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Physics Programs & Projects

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ANSI/IEEE N42.42 Standard
Last Updated Date: 08/12/2015

The purpose of the N42 data format is to facilitate manufacturer-independent transfer of information from radiation measurement instruments for … more

Ultrafast Molecular Switch Dynamics Examined by Mid-Infrared Femtosecond Spectroscopy
Last Updated Date: 08/12/2015

Ultrashort mid-infrared laser pulses are used to observe fast molecular and photochemical reaction processes occurring in the condensed phase. We … more

National Technical Nuclear Forensics CRMs
Last Updated Date: 08/12/2015

The U.S. Department of Homeland Security (DHS) is committed to using cutting-edge technologies and scientific talent in its quest to make America … more

Test and Evaluation Protocols for ANSI/IEEE N42 Standards
Last Updated Date: 08/12/2015

The purpose of these test and evaluation protocols is to provide additional information to the published ANSI/IEEE N42 series for homeland … more

Gamma-ray Spectrometry System
Last Updated Date: 08/12/2015

NIST is equipped with a high resolution gamma-ray spectrometry system used for activity and impurity measurements of gamma-ray emitting sources … more

Standards Development for Detection of Illicit Trafficking of Radioactive
Last Updated Date: 08/12/2015

The National Institute of Standard and Technology (NIST) is working in the development of ANSI/IEEE and IEC standards for the detection of illicit … more

Calibration of Epoxy Based Ba-133 Standard Phantom Sources for Use in an International Comparison for Quantitative SPECT
Last Updated Date: 08/12/2015

The International Atomic Energy Agency (IAEA) recently initiated a Cooperative Research Project (CRP) entitled “Development of Quantitative … more

Calibrations of Large-Volume, Solid Ge-68 Phantom Sources for Monitoring PET Scanner Performance in Clinical Trials
Last Updated Date: 08/12/2015

The interpretation of quantitative imaging data obtained from Positron Emission Tomography (PET) studies requires an understanding of the … more

Automated Multi-Sample Ionization Chamber for Radioactivity Standards
Last Updated Date: 08/12/2015

Precise calibration of short-lived radioactive material is essential for nuclear medicine and power plant applications. Scientists in the NIST … more

Primary Standardization of Radionuclides by Anticoincidence Counting
Last Updated Date: 08/12/2015

The standardization of radionuclides by primary methods is the foundation for all the standards and services provided by the NIST radioactivity … more

NIST Laboratory for Quantitative PET-CT Imaging
Last Updated Date: 08/12/2015

As part of a NIST-wide effort to develop a metrological infrastructure for quantitative medical imaging, the Radioactivity Group established a … more

Terahertz Bi-Directional Reflection Function Measurements and Imaging for Homeland Security
Last Updated Date: 08/11/2015

Far-infrared (or THz, 25 to 300 micron wavelength) femtosecond laser methods are employed to generate high power (ca. 1 µJ) broadband pulses for … more

Hydrogen Generation in Di-Iron Hydrogenase Mimics
Last Updated Date: 08/11/2015

Discovery of novel materials to facilitate hydrogen gas production has prompted new avenues of research towards developing hydrogen as an … more

Dosimetry Standardization for Radiobiology
Last Updated Date: 08/10/2015

A program for the development of dosimetry standards for radiobiology was launched through a highly successful workshop. The … more

Far-infrared Spectroscopy of Biomolecules
Last Updated Date: 08/10/2015

Far-infrared (or terahertz/THz, ca. 25 to 300 micron wavelength) femtosecond pulsed laser and Fourier-transform infrared methods are employed to … more

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