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Physics Programs & Projects

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High-Dose Dosimetry
Last Updated Date: 08/14/2015

The activities described here support the application of high-dose, high-energy ionizing radiation for a variety of industrial processes. … more

High-Dose Dosimetry Uncertainty Tables
Last Updated Date: 08/14/2015

The high-dose dosimetry program supports radiation-processing applications by assuring that the absorbed dose to the product, often prescribed or … more

Comparison of Co60 Absorbed Dose for High-Dose Dosimetry
Last Updated Date: 08/14/2015

NIST participated in a recent international comparison of standards for absorbed dose to water for 60 Co gamma radiation at radiation-processing … more

Dose/Dose-Rate Effects in Alanine Dosimetry
Last Updated Date: 08/14/2015

Check standards are used by the NIST Ionizing Radiation Division to monitor the performance of the alanine dosimetry system that is central to its … more

Traceability for Industrial Irradiator
Last Updated Date: 08/14/2015

U.S. manufacturers have contended for decades that traceability to national standards for industrial irradiation applications is best achieved by … more

Small-Field Therapy Dosimetry Using Alanine/EPR
Last Updated Date: 08/14/2015

Due to overlap with the Uniformed Services University of the Health Sciences (USUHS) in missions, scientific interests, expertise, and … more

X-ray Systems for Cargo and Vehicle Inspection Systems
Last Updated Date: 08/14/2015

The Dosimetry Group provides support to the Department of Homeland Security (DHS) in their evaluation of cargo and vehicle inspection systems. Our … more

Last Updated Date: 08/14/2015

Spectrophotometry is the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength. While … more

Photon and Charged Particle Data Center
Last Updated Date: 08/14/2015

The Photon and Charged Particle Data Center has long been an international source of photon and charged particle reference data that have been … more

Theoretical Dosimetry and Radiation-Transport Calculations
Last Updated Date: 08/14/2015

The fundamental photon and charged particle interaction data and the radiation transport methods, pioneered and developed at NIST to calculate the … more

Air Kerma Measurements in High Energy X-ray Beams
Last Updated Date: 08/14/2015

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

Magnetically Trapped Neutron Lifetime Experiment
Last Updated Date: 08/14/2015

The decay of the free neutron is the simplest nuclear beta decay and is the prototype for all charged current semi-leptonic weak interactions. The … more

Measurement of the Electron-Antineutrino Correlation in Neutron Decay (aCORN)
Last Updated Date: 08/14/2015

The angular correlation between the beta electron and antineutrino in nuclear beta decay a is the least well-known of the group of neutron decay … more

Neutron Lifetime Measurement Using a Cold Neutron Beam
Last Updated Date: 08/14/2015

Neutron beta-decay is the process in which a neutron is transformed into a proton, electron, and electron antineutrino. This process is well … more

Search for Time Reversal Violation in Polarized Neutron Decay (emiT)
Last Updated Date: 08/14/2015

The "emiT" experiment searched for time-reversal symmetry violation term in neutron beta decay. It did so by measuring electron-proton coincidence … more

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