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Physics Programs & Projects

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Frequency Comb Calibration of Astronomical Spectrographs
Last Updated Date: 08/17/2015

We have constructed portable frequency combs that have provided in situ calibration of astronomical spectrographs, to aid in the search for … more

Californium Neutron Irradiation Facility
Last Updated Date: 08/17/2015

NIST maintains the Californium Neutron Irradiation Facility (CNIF), which is an exposure facility providing fast neutrons for irradiations … more

Precision Measurement of the Branching Ratio and Energy Spectrum of Radiative Neutron Decay
Last Updated Date: 08/17/2015

Neutron beta-decay is typically considered as a three-body process, but it is always accompanied by inner-bremsstrahlung soft photons, n → e − + p … more

Reflectance Measurements of Human Skin
Last Updated Date: 08/17/2015

The purpose of this human subjects study is to collect high-quality measurements of the reflectance spectrum of human skin and assess the … more

Dynamic Pressure
Last Updated Date: 08/17/2015

Manufacturing processes by their very nature require a judicious, time-dependent use of pressure and temperature to transform a base material into … more

Hyperspectral Image Projector (HIP)
Last Updated Date: 08/17/2015

Detecting climate change with remote sensing instruments, providing state-of-the-art surveillance imagery for security and defense, or getting the … more

Aperture area measurements
Last Updated Date: 08/17/2015

Radiometric and photometric measurements require defining apertures. The accuracy to which these measurements can be accomplished requires … more

Diffuse Optical Properties of Materials
Last Updated Date: 08/17/2015

Diffuse optical properties are critical parameters for understanding the interaction of light with tissues and other optically diffusive materials. more

Standard Reference Data on Radiation Interactions
Last Updated Date: 08/17/2015

NIST is in its seventh decade of providing critically evaluated, comprehensive databases of cross-section information for ionizing photons (x and … more

Accelerator Facilities
Last Updated Date: 08/17/2015

The Radiation Physics Division's accelerator facilities continue to support a broad range of research efforts in the areas of industrial and … more

National and International Standards for X-ray Security Screening Applications
Last Updated Date: 08/17/2015

The primary objective of this project is to assure the technical performance and radiation safety of the nation’s x-ray and gamma-ray security … more

Photon Absorbed-Dose-to-Water Primary Standards
Last Updated Date: 08/17/2015

Computational and experimental studies to obtain correction factors for heat defect, heat transfer and scattering/perturbation for the water … more

Electron and Proton Absorbed-Dose-to-Water Primary Standards
Last Updated Date: 08/17/2015

Work on absorbed-dose standards for particle beams is in progress, with preliminary results obtained for both high-energy electrons (at the NIST … more

Remote Sensing Methods for Imaging Dose to Water
Last Updated Date: 08/17/2015

Calorimetry based upon remote sensing of the temperature field in an irradiated volume would offer distinct advantages over the present approach, … more

Applications of Diagnostic X-ray Spectrometers
Last Updated Date: 08/14/2015

The Dosimetry Group designs, fabricates, and calibrates bent-crystal optics and diagnostic spectrometers for customers around the world. more

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