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Author (up) Alcalde Bessia, F.; Flandre, D.; André, N.; Irazoqui, J.; Pérez, M.; Gómez Berisso, M.; Lipovetzky, J.
Title Ultra Low Power Ionizing Dose Sensor Based on Complementary Fully Depleted MOS Transistors for Radiotherapy Application Type Journal Article
Year 2019 Publication IEEE Transactions on Nuclear Science Abbreviated Journal IEEE Transactions on Nuclear Science
Volume Issue Pages 1-1
Keywords Transistors; Temperature measurement; Voltage measurement; Threshold voltage; Radiation effects; Current measurement; Semiconductor device measurement; Silicon radiation detectors; Ionizing radiation sensors; Silicon-on-insulator
Abstract 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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Call Number BT @ pedrazp @ Serial 841
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Author (up) Alcalde Bessia, F.; Pérez, M.; Gomez Berisso, M.; Piunno, N.; Mateos, H.; Pomiro, F.J.; Sidelnik, I.; Blostein, J.J.; Sofo Haro, M.; Lipovetzky, J.
Title X-ray micrographic imaging system based on COTS CMOS sensors Type Conference Article
Year 2017 Publication 2017 Argentine Conference of Micro-Nanoelectronics, Technology and Applications (CAMTA) Abbreviated Journal
Volume Issue Pages 1-4
Keywords biological techniques; biology computing; CMOS image sensors; image processing equipment; X-ray imaging; X-ray image acquisition; X-ray micrographic imaging system; Commercial Off The Shelf CMOS image sensors; biology; paleontology research; scintillator conversion layers; electronic components inspection; COTS CMOS sensors; electron volt energy 8.0 keV; Photonics; X-ray imaging; Silicon; Attenuation; Detectors; Image sensors; Cmos; Vlsi; X-ray applications; Biomedical imaging; CMOS image sensors
Abstract This paper presents the use of Commercial Off The Shelf CMOS image sensors for the acquisition of X-ray images with high spatial resolution. The X-ray images, with application in biology, electronic components inspection or paleontology research, are obtained with 8 keV photons from a Cu tube. The quantum efficiency of the detector is estimated using attenuation lengths of photons in the sensor, and compared to traditional scintillator conversion layers.
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Series Editor Series Title Abbreviated Series Title 2017 Argentine Conference of Micro-Nanoelectronics, Technology and Applications (CAMTA)
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Call Number BT @ pedrazp @ Serial 831
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Author (up) Galimberti, C.L.; Alcalde Bessia, F.; Perez, M.; Gómez Berisso, M.; Sofo Haro, M.; Sidelnik, I.; Blostein, J.J.; Asorey, H.; Lipovetzky, J.
Title A Low Cost Environmental Ionizing Radiation Detector Based on COTS CMOS Image Sensors Type Conference Article
Year 2018 Publication 2018 IEEE Biennial Congress of Argentina (ARGENCON) Abbreviated Journal
Volume Issue Pages 1-6
Keywords CMOS image sensors; particle detectors; radiation detection; low cost environmental ionizing radiation detector; COTS CMOS image sensors; geometrical characteristics; alpha particles; radiation sources; Raspberry Pi3 computer; Omnivision OV5647 commercial off the shelf image sensor; X-ray photon; gamma photons; OpenCV library; size 241.0 am; Detectors; Software; Image sensors; Alpha particles; Prototypes; Silicon; Image color analysis
Abstract We present the development of a system for the detection of ionizing radiation based on the Omnivision OV5647 Commercial Off The Shelf image sensor. The data is read and processed in real-time using a Raspberry Pi 3 computer. The amount of charge and geometrical characteristics of the cluster of pixels exited when a particle interacts with the sensor is recorded and used to identify the type of incoming particle, distinguishing between alpha particles and X-ray or gamma photons. The software was programmed in C using the OpenCV library. The system was tested with 137Cs and 241Am radiation sources.
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Series Editor Series Title Abbreviated Series Title 2018 IEEE Biennial Congress of Argentina (ARGENCON)
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Call Number BT @ pedrazp @ Serial 836
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Author (up) Lipovetzky, J.; Cicuttin, A.; Crespo, M.L.; Sofo Haro, M.; Alcalde Bessia, F.; Pérez, M.; Gómez Berisso, M.
Title Multi-spectral X-ray transmission imaging using a BSI CMOS Image Sensor Type Journal Article
Year 2020 Publication Radiation Physics and Chemistry Abbreviated Journal
Volume 167 Issue Pages 108244
Keywords CMOS image detectors; Ionizing radiation; X-rays; Imaging
Abstract In this work we study the performance to obtain X-ray images of a Back Side Illuminated CMOS Image Sensor, the Omnivision OV5647, empoying X-rays from tube with a palladium anode and voltages from 7.5 keV to 50 keV. The performance is compared with the Timepix detector operating in the Time Over Threshold mode. False color images are obtained using data from different energies and brightnesses, to fussion different information on the same picture. The different attenuations are analyzed and discussed in terms of the charge detection efficiency of the CMOS sensor, measured using Fluorescence X-rays and gamma rays from calibrated sources.
