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The Dosimetry Group maintains and disseminates the national measurement standards for air-kerma (exposure) from 137 Cs and 60 Co gamma-ray beams and for
Cargo-inspection systems employ high-energy x-ray beams from accelerators. These systems are designed to detect potential threats that may be present in cargo
The Alpha-Gamma device is a totally-absorbing neutron detector that has been used to measure the absolute neutron fluence of a cold, monoenergetic neutron beam
ZnO nanowires (NWs) are grown on bulk copper by chemical vapor deposition. Photoluminescence (PL) microscopy revealed band gap emission at 380 nm and a more
Atmospheric aerosol particles often have compositions and shapes that cannot be described as a single material phase within a simplified geometric form such as
This project develops STEM-in-SEM methods or low-energy transmission electron diffraction, imaging, and spectroscopy in the scanning electron microscope, to
The purpose of the N42 data format is to facilitate manufacturer-independent transfer of information from radiation measurement instruments for use in homeland
Antennas are the eyes, ears and voices of everything from cell phones to interplanetary spacecraft. The Antenna Metrology Program carries on PML's pioneering
In the early 1970s, NIST researchers pioneered the near-field scanning technique, now the standard method for testing high-performance antennas designed to
Antennas are the eyes, ears and voice boxes of everything from cell phones to interplanetary spacecraft. The Antenna Metrology Program carries on NIST's
Radiometric and photometric measurements require defining apertures. The accuracy to which these measurements can be accomplished requires minimization of the
Theory is being developed and used to devise methods for preserving and exploiting the quantum behavior of ever-larger systems for metrology, communication, and
Spectroradiometers are widely used for acquiring colorimetric, photometric, and radiometric quantities with a single measurement for a variety of applications
The National Institute of Standards and Technology operates two spectral comparator facilities, both of which are used to provide detector calibrations from the
The ASM Structural Materials Data Demonstration Project SMDDP) is a cooperative research project with the NIST Materials Measurement Laboratory (MML) that is
Due to their small size, nanoparticles can enter living organisms in previously unforeseen ways and their immense surface area results in higher reactivity
Atmospheric particles with long atmospheric lifetimes affect Earth's radiative balance. These particles typically consist of multiple chemical species. The
While it is a key aspect of structural analyses that support current Performance-Based Seismic Engineering (PBSE), "structural collapse" is not clearly defined
The use of thermal insulation is a primary approach to reducing heating and cooling loads in buildings, which account for 42 % and 24 % of energy consumption in