Dr. Leonard J. Cirignano Profile

Dr. Leonard J. Cirignano

Scientist at Radiation Monitoring Devices Inc

SPIE Involvement:

Author

Publications (31)

Proceedings Article | 4 October 2024 Presentation

Presentation

Performance characterization of 5x5x12 mm3 virtual Frisch-Grid TlBr detectors

Aleksey Bolotnikov, Conner Brown, Gabriella Carini, James Christian, Leonard Cirignano, Connie-Rose Deane, Alfred Dellapenna, Jack Fried, Sven Herrmann, Alireza Kargar, Hadong Kim, Michael Koslowsky, Piotr Maj, Vamshi Manthena, Alexander Miller, Sandeep Miryala, Andrea Norris, Yaroslav Ogorodnik, Giovanni Pinaroli, Eric Raguzin, Martin Smith, Mike Squillante, Joshua Tower, Andrew Valente, Evan Weststrate, Kanai Shah

Proceedings Volume PC13151, PC131510D (2024) https://doi.org/10.1117/12.3029913

KEYWORDS: Sensors, Weapons of mass destruction, Homeland security, System identification, Polarization, Platinum, Ions, Electric field sensors, Detector arrays, Defect detection

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Proceedings Article | 4 October 2022 Presentation + Paper

Presentation + Paper

Improved performance and longevity of large volume thallium bromide devices

H. Kim, L. Cirignano, J. F. Christian, A. Kargar, Y. Ogorodnik, S. Kim, M. Breen, M. R. Squillante, K. Shah

Proceedings Volume 12241, 1224106 (2022) https://doi.org/10.1117/12.2635925

KEYWORDS: Sensors, Cesium, Thallium, Semiconductors, Gamma radiation, Spectroscopy, Signal detection, Sensor performance, Amplifiers, Signal generators

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Proceedings Article | 3 October 2022 Presentation

Presentation

Performance characterizations of position-sensitive virtual Frisch-grid TlBr detectors (Conference Presentation)

Aleksey Bolotnikov, Conner Brown, Gabriella Carini, James Christian, Leonard Cirignano, Connie-Rose Deane, Alfred Dellapenna, Grzegorz Deptuch, Jack Fried, Sven Herrmann, Hadong Kim, Giovanni Pinaroli, Alireza Kargar, Martin Koslowsky, Piotr Maj, Victor Manthena, Alexander Miller, Sandeep Miriala, Eric Raguzina, Kanai Shah, Michael Squillante, Martin Smith, Andrew Valente, Evan Weststrate

Proceedings Volume PC12241, PC122410D (2022) https://doi.org/10.1117/12.2635899

KEYWORDS: Sensors, Crystals, Semiconductors, Semiconductor materials, Ions, Gamma radiation, Electric field sensors

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Proceedings Article | 9 September 2019 Presentation

Presentation

Cathode waveform analysis of TlBr semiconductor detectors (Conference Presentation)

Stephen Payne, Erik Swanberg, Sean O'Neal, Paul Bennett, Leonard Cirignano, Kanai Shah, Zhong He

Proceedings Volume 11114, 111140M (2019) https://doi.org/10.1117/12.2530334

KEYWORDS: Semiconductors, Sensors, Electrodes, Gamma radiation, Electron transport, Crystals

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Proceedings Article | 13 September 2018 Presentation + Paper

Presentation + Paper

CVD diamond for beta particle detection in a gamma-ray background

Paul Bennett, Alireza Kargar, Leonard Cirignano, Hadong Kim, Kanai Shah

Proceedings Volume 10762, 107620Z (2018) https://doi.org/10.1117/12.2323695

KEYWORDS: Sensors, Diamond, Particles, Krypton, Gamma radiation, Cesium, Crystals, Strontium, Temperature metrology, Electronics

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Proceedings Article | 2 November 2016 Presentation

Presentation

Strategy on eliminating oxygen impurity for crystal growth of Tl6SeI4 room-temperature hard radiation detector (Conference Presentation)

Wenwen Lin, Zhifu Liu, Alexei Churilov, Yihui He, Hadong Kim, Leonard Cirignano, Christos Malliakas, Hao Li, Constantinos Stoumpos, Duck Young Chung, Bruce Wessels, Mercouri Kanatzidis

Proceedings Volume 9968, 99681A (2016) https://doi.org/10.1117/12.2237941

KEYWORDS: Oxidation, Thallium, Oxygen, Crystals, Sensors, Sensor performance, Chalcogenides, Semiconductors, Oxides, Binary data

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Proceedings Article | 30 September 2016 Presentation + Paper

