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Your search keyword '"Camarda, Giuseppe S."' showing total 98 results
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98 results on '"Camarda, Giuseppe S."'

10. Te inclusions in CZT detectors: new method for correcting their adverse effects

Author

Bolotnikov, Aleksey E., Babalola, Stephen, Camarda, Giuseppe S., Cui, Yonggang, Egarievwe, Stephen U., Hawrami, R., Hossain, Anwar, Yang, Ge, and James, Ralph B.

Subjects
Radiation warning systems -- Usage, Crystal detectors -- Usage, Business, Electronics, Electronics and electrical industries
Published
2010

11. Extended defects in CdZnTe radiation detectors

Author

Bolotnikov, Aleksey E., Babalola, Stephen O., Camarda, Giuseppe S., Chen, Henry, Awadalla, S., Cui, Yonggang, Egarievwe, Stephrn U., Fochuk, Petro M., Hawrami, Rastgo, Hossain, Anwar, James, Jesse R., Nakonechnyj, I.J., Mackenzie, J., Yang, Ge, Xu, Chao, and James, Ralph B.

Subjects
Detectors, Business, Electronics, Electronics and electrical industries
Published
2009

13. Polarization studies of CdZnTe detectors using synchrotron X-ray radiation

Author

Camarda, Giuseppe S., Bolotnikov, Aleksey E., Cui, Yonggang, Hossain, Anwar, Awadalla, Salah A., Mackenzie, J., Chen, Henry, and James, Ralph B.

Subjects
Polarization (Nuclear physics) -- Research, Radiation warning systems -- Properties, Radiation -- Research, X-rays -- Properties, Business, Electronics, Electronics and electrical industries
Abstract

High densities of impurities and defects lead to severe charge-carrier trapping that can be major issues in assuring the high performance of CZT detectors. For some medical-imaging applications, the typical X-ray flux can be very high. Under such high irradiation conditions, the trapped charge builds up inside the detector affecting its stability. This phenomenon generally is termed the polarization effect. We conducted detailed studies on polarization in CZT crystals employing a highly collimated synchrotron X-ray radiation source available at Brookhaven's National Synchrotron Light Source (NSLS). We were able to induce polarization effects by irradiating specific areas within the detector. These measurements allowed us to make, for the first time, a quantitative comparison between areas where polarization is induced, and the electron- and hole-collection X-ray maps obtained at low flux, where no polarization is induced. We discuss the results of these polarization studies. Index Terms--CdZnTE, X-ray Diffraction Topography (XDT), National Synchrotron Light Source (NSLS), polarization, WXDT, X27B.

Published
2008

14. Readout system for arrays of Frisch-ring CdZnTe detectors

Author

Cui, Yonggang, Bolotnikov, Aleksey E., Camarda, Giuseppe S., Carini, Gabriella A., De Geronimo, Gianluigi, O'Connor, Paul, James, Ralph B., Kargar, Alireza, Harrison, Mark Jason, and McGregor, Douglas S.

Subjects
Radiation warning systems -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

Frisch-ring CdZnTe detectors have demonstrated good energy resolution for identifying isotopes, Index Terms--CdZnTe, data acquisition system, Frisch-ring detector.

Published
2007

23. Sub-pixel resolution in pixelated CdZnTe gamma ray detectors with different pixel sizes (0.5 mm to 1.72 mm) using a focused laser beam (Conference Presentation)

Author

Ocampo Giraldo, Luis A., primary, Bolotnikov, Aleksey E., additional, Camarda, Giuseppe S., additional, De Geronimo, Gianluigi, additional, Gul, Rubi, additional, Fried, Jack, additional, Hossain, Anwar, additional, Unlu, Kenan, additional, Vernon, Emerson, additional, Yang, Ge, additional, and James, Ralph B., additional

Published
2017
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24. Achieving subpixel resolution with time-correlated transient signals in pixelated CdZnTe gamma-ray sensors using a focused laser beam (Conference Presentation)

Author

Ocampo Giraldo, Luis A., primary, Bolotnikov, Aleksey E., additional, Camarda, Giuseppe S., additional, Cui, Yonggang, additional, De Geronimo, Gianluigi, additional, Gul, Rubi, additional, Fried, Jack, additional, Hossain, Anwar, additional, Unlu, Kenan, additional, Vernon, Emerson, additional, Yang, Ge, additional, and James, Ralph B., additional

Published
2017
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28. Using the TOF method to measure the electron lifetime in long-drift CdZnTe detectors (Conference Presentation)

Author

Bolotnikov, Aleksey E., primary, Camarda, Giuseppe S., additional, Chen, Eric, additional, Cui, Yonggang, additional, Gul, Rubi, additional, Dedic, Václav, additional, De Geronimo, Gianluigi, additional, Fried, Jack, additional, Hossain, Anwar, additional, MacKenzie, Jason M., additional, Sellin, Paul, additional, Taherion, Saeid, additional, Vernon, Emerson, additional, Yang, Ge, additional, El-hanany, Uri, additional, and James, Ralph B., additional

