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Physics Programs & Projects

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Quantum Sensors
Last Updated Date: 08/31/2015

The Quantum Sensors Project develops sensors based on quantum phenomena for spectroscopy, imaging, and other precision measurements for … more

Thermometry
Last Updated Date: 08/31/2015

The NIST Thermodynamic Metrology Group maintains and develops national standards of temperature (in the range 0.65 K to 1235 K), and supports … more

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.

Extreme Ultraviolet Detector Calibration Service
Last Updated Date: 08/31/2015

The extreme ultraviolet detector (EUVD) calibration service disseminates the U.S. national scale of detector responsivity in the wavelength range … more

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

Detector metrology
Last Updated Date: 08/28/2015

High performance optical radiometers with selected optical detectors are being designed, characterized, and calibrated in the Optical Radiation … 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

Newtonian constant of gravitation international consortium
Last Updated Date: 08/26/2015

The Newtonian constant of gravitation G is one of the most fundamental constants of classical physics. Recent measurements of G are in … more

Quantum Physics Theory
Last Updated Date: 08/25/2015

Theoretical work relevant to the determination of values of the fundamental constants, tests of bound-state quantum electrodynamics (QED), and … more

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