900 resources related to Radiation Detector
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The conference program will consist of plenary lectures, symposia, workshops and invitedsessions of the latest significant findings and developments in all the major fields of biomedical engineering.Submitted full papers will be peer reviewed. Accepted high quality papers will be presented in oral and poster sessions,will appear in the Conference Proceedings and will be indexed in PubMed/MEDLINE.
ICC 2021 - IEEE International Conference on Communications
IEEE ICC is one of the two flagship IEEE conferences in the field of communications; Montreal is to host this conference in 2021. Each annual IEEE ICC conference typically attracts approximately 1,500-2,000 attendees, and will present over 1,000 research works over its duration. As well as being an opportunity to share pioneering research ideas and developments, the conference is also an excellent networking and publicity event, giving the opportunity for businesses and clients to link together, and presenting the scope for companies to publicize themselves and their products among the leaders of communications industries from all over the world.
The Conference focuses on all aspects of instrumentation and measurement science andtechnology research development and applications. The list of program topics includes but isnot limited to: Measurement Science & Education, Measurement Systems, Measurement DataAcquisition, Measurements of Physical Quantities, and Measurement Applications.
All areas of ionizing radiation detection - detectors, signal processing, analysis of results, PET development, PET results, medical imaging using ionizing radiation
The ICASSP meeting is the world's largest and most comprehensive technical conference focused on signal processing and its applications. The conference will feature world-class speakers, tutorials, exhibits, and over 50 lecture and poster sessions.
The IEEE Aerospace and Electronic Systems Magazine publishes articles concerned with the various aspects of systems for space, air, ocean, or ground environments.
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
Part I will now contain regular papers focusing on all matters related to fundamental theory, applications, analog and digital signal processing. Part II will report on the latest significant results across all of these topic areas.
Covers topics in the scope of IEEE Transactions on Communications but in the form of very brief publication (maximum of 6column lengths, including all diagrams and tables.)
IEEE Communications Magazine was the number three most-cited journal in telecommunications and the number eighteen cited journal in electrical and electronics engineering in 2004, according to the annual Journal Citation Report (2004 edition) published by the Institute for Scientific Information. Read more at http://www.ieee.org/products/citations.html. This magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications ...
2014 International Conference on Computer and Communication Engineering, 2014
This paper discusses on the performance of S OI pin diode radiation detector when compared to conventional bulk silicon pin diode radiation detector. Lateral S OI detector was virtually fabricated in SILVAC O ATHENA and its electrical characteristics was analyzed in SILVAC O ATLAS. It was found that S OI pin diode produced lower leakage current value with 1,10° A/μm2difference ...
Proceedings IEEE SoutheastCon 2002 (Cat. No.02CH37283), 2002
Semiconductor sensors cover a wide range of the electromagnetic spectrum for detecting nuclear-particle radiation. The most important properties of these detectors are their sensitivity i.e. their ability to low level radiation, charge transport, efficiency (electron-hole pair creation), and their response time. This article addresses the sensitivity of these devices. The following methods can increase the sensitivity of any electronic sensors: ...
IEEE Transactions on Nuclear Science, 2006
This work presents the performance of a radiation detector based on LEC semi- insulating GaAs with Au/Zn Schottky contact at variable temperature. The roles of the shaping time of a linear amplifier and operating voltage were studied. The performance of the radiation detector was calculated from pulse height spectra of 59.5 keV (/sup 241/Am) and 122.1 keV (/sup 57/Co). The ...
Proceedings Eleventh Annual IEEE International ASIC Conference (Cat. No.98TH8372), 1998
A new CMOS low-power mixed A/D ASIC for radiation detector readout front ends is presented. First, we recall the principle of radiation detection system before describing the whole architecture of the circuit. The discussion is then focused on the low-power issue. By means of an innovative 128:1 analog multiplexer, we show how we drastically reduced the mean power consumption without ...
IEEE Transactions on Nuclear Science, 2010
A pulsed bias voltage shutdown circuit to suppress the polarization effect in a CdTe radiation detector equipped with a matrix readout system was investigated. The matrix readout system is suitable for radiation detection systems that have many pixels and that are used at a relatively low counting rate, such as single photon emission computed tomography (SPECT). CdTe detectors have a ...
