Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session G11: Applications of Nuclear PhysicsOn Demand
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Sponsoring Units: DNP Chair: Evie Downie, George Washington University Room: Maryland A |
Sunday, April 19, 2020 8:30AM - 8:42AM On Demand |
G11.00001: Health Physics Applications in Nuclear Forensics, Epidemiology, Radiological Emergency Response and even Regulatory Compliance. Robert Hayes, Ryan O'Mara, Fatma Abdelrahman, S. Joseph Cope Using the solid state dosimetry techniques of Thermoluminescence, Optically Stimulated Luminescence and Electron Paramagnetic Resonance, new research has now demonstrated novel applications in nuclear forensics and radiological emergency response dosimetry. These methods are already known for serving as the gold standard in epidemiology and archeological dating of particular environmental materials. Our research results do not only provide dosimetric measurements from external radiation sources, but also internal. If internal emitters are sought, then food and airborne radiological contamination would have to be characterized. Doing this with standard assay systems for confined materials has been done but also, rapid measurement techniques for discrimination of anthropogenic from naturally occurring radioaerosols (e.g., radon and its progeny) are also being developed. All of these are currently being accomplished in a single research group to be reviewed in this presentation. [Preview Abstract] |
Sunday, April 19, 2020 8:42AM - 8:54AM |
G11.00002: Predictions of secondary particle spectra inside the International Space Station (ISS) Mohammad Sabra As part of a study to assess the contribution of secondary particlesin producing radiation damage to astronauts as well as electronic devices located on the ISS, Geant4 calculations have been made to predict secondary particle spectra vs shielding inside ISS module. A simplified shielding model is used for the radiation transport calculations.The calculations take into account secondary particle production from Galactic Cosmic Rays (GCR) protons. Comparisons of the predicted particle spectra for different Geant4 nuclear physics models will be presented and discussed. [Preview Abstract] |
Sunday, April 19, 2020 8:54AM - 9:06AM |
G11.00003: Radiation Shielding and Dose Estimation for Nuclear Physics Experiment Devaki Bhatta Pathak Precise estimation of the radiation dose which can occurred during any nuclear physics experiment is very important, this helps us to design and develop the shielding for nuclear physics experiments accordingly and prevent any catastrophic damages to equipment. The simulation for radiation dose measurement was done using GEANT4 for PREX-II and MOLLER experiments. The dose measurement was done for neutron, and photon on detectors at different locations and compared to an experimental result. We found that, the result obtained from the simulation using GEANT4 is in close approximation to the actual dose during the PREX-II experiment providing a benchmark for simulation estimations of radiation dose. \sout{ } This result will be valuable for other upcoming MOLLER experiment in designing and developing realistic radiation shielding measures while minimizing the cost and effort. [Preview Abstract] |
Sunday, April 19, 2020 9:06AM - 9:18AM On Demand |
G11.00004: Detection of Subsurface Hydrogenous Material in Airless Planetary Bodies Using a Neutron Scintillation Cell Array Robert Haun, Charles Clark, Michael Coplan, Joshua Graybill, Timothy Livengood, Larry Lutz, Ann Parsons, Lester Putnam, Chandra Shahi, J.J. Su Neutrons generated by planetary bodies without an atmosphere are utilized as a measurement tool for locating subsurface hydrogenous material, namely water\footnote{Lawrence, D., J. Geophys. Res. Planets, 122, 21(2016)}. These neutrons are generated by subsurface spallation due to high energy cosmic rays incident on the airless planetary body. As neutrons diffuse out of the planetary body and undergo scattering events, the energy spectrum as seen by a surface or orbital observer will vary depending upon subsurface chemical composition. Hydrogenated materials are effective at moderating (or thermalizing) neutrons, which causes a large change of the thermal and epithermal neutron energy spectrum. This presents a clear signature of the presence of subsurface hydrogenous material. Our detector system consists of an array of scintillation cells utilizing thin film $^{10}$B, xenon gas, silicon photomultipliers (SiPMs) and a suite of attachments for determining neutron energy and direction. The simplicity of our components allows for flexible packaging with optimization for specific applications. This simple, low voltage, low pressure system has advantages for both lander and orbiter neutron detection. Detector architecture, current developments and applications will be described. This [Preview Abstract] |
Sunday, April 19, 2020 9:18AM - 9:30AM On Demand |
G11.00005: Improvements to the laser polarization measurement inside a Fabry-Perot cavity. Sachinthani Premathilake The Compton polarimeter at Jefferson Lab's experimental Hall A provides a continuous, non-invasive measurement of electron beam polarization via electron-photon scattering. The electron beam passing through the polarimeter intercepts green laser light stored in a Fabry-Perot cavity. Scattered electrons are detected in an electron detector while back scattered photons are detected in a GSO crystal calorimeter. For an accurate beam polarization measurement, the laser polarization inside the Fabry-Perot cavity must be well known. We have performed studies to optimize the laser polarization inside the cavity and to know it precisely. I will discuss the methods and results from these investigations. [Preview Abstract] |
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