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Radiation Physics Programs & Projects

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Quantum Sensors
Last Updated Date: 07/29/2015

The Quantum Sensors Project develops sensors based on quantum phenomena for spectroscopy, imaging, and other precision measurements for … more

Electron-Beam Irradiation of Solar Cells
Last Updated Date: 07/29/2015

The Dosimetry Group operates a system capable of performing electron beam processing, which consists of a Van de Graaff electron accelerator and a … more

Alpha-gamma Counting for High Accuracy Fluence Measurement
Last Updated Date: 07/28/2015

The Alpha-Gamma device is a totally-absorbing neutron detector that has been used to measure the absolute neutron fluence of a cold, monoenergetic … more

New Manganese Sulfate Bath
Last Updated Date: 07/27/2015

Many neutron sources required by Homeland Security have a lower neutron emission rate than is appropriate for the NIST calibration facility, a … more

Precision Measurement of the Neutron-He3 Incoherent Scattering Length
Last Updated Date: 07/27/2015

The Neutron Interferometer and Optics Facility performed a precision measurement of the n- 3 He incoherent scattering length using a polarized 3 … more

Use of Quantum Error Coding in a 4-Blade Neutron Interferometer
Last Updated Date: 07/27/2015

We have designed a new type of neutron interferometer, which will be less sensitive to slow vibrations.

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

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