Dr. Andrew N. Mabe Profile

Dr. Andrew N. Mabe

at Lawrence Livermore National Lab

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Author

Publications (3)

Proceedings Article | 17 September 2019 Presentation

Developments in lithium-loaded plastic scintillators with pulse shape discrimination (Conference Presentation)

Andrew Mabe, Leslie Carman, Andy Glenn, Steven Dazeley, Steve Payne, Natalia Zaitseva

Proceedings Volume 11114, 1111408 (2019) https://doi.org/10.1117/12.2531532

KEYWORDS: Scintillators, Lithium, Scintillation, Quenching (fluorescence), New and emerging technologies

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Proceedings Article | 18 September 2018 Presentation

Recent developments in PSD plastics: optimization, attenuation, and additives (Conference Presentation)

Andrew Mabe, M. Leslie Carman, Andrew Glenn, Steven Dazeley, Natalia Zaitseva, Steve Payne

Proceedings Volume 10762, 107620E (2018) https://doi.org/10.1117/12.2322072

KEYWORDS: Signal attenuation, Scintillators, Scintillation, Lithium, Matrices

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Proceedings Article | 2 November 2016 Presentation

Organic scintillators with pulse shape discrimination for detection of radiation (Conference Presentation)

Andrew Mabe, M. Leslie Carman, Andrew Glenn, Natalia Zaitseva, Stephen Payne

Proceedings Volume 9968, 99680I (2016) https://doi.org/10.1117/12.2238015

KEYWORDS: Scintillators, Gamma radiation, Glasses, Scintillation, Nuclear physics, Homeland security, Medical imaging, Polymers, Additive manufacturing, Liquids

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The detection of neutrons in the presence of gamma-ray fields has important applications in the fields of nuclear physics, homeland security, and medical imaging. Organic scintillators provide several attractive qualities as neutron detection materials including low cost, fast response times, ease of scaling, and the ability to implement pulse shape discrimination (PSD) to discriminate between neutrons and gamma-rays. This talk will focus on amorphous organic scintillators both in plastic form and small-molecule organic glass form. The first section of this talk will describe recent advances and improvements in the performance of PSD-capable plastic scintillators. The primary advances described in regard to modification of the polymer matrix, evaluation of new scintillating dyes, improved fabrication conditions, and implementation of additives which impart superior performance and mechanical properties to PSD-capable plastics as compared to commercially-available plastics and performance comparable to PSD-capable liquids. The second section of this talk will focus on a class of small-molecule organic scintillators based on modified indoles and oligophenylenes which form amorphous glasses as PSD-capable neutron scintillation materials. Though indoles and oligophenylenes have been known for many decades, their PSD properties have not been investigated and their scintillation properties only scantily investigated. Well-developed synthetic methodologies have permitted the synthesis of a library of structural analogs of these compounds as well as the investigation of their scintillation properties. The emission wavelengths of many indoles are in the sensitive region of common photomultiplier tubes, making them appropriate to be used as scintillators in either pure or doped form. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. This work has been supported by the U.S. Department of Energy Office of Nonproliferation Research and Development (NA-22) and by the Defense Threat Reduction Agency (DTRA).

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