Published
2016
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36. Design Considerations and Testing of Virtual Frisch-Grid CdZnTe Detector Arrays Using the H3D ASIC

Author

Bolotnikov, Aleksey E., primary, Butcher, Jamie, additional, Camarda, Giuseppe S., additional, Cui, Yonggang, additional, De Geronimo, Gianluigi, additional, Fried, Jack, additional, Fochuk, P. M., additional, Hossain, Anwar, additional, Kim, Kihyun H., additional, Kopach, O. V., additional, Mahler, G., additional, Marshall, Matthew, additional, McCall, B., additional, Petryk, Matthew, additional, Vernon, Emerson, additional, Yang, Ge., additional, and James, Ralph B., additional

Published
2013
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37. Study of the diffusion of Te inclusions in CdZnTe nuclear detectors in post-growth annealing

Author

Egarievwe, Stephen U., primary, Adams, Aaron L., additional, Drabo, Mebougna L., additional, Ashford, Marcus D., additional, Pinder, Rodney, additional, Jones, Dominique E., additional, Kassu, Aschalew, additional, Chan, Wing, additional, Yang, Ge, additional, Camarda, Giuseppe S., additional, Bolotnikov, Aleksey E., additional, and James, Ralph B., additional

Published
2012
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38. Study of surface passivation and contact deposition techniques in CdZnTe X-Ray and gamma-ray detectors

Author

Jones, Dominique E., primary, Egarievwe, Stephen U., additional, Hossain, Anwar, additional, Okwechime, Ifechukwude O., additional, Drabo, Mebougna L., additional, Hall, JaQueeta, additional, Adams, Aaron L., additional, Babalola, Stephen O., additional, Camarda, Giuseppe S., additional, Bolotnikov, Aleksey E., additional, Chan, Wing, additional, and James, Ralph B., additional

Published
2012
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39. Modeling an Interwoven Collimator for A 3D Endocavity Gamma Camera.

Author

Yonggang Cui, Camarda, Giuseppe S., Hossain, Anwar, Ge Yang, Roy, Utpal N., Lall, Terry, and James, Ralph B.

Subjects
*CANCER diagnosis, *POSITRON emission tomography, *COLLIMATORS
Abstract

Positron emission tomography (PET) and single-photon emission-computed tomography (SPECT) are important nuclear-medical imaging tools in diagnosing cancers and creating effective treatment plans. Commercially imaging systems are operated externally and can create 3D images of the whole body or of specific organs by rotating the gamma-ray detectors, and then employing software to reconstruct the 3D images from the multiple 2D projections at different angles of view. However, their uses in intraoperative environments or for imaging specific small organs, e.g., the prostate, ovary, and cervix, are limited because of their bulky designs and the long working-distance, hence causing low efficiency and poor spatial-resolution. In such situations, compact imaging devices, e.g., the trans-rectal gamma camera developed at Brookhaven National Laboratory (BNL) and Hybridyne Imaging Technologies, are preferable for detecting intra-prostatic tumors. The camera uses pixilated cadmium zinc telluride (CdZnTe) detectors with a matched parallel-hole collimator. However, their lack of 3D imaging capability limits their use in clinics, because the acquired images cannot be interpreted easily due to missing depth information. Given the constraint on space in such operations, the traditional 3D-image acquisition methods are impractical. For this reason, we designed an interwoven collimator dedicated for 3D imaging using an endocavity probe. This novel collimator allows us to take two or multiple views of a specific organ or tissue without rotating the camera. At the first stage of design for the collimator, we carried out Monte-Carlo simulations to study the response of the collimator and the attached detectors to gamma rays, and then developed a maximum-likelihood-based algorithm for reconstructing 3D images. In this paper, we detail our modeling of the collimator on a cluster Linux computer, and discuss the imaging capability of this novel collimator. [ABSTRACT FROM AUTHOR]

Published
2015
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48. Readout System for Arrays of Frisch-Ring CdZnTe Detectors.

Author

Yonggang Cui, Bolotnikov, Aleksey E., Camarda, Giuseppe S., Carini, Gabriella A., de Geronimo, Gianluigi, O'Connor, Paul, James, Ralph B., Kargar, Alireza, Harrison, Mark Jason, and McGregor, Douglas S.

Subjects
GAMMA ray detectors, CADMIUM, ZINC, TELLURIUM, RADIATION, DETECTORS
Abstract

Frisch-ring CdZnTe detectors have demonstrated good energy resolution for identifying isotopes, <1% FWHM at 662 keV, and good efficiency for detecting gamma rays. To facilitate the application of this detector in radiation detection, we are designing a portable device that can incorporate with an 8 × 8 Frisch-ring detector array. A prototype system has been designed, which includes detector modules, front-end electronics, signal processing circuit, USB interface and high-voltage power supply. This paper describes the design and assembly of the detector modules and the structure of the prototype system. Some test results are also reported. [ABSTRACT FROM AUTHOR]

Published
2007
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