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Projects/Programs

Displaying 1 - 25 of 165

Aberration-corrected scanning transmission electron microscopy

Ongoing
As devices continue to become smaller, more complex, and more highly integrated, atomic scale measurements of their structure, chemistry, strain, and electric field are increasingly crucial for device design, reliability, and optimization. The aberration-corrected scanning transmission electron

Advanced Microscopy for Trace and Bulk Particle Characterization

Ongoing
The goal of this project is to help develop innovative metrologies and measurement protocols for micro/nano-scale analysis of particles. In this project, state-of-the-art optical and electron-based microscopy are used to conduct research for quantitative and qualitative analysis of chemical

Applications of Quantum Information

Ongoing
Human-scale physical phenomenon represent the emergent, complex behavior of simple, microscopic laws. In the past twenty years, improved understanding of these microscopic laws have suggested that typical large-scale systems — those used in modern day technology from transistors to mechanical

Applied: Methods in Neutron Detection and Spectroscopy

Completed
Energetic neutrons (> 1 MeV) play a variety of important roles from dosimetry to the fundamental sciences. Fast neutrons can be an often under-appreciated but significant biological dose from accelerators and nuclear facilities, serve as a way of detecting nuclear materials, and can often yield

Applied: Wide-Angle Neutron Polarization Analysis

Ongoing
We have developed a polarizer-analyzer-spin flipper system based solely on 3He spin filters on the Multi-Axis Crystal Spectrometer (MACS) at the NIST Center for Neutron Research. The compact system is housed by a 36 cm diameter, vertical solenoid. Neutrons are polarized by transmission through a

Atomic Spectroscopy Data Center

Ongoing
The Atomic Spectroscopic Data Center at NIST provides the most comprehensive collection of atomic spectroscopy data in the world. We monitor scientific literature and maintain bibliographic databases of all papers containing spectroscopic data. By evaluating and compiling data on energy levels

Atomic Wavefunctions

Ongoing
The numerical solution of the multi-particle Schrodinger equation describing atomic systems remains a challenging for computational physics. ITL scientists are in the forefront of this field with respect to extremely high-accuracy computation of non-relativistic eigenstates of few electron systems.

Basic Metrology: Applications of Diagnostic X-ray Spectrometers

Ongoing
These have been fielded to help characterize the performance and x-ray spectra from advanced medical x-ray sources, laser-produced plasmas, terawatt pulsed accelerators, electron cyclotron resonance ion sources, electron-beam ion traps, intense ultrafast laser sources, and inverse-Compton

Basic Metrology (Archive): Fit-for-purpose liquid scintillators

Completed
It is now common to use surfactants to entrain aqueous metal salts in organic scintillators. This is crucial for radioactivity measurements because most radionuclides of interest are metals. More, non-metal radionuclides encountered in the environment or in medicine are nearly always in aqueous form

Basic Metrology (Archive): Primary Radioactivity Standardization of Ni-63

Completed
Generally, 63Ni has great utility as a low-energy β - calibration standard because of the favorable combination of long half-life (T = 100 a) and β - endpoint energy. Primary standardizations of 63Ni have been actively pursued by national radionuclidic metrology laboratories for over 40 years. As a

Basic Metrology (Archive): Radon Binding to Water-Soluble Cryptophane

Completed
In collaboration with the University of Pennsylvania, a 222Rn emanation sources, similar to the NIST 222Rn emanation standard (SRM 4968, NIST, 1996) was found to have a unique and novel application in a radon-in-water generator for the determination of the binding affinity of radon to a cryptophane

Basic Metrology: High-Dose Dosimetry Uncertainty Tables

Ongoing
Gammacell™ Calibration Geometry Dose Rate Uncertainty Source Type A (%) Type B (%) Water Calorimetry in Vertical Beam 0.16 0.51 Gammacell/Pool Source Ratio Data 0.10 Pool/B036 Source Ratio Data 0.17 Geometry Correction Factor 0.11 Field Uniformity 0.01 Source Timer (irrad time > 8min) 0.20 Co-60

Basic Metrology: High-Resolution X-Ray Spectroscopy

Ongoing
X-ray sources of interest include Electron Beam Ion Trap (EBIT), Electron Cyclotron Resonance Ion Source (ECRIS), and laser-produced plasma ion sources, including the new generation of petawatt lasers. In support of these efforts, we also maintain laboratory x-ray sources from 1 keV to 300 keV

Basic Metrology: Neutron Cross Section Standards

Ongoing
Data from a number of NIST collaborations have produced measurements for the standards program. Measurements are underway now at NIST of the 6Li(n,t) and 235U(n,f) cross sections at sub-thermal energy. These will be the first absolute measurements of these cross sections in this energy region. These