Publications

Aug, 2026

Journal

Full spectrum modeling of in situ gamma-ray detector measurements with a focus on precipitation-induced transients

Gamma-ray detectors that are deployed outdoors experience increased event rates during precipitation due to the attendant increase in Rn-222 progeny at ground level. The increased radiation due to these decay products (Pb-214 and Bi-214) has been studied for many decades in applications such as atmospheric science and radiation protection. For those applications radon prog…

Jun, 2026

ORNL Report

PASSIVE CONFIRMATION OF THE PRESENCE OF HIGH-EXPLOSIVE MATERIAL VIA NEUTRON TRANSMISSION SPECTROSCOPY

Mar, 2026

Conference Paper

Passive Gamma-Ray Imaging as a Verification Tool for Nuclear Weapons Treaties

Feb, 2026

ORNL Report

Determination of particle-dependent light response for defining detector response functions

Jun, 2025

Journal

First Observation of P-odd gamma-Physical Asymmetry in Polarized Neutron Capture on Hydrogen

We report the first observation of the parity-violating 2.2 MeV gamma-ray asymmetry A^(np)_gamma in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. A^(np)_gamma isolates the Delta I = 1, ^3S_1-> ^3P_1 component of the weak nucleon-nucleon interaction, which is…

Sep, 2024

Journal

Tracking the location of a road-constrained radioactive source with a network of detectors

Data collected from a network of detectors and analyzed together has the opportunity to provide a more complete picture than when the data from each individual detector are analyzed independently. However, even with a dense array of detectors, the network data will not provide a complete picture and constraints will need to be added to the model in order to maximize the us…

Dec, 2023

ORNL Report

Modeling Urban Scenarios & Experiments: Fort Indiantown Gap Data Collections Summary and Analysis

Dec, 2023

Conference Paper

Understanding and quantifying the systematic effects of clutter within a radiation detection scene

Because of low signal-to-noise ratios, the main difficultly in real-world detection scenarios is distinguishing between benign sources and potentially-threatening radioactive materials. The variability in observed signal during a radiation detection search operation can be contributed to the stochastic nature of the underlying physics and the systematic errors inherent to…

Nov, 2023

Journal

Characterization of gamma-ray background outside of the High Flux Isotope Reactor

Static gamma-ray measurements collected between September 2017 and March 2018 in the vicinity of the High Flux Isotope Reactor (HFIR) and the Radiochemical Engineering Development Center (REDC) at Oak Ridge National Laboratory are presented. Temporal events are identified and tracked, including radioactive material transfers, rain events, and 41Ar emissions. The remaining…

Nov, 2023

Conference Paper

Automated Vehicle Detection in a Nuclear Facility Using Low-Frequency Acoustic Sensors

Nov, 2023

Journal

First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on 3He

We report the first precision measurement of the parity-violating asymmetry in the direction of proton momentum with respect to the neutron spin, in the reaction 3He(n,p)3H, using the capture of polarized cold neutrons in an unpolarized active 3He target. The asymmetry is a result of the weak interaction between nucleons, which remains one of the least well-understood aspe…

Nov, 2023

Conference Paper

Classification of Dissolution Events Using Fusion of Effluents Measurements and Classifiers

Classifiers for dissolution events at a radiochemical processing facility are studied using gamma spectra measurements of effluents collected by a high purity germanium detector located at its off-gas stack. Data sets collected at the Oak Ridge National Laboratory’s Radiochemical Engineering Development Center under a Pu dissolution campaign spanning a three months period…