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Physics Programs & Projects

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Calibration of Low-Energy Photon Brachytherapy Sources
Last Updated Date: 08/31/2015

Small radioactive "seed" sources used in prostate brachytherapy, containing the radionuclide 103 Pd, 125 I, or 131 Cs, are calibrated in terms of … more

National Air-Kerma Standard for Electronic Brachytherapy
Last Updated Date: 08/31/2015

The Dosimetry Group has developed a new facility for the calibration of the Xoft miniature x-ray source, which provides low-energy x-rays (< 50 … more

Calibration of Beta-Particle Sources and Instruments for Radiation Protection
Last Updated Date: 08/31/2015

A calibration service for protection-level beta-particle sources and instrumentation has been in place at NIST for several years.

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

Atomic Standard for Pressure
Last Updated Date: 08/28/2015

NIST scientists are developing a highly accurate primary standard for pressure in the range 2 MPa to 7 MPa based on fundamental physical … 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

SDO/EVE/ESP Calibration
Last Updated Date: 08/25/2015

NASA launched the Solar Dynamics Observatory ( SDO ) satellite on 11 Feb 2010 on a mission to study the sun. The EUV Variability Experiment ( EVE … 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

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