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Search Publications by: Huaiyu Heather Chen-Mayer (Fed)

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Displaying 1 - 25 of 70

Calibration of a gamma ray Compton camera for radioactivity measurements

September 10, 2024
Author(s)
Heather H. Chen-Mayer, Dagistan Sahin, Bryan Remley, Steven Brown, David Goodman
A dual-plane Compton imaging detector previously developed for prompt gamma imaging has been further tested and calibrated for quantitative radioactivity determination, specifically to assess radioactive debris from a reactor fuel element containing

Measurement of Chloride in Concrete by Prompt Gamma Neutron Activation

September 1, 2024
Author(s)
Richard A. Livingston, Preethi Sridhar, Neal Berke, Amde M. Amde, Heather H. Chen-Mayer
Prompt Gamma Activation Analysis (PGAA) is an elemental analysis method based on radiative neutron capture that is isotope-specific and has a high sensitivity to chlorine (Cl). To evaluate the feasibility of replacing the conventional wet chemistry method

Emission Ghost Imaging: reconstruction with data augmentation

February 1, 2024
Author(s)
Kevin J. Coakley, Heather H. Chen-Mayer, Bruce D. Ravel, Daniel Josell, Nikolai Klimov, Sarah Robinson, Daniel S. Hussey
Ghost Imaging enables 2D reconstruction of an object even though particles transmitted or emitted by the object of interest are detected with a single pixel detector without spatial resolution. This is possible because the incident beam is spatially

PGAA measurement of chloride diffusion profiles in concrete cylinders

July 21, 2023
Author(s)
Heather H. Chen-Mayer, Neal Berke, Richard Livingston
Chloride diffusion is correlated with corrosion of steel reinforcement in concrete structures. The current standard method for estimating chloride diffusion profile is by destructive chemical analysis. This work investigates the feasibility of Prompt Gamma

Classification and Authentication of Materials using Prompt Gamma Ray Activation Analysis

July 12, 2023
Author(s)
Nathan Mahynski, Jacob Monroe, David Sheen, Rick L. Paul, Heather H. Chen-Mayer, Vincent K. Shen
Prompt gamma ray activation analysis (PGAA) is a non-destructive nuclear measurement technique that quantifies isotopes present in a sample. Here, we use PGAA spectra to train different types of models to elucidate how discriminating these spectra are for

Calorimetry in Computed Tomography Beams

March 10, 2022
Author(s)
Heather H. Chen-Mayer, Ronald Tosh, Fred B. Bateman, Paul Bergstrom, Brian E. Zimmerman
A portable calorimeter for direct realization of absorbed dose in medical computed tomography (CT) procedures was constructed and tested in a positron emission tomography (PET) CT scanner. The calorimeter consists of two small thermistors embedded in a

Prompt-gamma activation analysis and its application to cultural heritage

January 25, 2022
Author(s)
Zsolt Kasztovszky, Christian Stieghorst, Heather H. Chen-Mayer, Richard Livingston, Richard M. Lindstrom
Prompt-gamma activation analysis (PGAA) provides a unique opportunity to investigate valuable material without destroying any of it. The method is perfectly applicable to investigate valuable objects belonging to our cultural heritage, as well as other

Quantifying and Suppressing Proton Intercalation to Enable High-Voltage Zn-Ion Batteries

November 4, 2021
Author(s)
Fei Wang, Lauren E. Blanc, Qin Li, Antonio Faraone, Xiao Ji, Huaiyu H. Chen-Mayer, Rick L. Paul, Joseph Dura, Enyuan Hu, Kang Xu, Linda F. Nazar, Chunsheng Wang
We explore the Zn-ion intercalation mechanisms/interfacial dynamics of VPO 4F and quantify the water dynamics in water-in-salt (WISE) and hybrid aqueous-non aqueous electrolytes (HANEs). We demonstrate that H + intercalation dominates electrochemical

High-Resolution Ultrasonic Thermometer for Radiation Dosimetry

October 12, 2021
Author(s)
Eugene Malyarenko, Joseph Heyman, Heather H. Chen-Mayer, Ronald Tosh
This paper describes recent developments in the area of high-precision This paper describes recent developments in the area of high-precision ultrasonic thermometry with the potential to provide on-site direct determination of radiation dose and its

Chopped Cold Neutron Beam Activation Analysis

May 17, 2021
Author(s)
Danyal J. Turkoglu, Heather H. Chen-Mayer
A linear fast neutron beam chopper has been deployed at the prompt gamma activation analysis instrument, enabling in-beam activation analysis of short-lived (T1/2 > 10 ms) neutron capture products without needing sample transfer. This paper describes the

Feasibility Study of Compton Imaging for PGAA

October 1, 2019
Author(s)
Heather H. Chen-Mayer, Steven Brown, Hao Yang
We are developing a one-sided tomographic method for imaging prompt gamma rays, without moving the source, sample, or detector, in a standard prompt gamma activation analysis (PGAA) setting. Dual-plane pixelated CZT detectors developed from a commercial

Observation of Plasmon-Phonons in a Metamaterial Superconductor using Inelastic Neutron Scattering

July 24, 2019
Author(s)
Vera N. Smolyaninova, Jeffrey W. Lynn, Nicholas Butch, Heather H. Chen-Mayer, Joseph C. Prestigiacomo, M. S. Osofsky, Igor I. Smolyaninov
Recent experiments have demonstrated that the metamaterial approach is capable of drastically increasing the critical temperature, T c, of composite metal-dielectric epsilon near zero (ENZ) metamaterial superconductors. For example, a tripling of the

Spectroscopic Compton Imaging of Prompt Gamma Emission at the MeV Energy Range

October 1, 2018
Author(s)
Haijian Chen, Heather H. Chen-Mayer, Danyal J. Turkoglu, Benjamin Riley, Emily Draeger, jerimy Polf
Prompt gamma activation analysis (PGAA) is a bulk elemental analysis technique using gamma rays emitted immediately following neutron capture. Spatial information about the composition within the sample could be obtained with PGAA in a time-consuming

Assessment of PGAA capability for low-level measurements of H in Ti alloy

December 1, 2017
Author(s)
Danyal J. Turkoglu, Huaiyu H. Chen-Mayer, Rick L. Paul, Rolf L. Zeisler
The accuracy of low-level hydrogen measurements with prompt gamma-ray activation analysis (PGAA) depends on identifying and accounting for all background H signal, including interfering signals. At the cold-neutron (CN)PGAA facility at the NIST Center for