A5038436410- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Luminescence Properties of Advanced Materials
- Neutrino Physics Research
- Radioactive contamination and transfer
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Particle physics theoretical and experimental studies
- Radioactivity and Radon Measurements
- Radiation Effects and Dosimetry
- Polymer composites and self-healing
- Polymer Nanocomposite Synthesis and Irradiation
- International Science and Diplomacy
- Radioactive Decay and Measurement Techniques
- Radiation Therapy and Dosimetry
- Spacecraft Design and Technology
- Polymer Foaming and Composites
- Silicone and Siloxane Chemistry
- Space exploration and regulation
- Radiation Dose and Imaging
Lawrence Livermore National Laboratory
2015-2021
University of Tennessee at Knoxville
2011-2014
Novel <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$^{6}{\rm Li}$</tex> </formula> -loaded polyester scintillation films have been designed and fabricated to detect thermal neutrons. Lithium fluoride crystals containing enriched Li}$</tex></formula> were synthesized integrated into polyethylene naphthalate matrix appropriate luminescent molecules. Thermal neutron capture by ions produces charged...
A series of novel <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> Li-loaded plastic scintillation films have been designed and fabricated to detect thermal neutrons. Organolithium salts containing enriched Li were synthesized interspersed in a matrices comprising polymer doped with an antenna fluor. Thermal neutron capture by produces charged particles kinetic energy which is sufficient ionize excite the polymeric matrix. This collected...
Thin film polystyrene composite scintillators containing <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mrow><mml:mtext>L</mml:mtext><mml:mtext>i</mml:mtext><mml:mtext>F</mml:mtext></mml:mrow><mml:mrow><mml:mn fontstyle="italic">6</mml:mn></mml:mrow></mml:mrow></mml:math> and organic fluors have been fabricated tested as thermal neutron detectors. Varying fluorescence emission intensities for different compositions are interpreted in terms of the Beer-Lambert...
Detection of special nuclear materials (SNM) requires instruments that can detect and characterize uranium plutonium isotopes, having at the same time ability to discriminate among different types radiation. For many decades, neutron detection has been based on 3 He proportional counters sensitive primarily thermal neutrons. The most common methods for fast neutrons have liquid scintillators with pulse shape discrimination (PSD). shortage handling issues stimulated a search efficient...
Proceedings for the 14th installment of Applied Antineutrino Physics (AAP) workshop series.
Thin polymeric films are evaluated in this research as a potential replacement technology for radiation portal monitors where specific attention is given to the physical basis neutron-photon discrimination. It shown that difference energy deposition mechanics from charged particle reaction products and Compton scattered electrons allows effective discrimination between neutrons gammas. One goal of study was establish optimal thickness maximize neutron interactions simultaneously minimize...
The development of efficient, robust plastic scintillators with pulse shape discrimination (PSD) has been much interest in recent years. As is the case many new technologies, initial formulations for PSD plastics provided capabilities that have required in-depth research to refine. Herein we describe continued results from extensive optimization studies led improved scintillation performance and physical properties. Improvements formulation provide a groundwork which element-loaded can be...
We present a new conceptual radiation detector, the Architected Multimaterial Scintillator System, that utilizes scintillator composed of multiple materials arranged in architected structures to enable capabilities. By structuring differently-dyed materials, wavelength scintillation light encodes additional information measurements. These can be realized through additive manufacture (3D-printing). Two classes this concept are described and modelled using Monte Carlo simulations evaluate...
The detection of neutrons in the presence gamma-ray fields has important applications nuclear physics, homeland security, and medical imaging. Organic scintillators provide several attractive qualities as neutron materials including low cost, fast response times, ease scaling, ability to implement pulse shape discrimination (PSD) discriminate between gamma-rays. This talk will focus on amorphous organic both plastic form small-molecule glass form. first section this describe recent advances...
Pulse shape discrimination in plastic scintillators has been of much interest recent years. As with many innovative technologies, initial formulations for PSD plastics provided new capabilities that required in-depth research to fully develop and refine. Herein we describe results from extensive optimization studies which have led the development markedly improved scintillation performance physical properties. Results exploring different matrices as well a variety secondary dyes are reported...