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Radiation Physics Portal

Programs and Projects
Precision Measurement of the Branching Ratio and Energy Spectrum of Radiative Neutron Decay

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

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

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

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

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

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

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

Beamline 2: Spectrometer Calibrations

Absolute irradiance calibrations based on the calculability of synchrotron radiation are performed on beamline 2. See GOES-R/EXIS and SDO as … more

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