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Radiation Physics Programs & Projects

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Neutron Interferometry with Polarized Neutrons as an Additional Degree of Freedom
Last Updated Date: 07/27/2015

Our goal is to apply Quantum Information Processing techniques to improve neutron interferometry contrast by making our final measurement … more

Precision Measurement of the Branching Ratio and Energy Spectrum of Radiative Neutron Decay
Last Updated Date: 07/21/2015

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

Wide-Angle Neutron Polarization Analysis
Last Updated Date: 07/21/2015

The capabilities of many neutron scattering instruments would be greatly enhanced by neutron polarization analyzers that can cover a wide angular … more

X-ray Detection with Large Area Avalanche Photodiodes for the Neutron Radiative Decay Experiment
Last Updated Date: 07/21/2015

Operation of the second neutron radiative decay experiment has been completed. In this experiment we observed the emission of photons that … more

Continuous Spin-Exchange Optical Pumping in High Flux Neutron Beams
Last Updated Date: 07/21/2015

We collaborated on tests at the Insitut Laue Langevin (ILL) to study the effects of high flux neutron beams on spin-exchange optical pumping … more

Neutron Device Calibrations
Last Updated Date: 07/21/2015

NIST provides the national reference for the calibration of neutron radiation detectors and for neutron personnel dosimeters.  more

Pushing and Understanding the Limits of Spin-Exchange Optical Pumping of He-3
Last Updated Date: 07/21/2015

Neutron spin filters based on polarized 3He rely on the strong spin dependence of the absorption of neutrons by 3He gas.

Neutron Source Strength Calibrations
Last Updated Date: 07/21/2015

The neutron source calibration facility operated by NIST is a world-class calibration laboratory providing neutron source calibration services for … more

Neutron Cross Section Standards
Last Updated Date: 07/21/2015

NIST continues to be deeply involved with measurements and evaluations of neutron cross section standards. NIST maintains a limited experimental … more

Californium Neutron Irradiation Facility
Last Updated Date: 07/16/2015

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

Measurement of the Parity Non-Conserving Neutron Spin Rotation in Liquid Helium
Last Updated Date: 07/09/2015

The Standard Model has been remarkably successful in describing weak interactions between leptons, leptons and hadrons, and in flavor-changing … more

Air Kerma Measurements in High Energy X-ray Beams
Last Updated Date: 07/06/2015

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
Last Updated Date: 07/06/2015

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
Last Updated Date: 07/06/2015

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
Last Updated Date: 07/06/2015

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

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