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This paper discusses on the performance of S OI pin diode radiation detector when compared to conventional bulk silicon pin diode radiation detector. Lateral S OI detector was virtually fabricated in SILVAC O ATHENA and its electrical characteristics was analyzed in SILVAC O ATLAS. It was found that S OI pin diode produced lower leakage current value with 1,10° A/μm2difference compared to bulk structure. However, the same S OI structure suffered from temperature variation with an increment of 1,102 A/μm2in current density after the temperature was varied from 27 °C to 80 °C.
Semiconductor sensors cover a wide range of the electromagnetic spectrum for detecting nuclear-particle radiation. The most important properties of these detectors are their sensitivity i.e. their ability to low level radiation, charge transport, efficiency (electron-hole pair creation), and their response time. This article addresses the sensitivity of these devices. The following methods can increase the sensitivity of any electronic sensors: 1. Proper selection of the material with respect to the desired radiation detection, i.e matching the energy gap of the device, E/sub g/, to the energy of incoming radiation. 2. Application of proper process technology, such as CMOS, BiCMOS, etc. 3. Fabrication technology i.e. using proper doping, substrate, etc. 4. Finally the design of the external circuitry. This paper reports the investigation of the circuitry of a newly developed CMOS a particle radiation detector and characterization of its sensitivity. We also discuss the the effect of external power supply connection on the sensitivity, the derivation of the analytical expression for the sensitivity and we compare the theoretical prediction with the experimental values. In addition, the effect of radiation on the threshold voltage is discussed as well as an increase in sensitivity due to radiation. Finally, a method is suggested to obtain an optimum performance.
This work presents the performance of a radiation detector based on LEC semi- insulating GaAs with Au/Zn Schottky contact at variable temperature. The roles of the shaping time of a linear amplifier and operating voltage were studied. The performance of the radiation detector was calculated from pulse height spectra of 59.5 keV (/sup 241/Am) and 122.1 keV (/sup 57/Co). The optimal reverse bias voltage of the radiation detector, shaping time of the linear amplifier and temperature of detector were investigated. The best charge collection efficiency of 98.2% at 303 K, relative energy resolution in FWHM 19.8% for 59.5 keV and 10.7% for 122.1 keV at 253 K were obtained.
A new CMOS low-power mixed A/D ASIC for radiation detector readout front ends is presented. First, we recall the principle of radiation detection system before describing the whole architecture of the circuit. The discussion is then focused on the low-power issue. By means of an innovative 128:1 analog multiplexer, we show how we drastically reduced the mean power consumption without sacrificing constraining specifications such as the input range and the readout rate. Testing mixed A/D, but strongly analog IC is also a big issue which is addressed here. Specific built-in test analog sub-circuits have been implemented in the ASIC, along with a JTAG module used to choose the type of test to perform. This module is also used to control and tune the biasing currents of the circuit. Finally, test results are presented and show that all the specifications are satisfied.
A pulsed bias voltage shutdown circuit to suppress the polarization effect in a CdTe radiation detector equipped with a matrix readout system was investigated. The matrix readout system is suitable for radiation detection systems that have many pixels and that are used at a relatively low counting rate, such as single photon emission computed tomography (SPECT). CdTe detectors have a time-dependent polarization effect that must be suppressed. One method to suppress this effect is pulsed bias voltage shutdown. However, on the bias voltage supply side of the matrix readout system, the speed of the voltage change depends on a time constant consisting of a bias resistor and a coupling capacitor. Therefore, the voltage cannot be changed within the time constant for the matrix readout system. To overcome this limitation, three circuits have been added: a clamp circuit to the noise filter resistor of the bias voltage supply, a clamp circuit to the bias resistor, and protection circuits at the charge amplifier inputs. These circuits make it possible to change the bias voltage faster than the time constant of the bias resistor and the coupling capacitor. Although a noise signal is observed after the bias voltage has recovered, the noise decays below 20 keV about 30 ms after the bias voltage recovery. Our results demonstrated that the proposed pulsed bias voltage shutdown method is very efficient to suppress the polarization effect within 100 ms for the CdTe detector with the matrix readout system.
The Alpha Magnetic Spectrometer (AMS) is a high energy physics experiment to be installed on the International Space Station (ISS) to measure the primary cosmic ray spectrum in space. A Transition Radiation Detector (TRD) will provide a proton rejection factor of 10<sup>2</sup> - 10<sup>3</sup> at 90% electron efficiency to search for SUSY dark matter neutralino annihilations in cosmic rays in the energy range from 10 GeV to 300 GeV. The TRD consists of 20 layers of straw proportional tubes interleaved with a fleece radiator; the tubes will be filled with a Xe:CO<sub>2</sub> (80:20) mixture at ~1.2 bar to detect the transition photons. To satisfy all the requirements for the expected detector performances, it is necessary to perform careful checks of the gas parameters and the gas gain. Several tests showed that the detector can fulfill all the stringent requirements for operation on the ISS, assuring the required rejection factor in the energy range of interest.