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ISSN 0969-806x ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 838
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Author (up) Mateos, H.; Lipovetzky, J.; Alcalde Bessia, F.; Perez, M.; Cappagli, P.; Gomez Berisso, M.
Title Characterization of sensors and design of an embedded photodetectors array for beam profile measurements in radiotherapy Type Conference Article
Year 2017 Publication 2017 Eight Argentine Symposium and Conference on Embedded Systems (CASE) Abbreviated Journal
Volume Issue Pages 1-6
Keywords 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.
Abstract 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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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title 2017 Eight Argentine Symposium and Conference on Embedded Systems (CASE)
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Notes Approved no
Call Number BT @ pedrazp @ Serial 832
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Author (up) Pérez, M.; Blostein, J.J.; Bessia, F.A.; Tartaglione, A.; Sidelnik, I.; Haro, M.S.; Suárez, S.; Gimenez, M.L.; Berisso, M.G.; Lipovetzky, J.
Title Thermal neutron detector based on COTS CMOS imagers and a conversion layer containing Gadolinium Type Journal Article
Year 2018 Publication Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Abbreviated Journal
Volume 893 Issue Pages 157-163
Keywords CMOS sensors; Position sensitive neutron detectors; Gadolinium conversion layer; Neutron detection technique
Abstract In this work we will introduce a novel low cost position sensitive thermal neutron detection technique, based on a Commercial Off The Shelf CMOS image sensor covered with a Gadolinium containing conversion layer. The feasibility of the neutron detection technique implemented in this work has been experimentally demonstrated. A thermal neutron detection efficiency of 11.3% has been experimentally obtained with a conversion layer of 11.6 μm. It was experimentally verified that the thermal neutron detection efficiency of this technique is independent on the intensity of the incident thermal neutron flux, which was confirmed for conversion layers of different thicknesses. Based on the experimental results, a spatial resolution better than 25 μm is expected. This spatial resolution makes the proposed technique specially useful for neutron beam characterization, neutron beam dosimetry, high resolution neutron imaging, and several neutron scattering techniques.
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ISSN 0168-9002 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 834
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Author (up) Perez, M.; F. Alcalde; M. S. Haro; Sidelnik, I.; Blostein, J.J.; Gomez Berisso, M.; Lipovetzky, J.
Title Implementation of an ionizing radiation detector based on a FPGA-controlled COTS CMOS image sensor Type Conference Article
Year 2017 Publication 2017 XVII Workshop on Information Processing and Control (RPIC) Abbreviated Journal
Volume Issue Pages 1-6
Keywords alpha-particle detection; beta-ray detection; CMOS image sensors; field programmable gate arrays; gamma-ray detection; ionisation chambers; gamma photon irradiation; FPGA-controlled COTS CMOS image sensor; mixed radiation field; alpha particle irradiation; shelf CMOS image sensor; ionizing radiation detector; Detectors; Field programmable gate arrays; Active pixel sensors; Biomedical imaging; Semiconductor device modeling; Random access memory; Ionizing radiation; Radiation detectors; Fpga; COTS CMOS sensors
Abstract This work presents the development and implementation of an ionizing radiation detector based on a commercial off the shelf CMOS image sensor and a FPGA. The response of the system was tested in irradiations with gamma photons, beta and alpha particles using different configurations of the image sensor. Finally, we analyze the possible uses of such configurations in the discrimination of events produced by alpha particles in mixed radiation fields.
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title 2017 XVII Workshop on Information Processing and Control (RPIC)
Series Volume Series Issue Edition
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Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 833
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Author (up) Perez, M.; Lipovetzky, J.; Sofo Haro, M.; Sidelnik, I.; Blostein, J.J.; Alcalde Bessia, F.; Gomez Berisso, M.
Title Particle detection and classification using commercial off the shelf CMOS image sensors Type Journal Article
Year 2016 Publication Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Abbreviated Journal Nucl. Instr. Meth. Phys. Res. A
Volume 827 Issue Pages 171-180
Keywords Radiation detectors; CMOS image sensors; Alpha Particles; Beta rays; Gamma rays; X-rays; Dosimetry
Abstract Abstract

In this paper we analyse the response of two different Commercial Off The shelf CMOS image sensors as particle detectors. Sensors were irradiated using X-ray photons, gamma photons, beta particles and alpha particles from diverse sources. The amount of charge produced by different particles, and the size of the spot registered on the sensor are compared, and analysed by an algorithm to classify them. For a known incident energy spectrum, the employed sensors provide a dose resolution lower than microGray, showing their potentials in radioprotection, area monitoring, or medical applications.
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0168-9002 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 741
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