Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Taking Measure

Just a Standard Blog

H. Heather Chen-Mayer

portrait of Heather Chen_mayer

H. Heather Chen-Mayer is a physicist at the National Institute of Standards and Technology (NIST). She applies neutron beam methods, such as prompt gamma activation analysis (PGAA), for composition analysis of objects related to cultural heritage and materials used in infrastructure. Her research interests include Compton imaging of prompt gamma rays, gamma-gamma coincidence spectroscopy, and pulsed beam PGAA. She has a Ph.D. in physics from the City University of New York.