Dr. Rastgo Hawrami Profile

Dr. Rastgo Hawrami

at Xtallized Intelligence, Inc.

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Author

Publications (16)

Proceedings Article | 9 October 2024 Presentation + Paper

Characterization of elpasolite (Cs,Tl)2LiLaBr6:Ce (CTLLB) crystal performance after sequential gamma irradiation exposure

E. Ariesanti, R. Hawrami, H. Parkhe, V. Buliga, A. Burger, M. Duff, C. Verst, S. Uba, S. Babalola

Proceedings Volume 13151, 1315104 (2024) https://doi.org/10.1117/12.3029901

KEYWORDS: Crystals, Gamma radiation, Scintillators, Thallium, Scintillation, Materials properties, Sensors, Ions

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Proceedings Article | 3 October 2022 Presentation

Melt growth vs. ceramic fabrication for advanced inorganic scintillators (Conference Presentation)

Rastgo Hawrami, Elsa Ariesanti, Arnold Burger

Proceedings Volume PC12241, PC1224104 (2022) https://doi.org/10.1117/12.2634950

KEYWORDS: Ceramics, Scintillators, Crystals

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Proceedings Article | 5 March 2021 Presentation + Paper

Mid-IR emission characteristics of low-phonon erbium-doped ternary chloride-based single crystals

E. Brown, Z. Fleischman, R. Hawrami, E. Ariesanti, A. Burger, U. Hömmerich, S. Trivedi, M. Dubinskii

Proceedings Volume 11682, 116820R (2021) https://doi.org/10.1117/12.2579430

KEYWORDS: Mid-IR, Crystals, Erbium, Spectroscopy, Phonons, Ions, Surgery, Solid state lasers, Semiconductor lasers, Remote sensing

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Proceedings Article | 20 August 2020 Presentation

Growth and characterization study of K2PtCl6 type scintillators

Rastgo Hawrami, Stephanie Lam, Elsa Ariesanti, Denise Huerta, Vlad Buliga, Hemin Parkhe, Shariar Motakef, Arnold Burger

Proceedings Volume 11494, 1149402 (2020) https://doi.org/10.1117/12.2567369

KEYWORDS: Scintillators, Crystals, Scintillation, Sensors

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Proceedings Article | 15 September 2017 Presentation + Paper

History and current status of strontium iodide scintillators

N. Cherepy, P. Beck, S. Payne, E. Swanberg, B. Wihl, S. Fisher, S. Hunter, P. Thelin, C. Delzer, S. Shahbazi, A. Burger, K. Shah, R. Hawrami, L. Boatner, M. Momayezi, K. Stevens, M. Randles, D. Solodovnikov

Proceedings Volume 10392, 1039202 (2017) https://doi.org/10.1117/12.2276302

KEYWORDS: Crystals, Sensors, Strontium, Radioisotopes, Scintillators, Europium, Gamma radiation, Spectrometers, Scintillation

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Proceedings Article | 26 August 2015 Paper

Linearity response of Ca2+-doped CeBr3 as a function of gamma-ray energy

Paul Guss, Michael Foster, Bryan Wong, F. Doty, Kanai Shah, Michael Squillante, Urmila Shirwadkar, Rastgo Hawrami, Josh Tower, Thomas Stampahar, Sanjoy Mukhopadhyay

Proceedings Volume 9593, 959304 (2015) https://doi.org/10.1117/12.2186181

KEYWORDS: Crystals, Calcium, Doping, Scintillators, Sensors, Spectroscopy, Ions, Cerium, Gamma radiation, Photons

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Proceedings Article | 9 September 2014 Paper

Strontium iodide instrument development for gamma spectroscopy and radioisotope identification

P. Beck, N. Cherepy, S. Payne, E. Swanberg, K. Nelson, P. Thelin, S. Fisher, S. Hunter, B. Wihl, K. Shah, R. Hawrami, A. Burger, L. Boatner, M. Momayezi, K. Stevens, M. Randles, D. Solodovnikov

Proceedings Volume 9213, 92130N (2014) https://doi.org/10.1117/12.2063056

KEYWORDS: Crystals, Sensors, Radioisotopes, Prototyping, Strontium, Scintillation, Data modeling, Performance modeling, Scintillators, Digital electronics

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Proceedings Article | 26 September 2013 Paper

Studies on Ca2+-doped CeBr3 scintillating materials

Paul Guss, Michael Foster, Bryan Wong, F. Patrick Doty, Kanai Shah, Michael Squillante, Urmila Shirwadkar, Rastgo Hawrami, Josh Tower, Ding Yuan

Proceedings Volume 8854, 885406 (2013) https://doi.org/10.1117/12.2021342

KEYWORDS: Crystals, Scintillators, Scintillation, Cerium, Optical properties, Electrons, Calcium, Sensors, Chemical species, Gamma radiation

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Proceedings Article | 26 September 2013 Paper

Temperature behavior of CLYC/MPPC detectors

Jarek Glodo, Mickel McClish, Rastgo Hawrami, Patrick O'Dougherty, Josh Tower, Andrey Gueorguiev, Kanai Shah

Proceedings Volume 8852, 88520X (2013) https://doi.org/10.1117/12.2028235

KEYWORDS: Sensors, Gamma radiation, Crystals, Scintillators, Temperature metrology, Connectors, Silicon photomultipliers, Photomultipliers, Energy efficiency, Signal detection

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Proceedings Article | 28 May 2013 Paper

Scintillator based beta batteries

Noa Rensing, Timothy Tiernan, Urmila Shirwadkar, Patrick O'Dougherty, Sara Freed, Rastgo Hawrami, Michael Squillante