Presentation + Paper

Semiconductor neutron detectors

Andrey Gueorguiev, Huicong Hong, Joshua Tower, Hadong Kim, Leonard Cirignano, Arnold Burger, Kanai Shah

Proceedings Volume 9968, 99680P (2016) https://doi.org/10.1117/12.2237054

KEYWORDS: Sensors, Semiconductors, Signal detection, Crystals, Lithium, Semiconducting wafers, Absorption, Gamma radiation, Indium, Particles

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Proceedings Article | 27 August 2015 Paper

Paper

Auger compositional depth profiling of the metal contact-TlBr interface

A. Nelson, E. Swanberg, L. Voss, R. Graff, A. Conway, R. Nikolic, S. Payne, H. Kim, L. Cirignano, K. Shah

Proceedings Volume 9595, 959507 (2015) https://doi.org/10.1117/12.2186653

KEYWORDS: Thallium, Metals, Profiling, Platinum, Molybdenum, Interfaces, Sensors, Surface finishing, Scanning electron microscopy, Bromine

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Proceedings Article | 5 September 2014 Paper

Paper

Oxidation/reduction reactions at the metal contact-TlBr interface: an x-ray photoelectron spectroscopy study

A. Nelson, E. Swanberg, L. Voss, R. Graff, A. Conway, R. Nikolic, S. Payne, H. Kim, L. Cirignano, K. Shah

Proceedings Volume 9213, 921313 (2014) https://doi.org/10.1117/12.2062037

KEYWORDS: Platinum, Molybdenum, Thallium, Chlorine, Metals, Sensors, Bromine, Photoemission spectroscopy, Surface finishing, X-rays

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Proceedings Article | 4 September 2014 Paper

Paper

The effect of guard ring on leakage current and spectroscopic performance of TlBr planar detectors

Alireza Kargar, Hadong Kim, Leonard Cirignano, Kanai Shah

Proceedings Volume 9215, 92150E (2014) https://doi.org/10.1117/12.2065908

KEYWORDS: Sensors, Electrodes, Spectroscopes, Gamma radiation, Thallium, Ceramics, Crystals, Amplifiers, Pulse generators, Active remote sensing

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Proceedings Article | 26 September 2013 Paper

Paper

Boron selenide semiconductor detectors for thermal neutron counting

Alireza Kargar, Joshua Tower, Leonard Cirignano, Kanai Shah

Proceedings Volume 8852, 88521M (2013) https://doi.org/10.1117/12.2027078

KEYWORDS: Sensors, Gamma radiation, Boron, Carbon, Crystals, Semiconductors, Absorption, Particles, Crystallography, Selenium

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Proceedings Article | 26 September 2013 Paper

Paper

Photoemission analysis of chemically modified TlBr surfaces for improved radiation detectors

A. Nelson, J.-S. Lee, J. Stanford, W. Grant, L. Voss, P. Beck, R. Graff, E. Swanberg, A. Conway, R. Nikolic, S. Payne, H. Kim, L. Cirignano, K. Shah

Proceedings Volume 8852, 88520E (2013) https://doi.org/10.1117/12.2021675

KEYWORDS: Surface finishing, Thallium, Bromine, Chlorine, Sensors, Chemical analysis, Chemistry, Polishing, Heterojunctions, Synchrotron radiation

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Proceedings Article | 17 October 2012 Paper

Paper

Application of TlBr to nuclear medicine imaging

Leonard Cirignano, Hadong Kim, Alireza Kargar, Alexei Churilov, Guido Ciampi, William Higgins, Suyoung Kim, Bradford Barber, Kyle Haston, Kanai Shah

Proceedings Volume 8508, 850803 (2012) https://doi.org/10.1117/12.961447

KEYWORDS: Sensors, Single photon emission computed tomography, Crystals, Semiconductors, Gamma radiation, Solids, Signal attenuation, Scintillators, Nuclear medicine, Semiconductor materials

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Proceedings Article | 28 September 2011 Paper

Paper

Long-term room temperature stability of TlBr gamma detectors

A. Conway, L. Voss, A. Nelson, P. Beck, R. Graff, R. Nikolic, S. Payne, H. Kim, L. Cirignano, K. Shah

Proceedings Volume 8142, 81420J (2011) https://doi.org/10.1117/12.896713

KEYWORDS: Sensors, Gold, Bromine, Thallium, Crystals, Polishing, Chlorine, Etching, Electrodes, Surface finishing

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Proceedings Article | 28 September 2011 Paper

Paper

Lithium and boron based semiconductors for thermal neutron counting

Alireza Kargar, Joshua Tower, Huicong Hong, Leonard Cirignano, William Higgins, Kanai Shah