We have developed a novel approach that allows for fast estimation of margins of extracted lesions. Dual modality planar optical/PET scanner consists of a pair of detector heads, suitable for imaging positron-emitting radioisotopes, a mechanical fixture to maintain constant separation between the two cameras, an optical camera that provides an anatomical map, a sliding table with an attached sample holder and a common mobile gantry that supports all of the system components. The two identical detector heads are based on a 4×4 array of Hamamatsu R5900-C-8 position-sensitive photomultiplier tubes (PSPMTs) with 4 strip anodes in each orthogonal dimension. Each tube has an active region of ∼1 inch square. The PSPMT array is coupled to a matrix of LGSO scintillating crystals; with each crystal measuring 3×3×10 mm. The active area of the PET subsystem is 10 cm square. Anode readout strips are interconnected to provide 8 read-out lines for each dimension of the detector head. Detector heads are read out by a custom-built 16-channel FPGA-based ADC. Online laminography reconstruction is performed over five parallel planes, separated by a selectable distance, and images from each plane can be directly exported into an ImageJ software package for overlay and further analysis. System calibration process is described. Results of imaging of several tissue simulating materials are presented. The ability of the proposed dual-modality scanner to detect lesions in warm background has been demonstrated. Although the proposed system will not eliminate the need for pathology analysis, it will help to reduce time in surgery by unveiling insufficient margins in the sample tissue. The system will be soon demonstrated and tested in a realistic clinical environment.
A readout system has been designed and built to match the particular requirements of straw detectors used for particle tracking and particle identification by use of the transition radiation technique. A bipolar analogue integrated circuit with very high rate capability and two thresholds to separate track signals from transition radiation photon signals forms the front end of a complete readout system which is briefly described. The front end circuit passes discriminated digital data to the rest of the system via a novel three level logic scheme. The design of the circuit and expected performance are presented and compared with results from an earlier prototype.<<ETX>>
In this paper, a system is proposed for a Nuclear facility which is comprised of multiple detectors, controlled from a single receiver end with DHCP Address Reservation Network protocol. The radiation sensor is based on Geiger Muller tube (GMT) which is a reliable detector for the radioactive particulates in the gaseous effluent vented from nuclear facilities. The detectors are interconnected and controlled from a server by a remote operator. A real-time log can be generated from respective data sent by these multiple detectors. The detectors are also implemented such a way that it is able to interact with the operator through a graphical user interface. The generated data have been further used to plot a real-time graph with MATLAB which is integrated into the system. The system is tested under several radioactive sources considering the background radiation. The graphical interpretation of the radiation pattern in terms of count per minutes versus time was obtained from the received data. This proposed system allows the remote operator to record and store the data of different radiation levels emitted from the radioactive in different time which may be used to create a radiation emission curve of a whole year. The system may be used to detect any abnormal radiation level which may be harmful to the environment and associated with the warning system for the early detection during those adverse situations.
Radiation detectors need a high-voltage power supply for operation. This paper describes the possibilities of utilizing piezoelectric transformer for this purpose. Piezoelectric transformers allow achieve a high step-up voltage ratio. In comparison with electromagnetic transformer, the piezoelectric transformers have many advantages. In this article a Geiger-Müller tube supplying by a piezoelectric transformer is describe. The possibilities of output voltage regulation are also mentioned.
This standard applies to wide-bandgap semiconductor radiation detectors, such as cadmium telluride (CdTe), cadmium-zinc-telluride (CdZnTe, referred to herein as CZT), and mercuric iodide (HgI2) used in the detection and measurement of ionizing radiation at room temperature; gamma rays, X-rays, and charged particles are covered. The measurement procedures described herein apply primarily to detector elements having planar, hemispherical, or other geometries ...
Postdoctoral Researcher - Micro and Nano Technology
Lawrence Livermore National Laboratory
Neutrino Physics nEXO - Postdoctoral Researcher
Lawrence Livermore National Laboratory
Semiconductor Detector Engineers
Lawrence Livermore National Laboratory