Valerie Nwadeyi
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View article: Statistical analysis of the performance and long-term stability of unquenched LSC standards (3H, 14C) used for radiochemical measurements
Statistical analysis of the performance and long-term stability of unquenched LSC standards (3H, 14C) used for radiochemical measurements Open
Multiple sets of toluene-based unquenched standards, procured over the last 3 decades, were analyzed to determine their stability over time. A statistical analysis was performed to provide insight into the variability for tSIE and counting…
View article: Analysis of Radioactive Waste and Contamination using 3D Position-Sensitive CdZnTe Detectors
Analysis of Radioactive Waste and Contamination using 3D Position-Sensitive CdZnTe Detectors Open
INTRODUCTION The US has surplus plutonium. This material will be diluted in gloveboxes at SRS [Ref 1 and 2]. This process will create holdup. Holdup is material in an unexpected or unwanted location. Because this holdup material is primari…
View article: Detailed Characterization of CZT Detector Response for Improved Coded-Aperture Imaging Performance
Detailed Characterization of CZT Detector Response for Improved Coded-Aperture Imaging Performance Open
Gamma-ray imaging is a powerful method for locating and quantifying sources of radiation. The coded-aperture technique demonstrates superior angular resolution in comparison to other methods (e.g., Compton reconstruction). In this method, …
View article: Radiation Monitoring for Volatilized Zinc Contamination Using Gamma-Ray Imaging and Spectroscopy
Radiation Monitoring for Volatilized Zinc Contamination Using Gamma-Ray Imaging and Spectroscopy Open
Gamma-ray imaging is a tool that has grown in importance in the applications of non-destructive assay (NDA) for radioactive survey and analysis of nuclear facilities. Imaging techniques have shown great promise in providing valuable inform…
View article: Analysis of Radioactive 65 Zn Contamination using 3D Position Sensitive CdZnTe Detectors
Analysis of Radioactive 65 Zn Contamination using 3D Position Sensitive CdZnTe Detectors Open
SRNL\nNMG Goal: In collaboration with ORNL, the aim is to identify and\nexplore innovative technology opportunities that accelerate disposition,\nreduce life cycle costs, minimize worker radiation exposure, and improve\nworker safety and m…
View article: Implementation of a System of Gamma Imagers for Measuring Plutonium Holdup
Implementation of a System of Gamma Imagers for Measuring Plutonium Holdup Open
The Surplus Plutonium Disposition (SPD) project is an effort to dilute and dispose of many tonsof weapons grade plutonium. This work will take place in a shielded glovebox to protect workers fromradiological dose. Accurate measurements of …
View article: 3D Source Reconstruction Using Coded Aperture Gamma-Ray Imaging
3D Source Reconstruction Using Coded Aperture Gamma-Ray Imaging Open
Recent measurements with coded-aperture imagers demonstrate material mass determination in a holdup setting to an accuracy within a few percent. This capability is of particular interest to the Surplus Plutonium Disposition (SPD) project, …
View article: Experimental Study of Using a 3-D Position Sensitive CdZnTe Detector for Proton Beam Range Verification
Experimental Study of Using a 3-D Position Sensitive CdZnTe Detector for Proton Beam Range Verification Open
Position sensitive CdZnTe Compton imaging cameras are currently being studied for their use of proton beam range verification for radiotherapy applications. This work presents the use of an experimental large volume CdZnTe detector for the…
View article: Experimental Study of Using a 3-D Position Sensitive CdZnTe Detector for Proton Beam Range Verification
Experimental Study of Using a 3-D Position Sensitive CdZnTe Detector for Proton Beam Range Verification Open
This manuscript discusses the use of a large volume array CZT detector for experimental prompt gamma-ray imaging. Namely, the 718 keV and the 4.44 MeV photopeaks produced from proton-carbon interactions are imaged using maximum likelihood …
View article: Experimental Study of Using a 3-D Position Sensitive CdZnTe Detector for Proton Beam Range Verification
Experimental Study of Using a 3-D Position Sensitive CdZnTe Detector for Proton Beam Range Verification Open
This manuscript discusses the use of a large volume array CZT detector for experimental prompt gamma-ray imaging. Namely, the 718 keV and the 4.44 MeV photopeaks produced from proton-carbon interactions are imaged using maximum likelihood …
View article: Experimental Study of Using a 3-D Position Sensitive CdZnTe Detector for Proton Beam Range Verification
Experimental Study of Using a 3-D Position Sensitive CdZnTe Detector for Proton Beam Range Verification Open
Position sensitive CdZnTe Compton imaging cameras are currently being studied for their use of proton beam range verification for radiotherapy applications. This work presents the use of an experimental large volume CdZnTe detector for the…
View article: A MLEM Approach To Range Verification for Proton Beam Therapy Using 3-D Position Sensitive CdZnTe
A MLEM Approach To Range Verification for Proton Beam Therapy Using 3-D Position Sensitive CdZnTe Open
The viability of 3-D position sensing CdZnTe (CZT) semiconductor, high-resolution, gamma-ray spectrometry imaging systems have impacted a wide array of nuclear applications. The high performance of CZT at room temperature (<1% FWHM at 662 …