Proceedings Volume 8142, 81421P (2011) https://doi.org/10.1117/12.899363

KEYWORDS: Sensors, Gamma radiation, Boron, Crystals, Semiconductors, Lithium, Absorption, Chemical species, Selenium, Carbon

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Proceedings Article | 3 September 2010 Paper

Paper

Continued development of room temperature semiconductor nuclear detectors

Hadong Kim, Leonard Cirignano, Alexei Churilov, Guido Ciampi, Alireza Kargar, William Higgins, Patrick O'Dougherty, Suyoung Kim, Michael Squillante, Kanai Shah

Proceedings Volume 7806, 780604 (2010) https://doi.org/10.1117/12.864147

KEYWORDS: Sensors, Mercury, Semiconductors, Gamma radiation, Spectroscopy, Crystals, Electrodes, Temperature metrology, Amplifiers, Thallium

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Proceedings Article | 12 September 2009 Paper

Paper

HgS: a rugged, stable semiconductor radiation detector material

Michael Squillante, William Higgins, Hadong Kim, Leonard Cirignano, Guido Ciampi, Alexei Churilov, Kanai Shah

Proceedings Volume 7449, 74491U (2009) https://doi.org/10.1117/12.829374

KEYWORDS: Mercury, Sensors, Crystals, Minerals, Semiconductors, Semiconductor materials, Gamma radiation, Scintillators, Manufacturing, Signal detection

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Proceedings Article | 4 September 2008 Paper

Paper

Purification, crystal growth and detector performance of TlBr

Alexei Churilov, William Higgins, Guido Ciampi, Hadong Kim, Leonard Cirignano, Fred Olschner, Kanai Shah

Proceedings Volume 7079, 70790K (2008) https://doi.org/10.1117/12.794838

KEYWORDS: Sensors, Crystals, Diffraction, Sensor performance, Etching, Semiconductors, Annealing, Gamma radiation, Materials analysis, Thallium

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Proceedings Article | 24 September 2007 Paper

Paper

Investigation of TlBr detector response under high-flux x-rays

Hadong Kim, Leonard Cirignano, Yuri Dmitriev, Mike Squillante, Philip Wong, Kanai Shah

Proceedings Volume 6706, 67061F (2007) https://doi.org/10.1117/12.734779

KEYWORDS: Sensors, X-rays, Polarization, X-ray detectors, Signal detection, Crystals, Electrons, Electrodes, Amplifiers, Gold

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Proceedings Article | 21 October 2004 Paper

Paper

Large-size CdZnTe (Zn=10%) radiation detector materials and device performance

Longxia Li, Fengying Lu, Chun Lee, Marc Black, Ralph James, H. Walter Yao, Arnold Burger, Michael Groza, Richard Olsen, Leonard Cirignano, Donald Ouimette

Proceedings Volume 5540, (2004) https://doi.org/10.1117/12.566740

KEYWORDS: Sensors, Indium, Crystals, Sensor performance, Electronics, Cadmium, Lithium, Energy efficiency, Electrons, Spectroscopy

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Proceedings Article | 20 January 2004 Paper

Paper

Evaluation of CZT detectors with capacitive Frisch grid structure

Leonard Cirignano, Hadong Kim, Kanai Shah, Misha Klugerman, Philip Wong, Michael Squillante, Longxia Li

Proceedings Volume 5198, (2004) https://doi.org/10.1117/12.507891

KEYWORDS: Sensors, Cesium, Metals, Americium, Electrons, Spectroscopes, Collimation, Dielectrics, Semiconductors, Gamma radiation

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Proceedings Article | 20 January 2004 Paper

Paper

New progress in large-size CZT single-crystal growth for nuclear radiation detectors

Longxia Li, Fengying Lu, Chun Lee, H. Walter Yao, Arnold Burger, M. Groza, G. Wright, Ralph James, Richard Olsen, Paul Luke, Kanai Shah, Leonard Cirignano, Michael Squillante, Donald Ouimette

Proceedings Volume 5198, (2004) https://doi.org/10.1117/12.507745

KEYWORDS: Cadmium, Crystals, Sensors, Indium, Doping, Lithium, Gamma radiation, Nuclear radiation, Semiconducting wafers, Sodium

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Proceedings Article | 10 January 2003 Paper

Paper

Development of a large single-crystal (3-inch ingot) CdZnTe for large-volume nuclear radiation detectors

Longxia Li, Fengying Lu, Chun Lee, Gomez Wright, David Rhiger, Sanghamitra Sen, Kanai Shah, Michael Squillante, Leonard Cirignano, Ralph James, Arnold Burger, Paul Luke, Richard Olson

