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Radiation Physics Programs & Projects

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Standardization of Am-243
Last Updated Date: 08/12/2015

A new standard solution of 243 Am, an important radionuclide for the US and international environmental-measurements communities, was developed … more

Blind Measurement Comparisons of the USA and UK Pb-210 National Standards
Last Updated Date: 08/12/2015

The National Institute of Standards and Technology (NIST), Radioactivity Group, and the National Physical Laboratory (NPL) of the UK, and the … more

International Comparison of Pu-241
Last Updated Date: 08/12/2015

All of the plutonium isotopes, which have a very high biotoxicity, are man-made and result from various nuclear activities. Plutonium-241 is a … more

Technetium-99m Primary Standardization and International Comparison
Last Updated Date: 08/12/2015

Technetium-99m ( 99m Tc) is used in two-thirds of all diagnostic nuclear medicine procedures in the United States.

New Statistical Analysis Tools
Last Updated Date: 08/12/2015

Members of the Radioactivity Group (RG) have been actively collaborating with statisticians in the NIST Statistical Engineering Division to … more

Radon Binding to Water-Soluble Cryptophane
Last Updated Date: 08/12/2015

Collaboration on investigating the thermodynamics of radon binding with a new and novel class of cryptophane molecules is currently underway with … more

Components of Variance in Liquid Scintillation Counting
Last Updated Date: 08/12/2015

As part of the standardization of the 239 Pu solution that was disseminated by NIST as Standard Reference Material (SRM) 4330C, a detailed study … more

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

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