Proceedings Volume 8728, 87280V (2013) https://doi.org/10.1117/12.2017000

KEYWORDS: Scintillators, Wind energy, Crystals, Solar energy, Strontium, Radioisotopes, Visible radiation, Solar radiation, Photodiodes, Scintillation

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Proceedings Article | 24 October 2012 Paper

Latest advances in large diameter SrI:Eu and CLYC:Ce scintillators for isotope identification

R. Hawrami, C. Hines, I. Abselem, V. Biteman, J. Vaghini, J. Glodo, P. O'Dougherty, K. Shah, Nerine Cherepy, Stephen Payne, Arnold Burger, Lynn Boatner

Proceedings Volume 8507, 850716 (2012) https://doi.org/10.1117/12.945937

KEYWORDS: Crystals, Scintillators, Gamma radiation, Sensors, Scintillation, Quartz, Spectrometers, Chemical species, Control systems, Diamond

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Scintillator crystal detectors form the basis for many radiation detection devices. Therefore, a search for high light yield single crystal scintillators with improved energy resolution, large volume, and the potential for low cost, is an ongoing process that has increased in recent years due to a large demand in the area of nuclear isotope identification. Alkaline earth halides, elpasolites and rare earth halides are very interesting because many compositions from these crystal families provide efficient Ce3+/ Eu2+ luminescence, good proportionality and good energy resolution. They also have small band-gap leading to higher light yields. Ce3+and Eu2+ are efficient, and the emission wavelengths in the 350-500 nm region matches well with PMTs and a new generation of Siphotodiodes. In this presentation, we will the present progress made in the crystal growth of these compositions, and scintillator properties of large diameter SrI2:Eu2+ single transparent crystals. The crystals were grown successfully using the vertical Bridgeman technique. Crystals with different diameters of 1”, 1.3”, and 1.5” will be discussed. SrI2:Eu was discovered a half century ago, and was recently found to be an outstanding material for gamma ray-spectroscopy with high light yield, very good non-proportionality, and excellent energy resolution. We will also discuss growth and properties of larger Cs2LiYCl6 (CLYC) crystals. Recently, it has been shown that crystals from the elpasolite family, including CLYC, can be successfully employed for a dual gamma ray and neutron detection, which is possible with the help of pulse shape discrimination (PSD). PSD allows for recognition of an incident particle’s nature based on the shape of the corresponding scintillation pulse. CLYC has the potential to minimize the cost and complexity of dual sensing gamma ray and neutron spectrometers. We also address progress in growth of CLYC crystals with large diameters (1” and 2”) that are transparent and crack free.

Proceedings Article | 28 September 2011 Paper

Performance of europium-doped strontium iodide, transparent ceramics and bismuth-loaded polymer scintillators

N. Cherepy, S. Payne, B. Sturm, S. O'Neal, Z. Seeley, O. Drury, L. K. Haselhorst, B. Rupert, R. Sanner, P. Thelin, S. Fisher, R. Hawrami, K. Shah, A. Burger, J. Ramey, L. Boatner

Proceedings Volume 8142, 81420W (2011) https://doi.org/10.1117/12.896656

KEYWORDS: Scintillators, Ceramics, Crystals, Strontium, Spectroscopy, Scintillation, Gamma radiation, Garnet, Bismuth, Radiography

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Proceedings Article | 12 September 2009 Paper

SrI[sub]2[/sub] scintillator for gamma ray spectroscopy

N. Cherepy, B. Sturm, O Drury, T. Hurst, S. Sheets, L. Ahle, C. Saw, M. Pearson, S. Payne, A. Burger, L. Boatner, J. Ramey, E. van Loef, J. Glodo, R. Hawrami, W. Higgins, K. Shah, W. Moses

Proceedings Volume 7449, 74490F (2009) https://doi.org/10.1117/12.830016

KEYWORDS: Crystals, Gamma radiation, Scintillators, Spectroscopy, Scintillation, Strontium, X-ray diffraction, Europium, Crystal optics, Single crystal X-ray diffraction

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Proceedings Article | 12 September 2009 Paper

Dual gamma neutron detection with Cs[sub]2[/sub]LiLaCl[sub]6[/sub]

Jarek Glodo, Rastgo Hawrami, Edgar van Loef, William Higgins, Urmila Shirwadkar, Kanai Shah

Proceedings Volume 7449, 74490E (2009) https://doi.org/10.1117/12.830127

KEYWORDS: Cerium, Crystals, Sensors, Gamma radiation, Scintillators, Oscilloscopes, Luminescence, Spectroscopy, Scintillation, Homeland security

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Proceedings Article | 4 September 2008 Paper

SrI[sub]2[/sub]: a novel scintillator crystal for nuclear isotope identifiers

R. Hawrami, M. Groza, Y. Cui, A. Burger, M. Aggarwal, Nerine Cherepy, Stephen Payne

Proceedings Volume 7079, 70790Y (2008) https://doi.org/10.1117/12.798335

KEYWORDS: Crystals, Scintillators, Scintillation, Gamma radiation, Photography, Physics, Strontium, Calcium, Europium, Temperature metrology

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Proceedings Article | 17 September 2007 Paper

Photo-EPR studies of photorefractive BaTiO3 heavily doped with Cr3+: evidence of photoinduced dissociation of Cr3+ dimers

Sundar Bairavarasu, Matthew Edwards, Medury Sastry, Tatiana Kukhtareva, Holger Jaenisch, Rastgo Hawrami, Dimitrios Lianos, Manmohan Aggarwal

Proceedings Volume 6698, 669805 (2007) https://doi.org/10.1117/12.735039

KEYWORDS: Chromium, Iron, Crystals, Ions, Data modeling, Magnetism, Ferroelectric materials, Absorption, Switching, Differential equations

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Showing 5 of 16 publications

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