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Physics Programs & Projects

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Spectrometry of X-Ray Beams Used for Calibrations
Last Updated Date: 06/26/2012

Spectrometry measurements in the x-ray calibration ranges have been undertaken using a high-resolution HPGe detector both in the direct beam and … more

Advancing Alanine Dosimetry for Small Radiosurgery Fields
Last Updated Date: 06/26/2012

Research is underway to expand the current range (20 Gy to 200 kGy) of alanine dosimetry to include therapy level dosimetry (as low as 1 Gy) for … more

International Comparisons for Air Kerma and Absorbed Dose to Water from Gamma-ray Beams
Last Updated Date: 06/26/2012

A bilateral comparison was conducted between NIST and the International Atomic Energy Agency (IAEA) to support international efforts for … more

Standard Reference Data on Radiation Interactions
Last Updated Date: 06/26/2012

NIST has nearly five decades of experience in the development of critically evaluated, comprehensive databases of cross-section information for … more

Evaluation of Uncertainty in Brachytherapy Dosimetry
Last Updated Date: 06/26/2012

NIST is participating in Task Group # 138 (TG-138) of the American Association of Physicists in Medicine (AAPM), AAPM Recommendations on Assessing … more

Calibrations of a Miniature X-ray Source Used for Electronic Brachytherapy
Last Updated Date: 06/26/2012

A new laboratory dedicated to establishing a national primary air-kerma rate standard for Xoft's AXXENT™ miniature x-ray source has been … more

Applications of Diagnostic X-ray Spectrometers
Last Updated Date: 06/26/2012

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

Applied Quantum Information Science
Last Updated Date: 05/30/2012

Theory is being developed and used to devise methods for preserving and exploiting the quantum behavior of ever-larger systems and finding … more

Light-matter Interactions in Semiconductor Nanostructures
Last Updated Date: 05/30/2012

The quantum optics of light interacting with semiconductor-based nanostructures is being studied to extend concepts of entanglement and coherence … more

Designing the Nanoworld: Nanostructures, Nanodevices, and Nanooptics
Last Updated Date: 05/30/2012

Nanoscale theory of the electronic, optical and mechanical properties of ultrasmall structures, devices and their dynamical operation and the … more

Modeling and Simulation of Nanofabrication
Last Updated Date: 03/09/2012

Most manufacturing has historically been based on top-down fabrication and assembly.  With rapid advances in nanotechnology, there is increasing … more

Spectroradiometry of sources
Last Updated Date: 12/15/2011

Calibration standards for spectral radiance and spectral irradiance are disseminated in the form of transfer lamps and integrating sphere sources. … more

Ultracold atoms and molecules
Last Updated Date: 12/08/2011

Theory for ultracold atomic and molecular collisions and interactions is being developed and exploited to gain precise control over these … more

Aperture area measurements
Last Updated Date: 11/03/2011

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

Nonlinear Optics and Non-classical Light
Last Updated Date: 10/04/2011

Nonlinear optics provides a way to generate light with different frequencies and different quantum statistical properties. We have developed a … more

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