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Physics Programs & Projects

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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

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

A Precision Reactor Antineutrino Oscillation and Spectrum Measurement (PROSPECT)
Last Updated Date: 08/14/2015

PROSPECT, the PRecision Oscillation and SPECTrum experiment, located at the High Flux Isotope Reactor (HFIR) at ORNL will measure the … more

Pico-Watt ACR
Last Updated Date: 08/14/2015

The goal of the Pico-Watt ACR project (pW-ACR) is to develop an absolute cryogenic radiometer (ACR) able to calibrate 1 pW of optical power with … more

BIB-trap detector
Last Updated Date: 08/14/2015

The goal of the BIB-Trap Detector project is to develop a detector composed of solid-state devices that can be used as a reference detector for … more

Transfer radiometers and reference detectors
Last Updated Date: 08/14/2015

We have developed several portable radiometers to transfer the primary detector-based scales for optical power, radiance, and irradiance in the … more

Absolute cryogenic infrared radiometry at the LBIR facility
Last Updated Date: 08/14/2015

In support of defense programs in remote sensing, NIST maintains the scale for infrared radiant flux by using an Absolute Cryogenic radiometer … more

Testing of Radiation Detection Systems
Last Updated Date: 08/12/2015

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

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