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Physics Programs & Projects

(showing 76 - 90 of 250)
Technetium-99m Primary Standardization and International Comparison
Last Updated Date: 08/31/2015

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

New Reference Standards for Digital Mammography
Last Updated Date: 08/31/2015

Reference radiation beams using a tungsten target and silver, rhodium, molybdenum and aluminum filters at 20 kVp to 50 kVp were developed to model … more

Alpha-gamma Counting for High Accuracy Fluence Measurement
Last Updated Date: 08/31/2015

The Alpha-Gamma device is a totally-absorbing neutron detector that has been used to measure the absolute neutron fluence of a cold, monoenergetic … more

EUV Zone Plates for Compact Solar Radiometers
Last Updated Date: 08/28/2015

This project is developing zone plate technology to enable compact solar radiometers for observing the solar 30.4-nm emission from ionized helium … more

New Standardization of Ra-228
Last Updated Date: 08/26/2015

Measurements of radium isotopes in the naturally-occurring radioactive decay chains (i.e., 235 U, 238 U, and 232 Th) are exceedingly important for … more

Neutron Device Calibrations
Last Updated Date: 08/25/2015

NIST provides the national reference for the calibration of neutron radiation detectors and for neutron personnel dosimeters.  more

Lyman-Alpha Neutron Detector (LAND)
Last Updated Date: 08/25/2015

The well-known interaction of low-energy neutrons and 3 He produces a proton and a triton with 764 keV of kinetic energy shared between the two … more

Evolution of Image Spatial Resolution
Last Updated Date: 08/25/2015

Measuring the through-plane water content in a hydrogen fuel cell is critical to understanding this complicated heat and mass transport … more

Synchrotron Radiation-based Ultraviolet Source Calibrations
Last Updated Date: 08/25/2015

Bilateral comparison of synchrotron radiation-based deuterium lamp calibrations between the Physikalisch-Technische Bundesanstalt PTB and NIST. more

Use of a laser-driven plasma source in ultraviolet-detector calibrations
Last Updated Date: 08/25/2015

The National Institute of Standards and Technology operates two spectral comparator facilities, both of which are used to provide detector … more

Quantum Dot coated CMOS CID arrays for the UV and VUV
Last Updated Date: 08/25/2015

A technique has been developed for coating commercial off the shelf (COTS) detector arrays with a thin, uniform layer of quantum dots. The quantum … more

Long-Term Monitoring of the Ultraviolet Irradiance Scale
Last Updated Date: 08/25/2015

In 2004, the National Institute of Standards and Technology NIST established the ultraviolet spectral irradiance scale from 200 nm to 400 nm using … more

Calibration of the Extreme UV/X-ray Irradiance Sensor (EXIS) for the Geostationary Operations Environment Satellite R-Series Program (GOES-R)
Last Updated Date: 08/25/2015

Calibrations of the The Extreme ultraviolet/X-ray Irradiance Sensor (EXIS), which will be installed on the Geostationary Operations Environment … more

Advanced Neutron Imaging Facility
Last Updated Date: 08/25/2015

The NIST Neutron Imaging Facility (NNIF) at the NIST Center for Neutron Research .

Neutron Imaging of Lithium and Alkaline Batteries
Last Updated Date: 08/25/2015

A common topic in energy systems is the need for in situ measurement of the mass transport of light ion species such as hydrogen or lithium.   … more

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