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Physics Programs & Projects

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Primary Radioactivity Standardization of Ni-63
Last Updated Date: 08/12/2015

Ni-63 is of considerable interest and importance in radionuclidic metrology as well as for radiation protection surveillance around nuclear … more

Quantification of the Alpha Wall Effect in Liquid Scintillation Counting
Last Updated Date: 08/12/2015

A long-standing uncertainty in liquid scintillation (LS) counting has been the possible loss of counting efficiency.

International Comparison of Tc-99
Last Updated Date: 08/12/2015

An international measurement comparison for a 99 Tc solution hosted by National Physical Laboratory (NPL) of the UK, (CCRI(II)K-2. 99 Tc … more

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

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