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Physics Programs & Projects

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Calibration of Epoxy Based Ba-133 Standard Phantom Sources for Use in an International Comparison for Quantitative SPECT
Last Updated Date: 08/12/2015

The International Atomic Energy Agency (IAEA) recently initiated a Cooperative Research Project (CRP) entitled “Development of Quantitative … more

Calibrations of Large-Volume, Solid Ge-68 Phantom Sources for Monitoring PET Scanner Performance in Clinical Trials
Last Updated Date: 08/12/2015

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

Automated Multi-Sample Ionization Chamber for Radioactivity Standards
Last Updated Date: 08/12/2015

Precise calibration of short-lived radioactive material is essential for nuclear medicine and power plant applications. Scientists in the NIST … more

Primary Standardization of Radionuclides by Anticoincidence Counting
Last Updated Date: 08/12/2015

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

NIST Laboratory for Quantitative PET-CT Imaging
Last Updated Date: 08/12/2015

As part of a NIST-wide effort to develop a metrological infrastructure for quantitative medical imaging, the Radioactivity Group established a … more

Terahertz Bi-Directional Reflection Function Measurements and Imaging for Homeland Security
Last Updated Date: 08/11/2015

Far-infrared (or THz, 25 to 300 micron wavelength) femtosecond laser methods are employed to generate high power (ca. 1 µJ) broadband pulses for … more

Hydrogen Generation in Di-Iron Hydrogenase Mimics
Last Updated Date: 08/11/2015

Discovery of novel materials to facilitate hydrogen gas production has prompted new avenues of research towards developing hydrogen as an … more

Dosimetry Standardization for Radiobiology
Last Updated Date: 08/10/2015

A program for the development of dosimetry standards for radiobiology was launched through a highly successful workshop. The … more

Far-infrared Spectroscopy of Biomolecules
Last Updated Date: 08/10/2015

Far-infrared (or terahertz/THz, ca. 25 to 300 micron wavelength) femtosecond pulsed laser and Fourier-transform infrared methods are employed to … more

Advanced Linear and Nonlinear Optical Properties of Materials
Last Updated Date: 08/06/2015

High-accuracy linear and nonlinear optical properties of materials used for leading-edge optical technologies are measured and characterized to … more

Comparison of ANSI N42.46 and IEC 62523 Standards for Cargo and Vehicle Screening
Last Updated Date: 08/06/2015

We are undertaking a comparison of the relative performance of ANSI N42.46 and IEC 62523 consensus standards for x-ray cargo and vehicle … more

Measurement of the Parity Non-Conserving Neutron Spin Rotation in Liquid Helium
Last Updated Date: 08/06/2015

The Standard Model has been remarkably successful in describing weak interactions between leptons, leptons and hadrons, and in flavor-changing … more

Methods in Neutron Detection and Spectroscopy
Last Updated Date: 08/06/2015

We continue to work improving techniques in fast neutron detection using segmented spectrometers based on the principle of capture-gating. Our … more

Precision Measurement of the Neutron-He3 Incoherent Scattering Length
Last Updated Date: 08/06/2015

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

Measurement of the Neutron Magnetic Dipole Moment Using Schwinger Scattering
Last Updated Date: 08/06/2015

This experiment will measure the neutron interaction with an atomic field (also known as Schwinger scattering) inside a silicon crystal in order … more

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