Proceedings Volume 4784, (2003) https://doi.org/10.1117/12.453826

KEYWORDS: Sensors, Crystals, Tellurium, Zinc, Cadmium, Nuclear radiation, Gamma radiation, Gold, X-rays, Semiconducting wafers

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Proceedings Article | 26 November 2002 Paper

Paper

Current mode operation of a Cd0.9Zn0.1Te detector for CT imaging

William Barber, Koji Iwata, Bruce Hasegawa, Paul Bennett, Leonard Cirignano, Kanai Shah

Proceedings Volume 4786, (2002) https://doi.org/10.1117/12.455944

KEYWORDS: Sensors, X-rays, X-ray computed tomography, Single photon emission computed tomography, X-ray detectors, Zinc, Tellurium, X-ray imaging, Cadmium, Imaging systems

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Proceedings Article | 21 November 2000 Paper

Paper

Characterization of multi-element CZT arrays

Leonard Cirignano, Kanai Shah, Paul Bennett, Longxia Li, Fengying Lu, Joseph Buturlia, H. Walter Yao, Gomez Wright, Ralph James

Proceedings Volume 4141, (2000) https://doi.org/10.1117/12.407600

KEYWORDS: Sensors, Collimation, Multi-element lenses, Gamma radiation, Detector arrays, Chemical elements, Particles, Chlorine, Floods, X-rays

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Proceedings Article | 19 October 1999 Paper

Paper

Bismuth iodide crystals as a detector material: some optical and electrical properties

Yuriy Dmitriyev, Paul Bennett, Leonard Cirignano, Mikhail Klugerman, Kanai Shah

Proceedings Volume 3768, (1999) https://doi.org/10.1117/12.366625

KEYWORDS: Crystals, Bismuth, Sensors, Lead, X-ray detectors, X-rays, Iodine, Chemical species, Thulium, Crystallography

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Proceedings Article | 11 October 1999 Paper

Paper

Characterization of screen-printed dye-sensitized nanocrystalline TiO2 solar cells

Tapan Gupta, Leonard Cirignano, Kanai Shah, Larry Moy, David Kelly, Michael Squillante, Gerald Entine, Greg Smestad

Proceedings Volume 3789, (1999) https://doi.org/10.1117/12.367565

KEYWORDS: Ruthenium, Solar cells, Glasses, Electrons, Scanning electron microscopy, Quantum efficiency, X-ray diffraction, Particles, Electrodes, Titanium dioxide

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Proceedings Article | 6 October 1999 Paper

Paper

Planar APD arrays for high-resolution PET

Kanai Shah, Richard Farrell, Leonard Cirignano, Ronald Grazioso, Paul Bennett, Simon Cherry, Yiping Shao

Proceedings Volume 3770, (1999) https://doi.org/10.1117/12.368173

KEYWORDS: Avalanche photodetectors, Positron emission tomography, Crystals, Quantum efficiency, Sensors, Scintillators, Silicon, Spatial resolution, Scintillation, Semiconducting wafers

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Proceedings Article | 6 October 1999 Paper

Paper

PbI2 for high-resolution digital x-ray imaging

Kanai Shah, Paul Bennett, Yuriy Dmitriyev, Leonard Cirignano, Misha Klugerman, Michael Squillante, Robert Street, Jeffrey Rahn, Steve Ready

Proceedings Volume 3770, (1999) https://doi.org/10.1117/12.368179

KEYWORDS: Lead, Sensors, X-rays, Imaging systems, X-ray imaging, Modulation transfer functions, X-ray detectors, Image resolution, Spatial resolution, Crystals

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Proceedings Article | 1 July 1998 Paper

Paper

X-ray imaging with semiconductor films

Kanai Shah, Paul Bennett, Leonard Cirignano, Yuriy Dmitriyev, Mikhail Klugerman, Krishna Mandal, Larry Moy, Robert Street

Proceedings Volume 3446, (1998) https://doi.org/10.1117/12.312883

KEYWORDS: X-rays, Sensors, X-ray imaging, Lead, X-ray detectors, Spatial resolution, Imaging systems, Amorphous silicon, Scintillators, Electrodes

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Proceedings Article | 18 October 1996 Paper

Paper

Avalanche photodiodes for anticoincidence detectors

Leonard Cirignano, Richard Farrell, Robert Redus, Michael Squillante, Stanley Hunter, Rajani Cuddapah, Reshmi Mukherjee

Proceedings Volume 2806, (1996) https://doi.org/10.1117/12.254007

KEYWORDS: Avalanche photodetectors, Sensors, Scintillators, Gamma radiation, Particles, Muons, Space telescopes, Avalanche photodiodes, Signal to noise ratio, Quantum efficiency

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Showing 5 of 31 publications

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