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Radiation Physics Programs & Projects

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Towards a Neutron Microscope
Last Updated Date: 07/23/2013

A novel neutron lens based on reflection has recently been developed that could greatly benefit neutron imaging and other neutron scattering … more

Pushing and Understanding the Limits of Spin-Exchange Optical Pumping of He-3
Last Updated Date: 07/23/2013

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

Precision Measurement of Radiative Neutron Decay Branching Ratio and Energy Spectrum
Last Updated Date: 07/23/2013

Although neutron decay is typically considered as a three-body process, in the radiative correction it is always accompanied by … more

Neutron Imaging for Advanced Catalyst Development and Durability Studies
Last Updated Date: 07/22/2013

Neutron imaging continues to play a key role in elucidating the role of water in proton exchange membrane fuel cells (PEMFCs) as highlighted by … more

Measurement of the Electron-Antineutrino Correlation in Neutron Decay
Last Updated Date: 07/22/2013

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

Magnetically Trapped Neutron Lifetime Experiment
Last Updated Date: 07/22/2013

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

High-Efficiency Neutron Detection and Spectroscopy
Last Updated Date: 07/22/2013

Precise knowledge of the fast neutron spectrum and fluencies is essential for several experimental endeavors requiring the low-background of the … more

Alpha-gamma Counting for High Accuracy Fluence Measurements
Last Updated Date: 07/22/2013

Neutron fluence is measured by counting gamma-rays from the reaction n+ 10 B® 4 He+ 7 Li + g(478KeV) with a calibrated gamma detector. The gamma … more

IECn42
Last Updated Date: 06/05/2013

The purpose of the IEC 62755 standard N42 data format is to facilitate manufacturer-independent transfer of information from radiation measurement … more

High-Dose Dosimetry Uncertainty Tables
Last Updated Date: 04/02/2013

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

Calibration of Beta-Particle Sources and Instruments for Radiation Protection
Last Updated Date: 03/21/2013

A calibration service for protection-level beta-particle sources and instrumentation has been in place at NIST for several years

Absorbed-Dose Measurements to Support Biologics Research
Last Updated Date: 03/20/2013

The Dosimetry Group have been working with Maryland-based biotech firm Sanaria Inc. that is planning to manufacture a new vaccine against malaria. more

Radionuclides by Anticoincidence Counting
Last Updated Date: 03/20/2013

The standardization of radionuclides by primary methods is the foundation for all the standards and services provided by the NIST radioactivity … more

Liquid Scintillation Counting
Last Updated Date: 03/19/2013

The triple-to-double coincidence ratio (TDCR) method of liquid scintillation counting employs three detectors to facilitate the experimental … more

Ge-68, PET Scanner Clinical Trials
Last Updated Date: 03/19/2013

The interpretation of quantitative imaging data obtained from Positron Emission Tomography (PET) studies requires an understanding of the … more

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