A5006103927- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Nuclear and radioactivity studies
- Radioactive element chemistry and processing
- Particle Detector Development and Performance
- Hydrology and Sediment Transport Processes
- Graphite, nuclear technology, radiation studies
- Hydrology and Watershed Management Studies
- Fish Ecology and Management Studies
- Soil erosion and sediment transport
- Nuclear Materials and Properties
- Remote Sensing and LiDAR Applications
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Analytical chemistry methods development
- Remote Sensing in Agriculture
- Medical Imaging Techniques and Applications
- Groundwater flow and contamination studies
- Forest Insect Ecology and Management
- Geophysical Methods and Applications
- Species Distribution and Climate Change
- Seismology and Earthquake Studies
Pacific Northwest National Laboratory
2016-2024
Pacific Northwest Research Station
2022-2023
US Forest Service
2022
Battelle
2019-2021
Atomic Weapons Establishment
2010-2019
University of Surrey
2014-2015
Degraded floodplains and valley floors are restored with the goal of enhancing habitat for native fish aquatic-riparian biota protection or improvement water quality. Recent years have seen a shift toward “process-based restoration” that is intended to reestablish compromised ecogeomorphic processes resulting from site- watershed-scale degradation. One form process-based restoration has developed in Pacific Northwest, United States, reconnect rivers their by slowing down flows sediment,...
In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at cold neutron beam facility PF1B Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements γ-rays following neutron-induced capture and fission reactions. The setup consisted collimation system producing pencil with thermal equivalent flux about 108 n s−1cm−2 target position negligible halo. surrounded by an eight ten anti-Compton shielded EXOGAM Clover...
Abstract The South Fork McKenzie River (SFMR) in western Oregon, USA hosts one of the largest Stage 0 stream restoration projects implemented to date. refers a multichannel planform with strong hydrologic connectivity adjacent floodplain and surface–subsurface connectivity. was on 900‐m‐long reach SFMR by re‐grading channel using 65,000 m 3 sediment raise bed. Thousands large logs were added ends some buried provide foundations for future log jams. Our primary objective is present monitoring...
Abstract Radionuclides are monitored in the atmosphere for signatures of nuclear explosions, as part verification Comprehensive Nuclear-Test-Ban Treaty (CTBT). Civil facilities, such Nuclear Power Plants (NPPs) and Isotope Production Facilities (IPFs) sources anthropogenic radionuclides these sometimes indistinguishable to those a explosion. In order improve understanding civil radionuclide-emitting facilities their impact on International Monitoring System (IMS) CTBT, group scientists from...
Sudden increases in the background gamma-radiation dose may occur due to removal of 222Rn and 220Rn progeny from atmosphere by wet deposition mechanisms. This contribution has been measured using a Geiger–Muller detector at Atomic Weapons Establishment (Aldermaston, UK) during July 2005–April 2006. The results are approximated log-normal distribution there were nine separate occurrences exceeding 125% geometric mean value. associated with periods heavy rainfall, although no correlation was...
The performance of the diffusive gradient in thin film technique (DGT) was evaluated as a tool for long-term monitoring water quality, using uranium case study. DGTs with Metsorb™ (TiO2) sorbent were deployed consecutively at two alkaline freshwater sites, River Enborne and Lambourn, UK seven-day intervals over five-month deployment period to obtain time weighted average concentrations. Weekly spot samples taken determine physical chemical properties river water. Uranium measured these after...
The production of $^{3}$H, $^{7}$Be, and $^{22}$Na by interactions cosmic-ray particles with silicon can produce radioactive backgrounds in detectors used to search for rare events. Through controlled irradiation CCDs wafers a neutron beam that mimics the spectrum, followed direct counting, we determined rate from neutrons at sea level is ($112 \pm 24$) atoms/(kg day) ($8.1 1.9 $) ($43.0 7.1 $^{22}$Na. Complementing these results current best estimates activation cross sections other than...
Pacific Northwest National Laboratory (PNNL) staff developed the Radionuclide Aerosol Sampler Analyzer (RASA) for worldwide aerosol monitoring in 1990s. Recently, researchers at PNNL and Creare, LLC, have investigated possibilities how RASA could be improved, based on lessons learned from more than 15 years of continuous operation, including during Fukushima Daiichi Nuclear Power Plant disaster. Key themes addressed upgrade include having a modular approach to additional radionuclide...
Abstract In the early years of nuclear explosion monitoring, experts used downwind detections with meaningful ratios radioactive species to identify an explosion. Today’s reality is sparse networks radionuclide monitoring stations looking for weak signals. Analysts need discriminate between industrial background radioactivity and signals, even using detection one isotope. Aerosol xenon measurements potentially related tests in 2006 2013 announced by Democratic People’s Republic Korea from...