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

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Displaying 1 - 25 of 60

Emission Ghost Imaging: reconstruction with data augmentation

February 1, 2024
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

Classification and Authentication of Materials using Prompt Gamma Ray Activation Analysis

July 12, 2023
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
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

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

November 4, 2021
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
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

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

July 24, 2019
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

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

December 1, 2017
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

Standardizing CT Lung Density Measure Across Scanner Manufacturers

March 1, 2017
Huaiyu H. Chen-Mayer, Matthew Fuld, Bernice Hoppel, Phillip Judy, Junfeng Guo, David Lynch, Antonio M. Possolo, Sean B. Fain
Computed Tomography imaging of the lung, reported in Hounsfield Units (HU), can be parameterized as a quantitative image biomarker for the diagnosis and monitoring of lung density changes due to emphysema, a type of chronic obstructive pulmonary disease

ITRAP+10 Spectroscopic Radiation Portal Monitor Testing

November 14, 2013
Anne L. Sallaska, Leticia S. Pibida, Huaiyu H. Chen-Mayer, Luc Murphy, Christina Ward
The Illicit Trafficking Radiation Assessment Program (ITRAP+10) is an international effort of the Department of Homeland Security’s Domestic Nuclear Detection Office (DHS/DNDO), the European Commission’s Joint Research Center (EC-JRC), and the

Standard Reference Materials for Medical CT

June 27, 2013
Zachary H. Levine, Huaiyu H. Chen-Mayer, Adam L. Pintar, Daniel S. Sawyer
NIST Standard Reference Materials 2087 and 2088 for medical computed tomography (CT) have become available. The materials allow CT reconstructions to be tied to the International System of Units in length, density, and mass attenuation coefficient.

Time-resolved radiation beam profiles in water obtained by ultrasonic tomography

December 31, 2010
Eugene Malyarenko, Joseph Heyman, Heather H. Chen-Mayer, Ronald Tosh
This paper presents a practical ultrasonic system for near real-time imaging of spatial temperature distributions in water caused by absorption of radiation. Initial testing with radiation from a highly attenuated infrared lamp demonstrates that the system