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Radiation Physics Programs & Projects

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Radioactivity Standard Reference Material Program
Last Updated Date: 07/01/2015

The Standard Reference Materials Program of the National Institute of Standards and Technology (NIST) provides science, industry, and government … more

Precision Measurement of the Branching Ratio and Energy Spectrum of Radiative Neutron Decay
Last Updated Date: 07/01/2015

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

Californium Neutron Irradiation Facility
Last Updated Date: 07/01/2015

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

New Reference Standards for Digital Mammography
Last Updated Date: 06/24/2015

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

National Air-Kerma Standard for Electronic Brachytherapy
Last Updated Date: 06/23/2015

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

Test and Evaluation Protocols for ANSI/IEEE N42 Standards
Last Updated Date: 06/22/2015

The purpose of these test and evaluation protocols is to provide additional information to the published ANSI/IEEE N42 series for homeland … more

Standards Development for Detection of Illicit Trafficking of Radioactive
Last Updated Date: 06/22/2015

The National Institute of Standard and Technology (NIST) is working in the development of ANSI/IEEE and IEC standards for the detection of illicit … more

Gamma-ray Spectrometry System
Last Updated Date: 06/22/2015

NIST is equipped with a high resolution gamma-ray spectrometry system used for activity and impurity measurements of gamma-ray emitting sources … more

Testing of Radiation Detection Systems
Last Updated Date: 06/22/2015

NIST is working together with the Department of Homeland Security (DHS) Domestic Nuclear Detection Office (DNDO) in testing radiation detection … more

Continuous Spin-Exchange Optical Pumping in High Flux Neutron Beams
Last Updated Date: 06/15/2015

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

X-ray Detection with Large Area Avalanche Photodiodes for the Neutron Radiative Decay Experiment
Last Updated Date: 06/12/2015

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

Active Interrogation Standards
Last Updated Date: 06/12/2015

Active interrogation involves directing nuclear radiation into a closed container and measuring secondary radiations to gain information about the … more

Wide-Angle Neutron Polarization Analysis
Last Updated Date: 06/12/2015

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

Pushing and Understanding the Limits of Spin-Exchange Optical Pumping of He-3
Last Updated Date: 06/12/2015

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

National and International Standards for X-ray Security Screening Applications
Last Updated Date: 06/11/2015

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

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