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Physics Portal - Overview

Physics research at NIST includes everything from improving the safety of medical radiation procedures to developing future "quantum information" technologies that generate unbreakable codes. NIST provides the measurements, standards, and technical expertise scientists and industries need to push the limits of the fundamental properties of nature.


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Programs and Projects
Air Kerma Measurements in High Energy X-ray Beams

Cargo-inspection systems employ high-energy x-ray beams from accelerators. These systems are designed to detect potential threats that may be … more

Key Comparison for Air-Kerma From Therapy Level and Radiation Protection Gamma-Ray Beams

Comparisons for the national standards of air kerma from therapy level and radiation protection gamma-ray beams were conducted by the NIST and the … more

Characterization of Dosimeters Used in Computed Tomography

In an effort to both reduce and improve the monitoring of radiation dose delivered to patients during computed tomography (CT) procedures, the … more

Air Kerma Calibrations in Radiation Protection Level 137Cs and 60Co Gamma Ray Beams

The Dosimetry Group maintains and disseminates the national measurement standards for air-kerma (exposure) from 137 Cs and 60 Co gamma-ray beams … more

Design and Construction of a New Cs-137 Gamma-ray Calibration Facility

The construction of a new primary calibration facility for air kerma measurements has been completed. It delivers a collimated 137 Cs gamma-ray … more

International Comparisons for Air Kerma and Absorbed Dose to Water from Gamma-ray Beams

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

Synchrotron Ultraviolet Radiation Facility SURF III

The Synchrotron Ultraviolet Radiation Facility SURF III is operated by the National Institute of Standards and Technology NIST as a stable light … more

Beamline 3: Center for Advanced Synchrotron Radiation-Based Metrology

Streamlining Detector-based Radiometry at SURF III NIST has maintained the Synchrotron Ultraviolet Radiation Facility SURF for nearly 6 decades as … more

Medical-Industrial Radiation Facility

The Medical-Industrial Radiation Facility (MIRF) located in the  Radiation Physics Division  of the NIST  Physical Measurement Laboratory is a … more

Radiopharmaceutical Standardization Laboratory

Radioactivity measurements for diagnostic and therapeutic nuclear medicine in the United States are based on measurements at NIST. Activity … more

Missile defense transfer radiometer (MDXR)

The Missile Defense transfer Radiometer (MDXR) is a cryogenic transfer radiometer for providing calibrations of collimated infrared beams in … more

Beamline 4: Ultraviolet Optical Properties and Calibrations

Beamline 4 is a general purpose radiometric beamline consists of a 2 m monochromator to disperse radiation from SURF III. An Absolute Cryogenic … more

Electron holography

An electron hologram is a fringe modulated image containing the amplitude and phase information of an electron transparent object. The HolograFREE … more

Noncollinear phase matching in uniaxial and biaxial crystals

Although significant work has been done to characterize collinear phase matching and to present many of its applications, noncollinear phase … more

FPGA-based multicoincidence recipe and software

This project allows investigators to build their own data acquisition instruments to collect and statistically process data in real time, then … more

Old Version of FPGA


Modeled integrated scattering tool (MIST)

The MIST program has been developed to provide users with a general application to model an integrated scattering system. The program performs an … more


SCATMECH is an object-oriented C++ class library developed to distribute models for light scattering applications. Included in the library are … more

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