27 citations · 75 across the 11 of their papers we have counts for
11 papers
Data-driven performance optimization of gamma spectrometers with many channels
Jayson R. Vavrek, Hannah S. Parrilla, Gabriel Aversano +3
In gamma spectrometers with variable spectroscopic performance across many channels (e.g., many pixels or voxels), a tradeoff exists between including data from successively worse-…
Demonstration of a new CLLBC-based gamma- and neutron-sensitive free-moving omnidirectional imaging detector
Jayson R. Vavrek, Ryan Pavlovsky, Victor Negut +4
We have developed a CLLBC-based gamma- and neutron-sensitive multi-channel omnidirectional imaging detector, suitable for handheld or vehicle-borne operation and capable of quantit…
Simulations of Sparse Static Detector Networks for City-Scale Radiological/Nuclear Detection
E. Rofors, N. Abgrall, M. S. Bandstra +6
Sparse static detector networks in urban environments can be used in efforts to detect illicit radioactive sources, such as stolen nuclear material or radioactive "dirty bombs". We…
Surrogate distributed radiological sources III: quantitative distributed source reconstructions
Jayson R. Vavrek, Jaewon Lee, Marco Salathe +4
In this third part of a multi-paper series, we present quantitative image reconstruction results from aerial measurements of eight different surrogate distributed gamma-ray sources…
Mobile Object Tracking in Panoramic Video and LiDAR for Radiological Source-Object Attribution and Improved Source Detection
M. R. Marshall, R. J. Cooper, J. C. Curtis +4
The addition of contextual sensors to mobile radiation sensors provides valuable information about radiological source encounters that can assist in adjudication of alarms. This st…
Networked Sensing for Radiation Detection, Localization, and Tracking
R. J. Cooper, N. Abgrall, G. Aversano +18
The detection, identification, and localization of illicit radiological and nuclear material continue to be key components of nuclear non-proliferation and nuclear security efforts…
Background and Anomaly Learning Methods for Static Gamma-ray Detectors
M. S. Bandstra, N. Abgrall, R. J. Cooper +8
Static gamma-ray detector systems that are deployed outdoors for radiological monitoring purposes experience time- and spatially-varying natural backgrounds and encounters with man…
Design and deployment of radiological point-source arrays for the emulation of continuous distributed sources
Jayson R. Vavrek, C. Corey Hines, Mark S. Bandstra +6
We demonstrate a method for using arrays of point sources that emulate -- when measured from a standoff of at least several meters -- distributed gamma-ray sources, and present res…
Free-moving Quantitative Gamma-ray Imaging
Daniel Hellfeld, Mark S. Bandstra, Jayson R. Vavrek +11
The ability to map and estimate the activity of radiological source distributions in unknown three-dimensional environments has applications in the prevention and response to radio…
Improved Gamma-Ray Point Source Quantification in Three Dimensions by Modeling Attenuation in the Scene
M. S. Bandstra, D. Hellfeld, J. R. Vavrek +8
Using a series of detector measurements taken at different locations to localize a source of radiation is a well-studied problem. The source of radiation is sometimes constrained t…
Reconstructing the Position and Intensity of Multiple Gamma-Ray Point Sources with a Sparse Parametric Algorithm
Jayson R. Vavrek, Daniel Hellfeld, Mark S. Bandstra +8
We present an experimental demonstration of Additive Point Source Localization (APSL), a sparse parametric imaging algorithm that reconstructs the 3D positions and activities of mu…