference on Embedded Systems (CASE) |
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1-6 |
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biomedical measurement; dosimeters; dosimetry; photodetectors; photodiodes; radiation therapy; photodetectors array; sensor characterization; Commercial Of The Shelf photodiodes; 1D dosimeter array; dose spatial distribution; radiotherapy irradiation field; teletherapy source; gamma rays; beam profile measurements; dose resolution; acquisition electronics; radiation absorbed dose 0.06 cGy; Photodiodes; Sensitivity; Current measurement; Detectors; Radiation effects; Voltage measurement; Multiplexing; Radiotherapy; Ionizing Radiation; Photodiodes; Quality Assurance. |
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In this work, the dosimetric performance of several Commercial Of The Shelf photodiodes was studied. They were tested against gamma rays from a teletherapy source and were characterized with the aim of building a one-dimensional array of dosimeters able to measure the the spatial distribution of dose in a radiotherapy irradiation field. An embedded system comprising an array of 40 photodiodes and its acquisition electronics was built and tested. The dose resolution of each detector was 0.06 cGy and the spatial resolution of the system 0.5 cm. |
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2017 Eight Argentine Symposium and Conference on Embedded Systems (CASE) |
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BT @ pedrazp @ |
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832 |
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