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Physics Programs & Projects

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Search for Time Reversal Violation in Polarized Neutron Decay (emiT)
Last Updated Date: 08/14/2015

The "emiT" experiment searched for time-reversal symmetry violation term in neutron beta decay. It did so by measuring electron-proton coincidence … more

Pico-Watt ACR
Last Updated Date: 08/14/2015

The goal of the Pico-Watt ACR project (pW-ACR) is to develop an absolute cryogenic radiometer (ACR) able to calibrate 1 pW of optical power with … more

BIB-trap detector
Last Updated Date: 08/14/2015

The goal of the BIB-Trap Detector project is to develop a detector composed of solid-state devices that can be used as a reference detector for … more

Transfer radiometers and reference detectors
Last Updated Date: 08/14/2015

We have developed several portable radiometers to transfer the primary detector-based scales for optical power, radiance, and irradiance in the … more

Absolute cryogenic infrared radiometry at the LBIR facility
Last Updated Date: 08/14/2015

In support of defense programs in remote sensing, NIST maintains the scale for infrared radiant flux by using an Absolute Cryogenic radiometer … more

Testing of Radiation Detection Systems
Last Updated Date: 08/12/2015

NIST is working together with the Department of Homeland Security (DHS) Domestic Nuclear Detection Office (DNDO) in testing radiation detection … more

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

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

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