Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Lizbeth Laureano-Perez (Fed)

Dr. Lizbeth Laureano-Pérez has served as the Co-coordinator of the SRM program in the Radioactivity Group and Radiation Physics Division (RPD), Physical Measurement Laboratory (PML), at the National Institute of Standards and Technology (NIST) since June 2005. She has effectively supported the production and standardization of standard reference materials (SRM's) from production to standardization. Her work includes the preparation of SRMs, radioactive solutions and sources for measurement in different methods. Her focus is in the standardization of various radionuclides, using 4παβ liquid scintillation (LS) spectrometry and CIEMAT/NIST method. Her thorough experimental work and investigation skills have led to the publication of technical papers and have been instrumental in the issuance of complete and accurate standardization/certification of SRMs. Lizbeth also has assisted Group colleagues in various projects from environmental to nuclear medicine and participated as NIST lead in several important and significant international measurement comparisons.

Lizbeth received recognition in May 2006 for her guidance and leadership in upgrading and reinvigorating the Radioactivity SRM program resulting in increased productivity; in December 2008 NIST Bronze Medal Award, "For the revitalization and expansion of the NIST radioactive SRM program" and in October 2010 for exceptional efforts, leadership and exemplary technical skills in NIST's participation in the international comparison of the activity of 241Pu.


Primary standardization of 212Pb activity by liquid scintillation counting

Denis E. Bergeron, Jeffrey T. Cessna, Ryan P. Fitzgerald, Lizbeth Laureano-Perez, Leticia Pibida, Brian E. Zimmerman
An activity standard for 212Pb in equilibrium with its progeny was realized, based on triple-to-double coincidence ratio (TDCR) liquid scintillation (LS)

Primary standardization of Ra-224 activity by liquid scintillation counting

Denis E. Bergeron, Jeffrey T. Cessna, Ryan P. Fitzgerald, Brian E. Zimmerman, Lizbeth Laureano-Perez, Ronald Colle, Leticia S. Pibida, Elisa Napoli
A standard for 224Ra activity has been developed, based on triple-to-double coincidence ratio (TDCR) liquid scintillation (LS) counting. The standard was

Preparation and calibration of a Protactinium-231 reference material

Richard Essex, Ross W. Williams, Kerri C. Treinen, Ronald Colle, Ryan P. Fitzgerald, Raphael Galea, John Keightley, Jerome LaRosa, Lizbeth Laureano-Perez, Svetlana Nour, Leticia Pibida
A 231Pa reference material has been characterized for amount of Pa. This reference material is primarily intended for calibration of 233Pa tracers produced for

New determination of the 229Th half-life

Richard Essex, Jacqueline L. Mann, Ronald Colle, Lizbeth Laureano-Perez, Megan E. Bennett, Heather Dion, Ryan P. Fitzgerald, Amy M. Gaffney, Amelie Hubert, Robert E. Steiner, Ross W. Williams, Alkiviadis Gourgiotis, William S. Kinman
A new determination of the 229Th half-life was made based on measurements of the 229Th massic activity of a high-purity solution for which the 229Th molality
Created October 3, 2019, Updated December 7, 2022