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Projects/Programs

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Organizational Unit

Basic Metrology (Archive): New Statistical Analysis Tools

Completed

Several new powerful analysis programs, based on specific requests and evaluations by the RG members, have been developed by the SED collaborators. These tools are now available on the internal NIST web site. It is intended that they will eventually be made available to the general public. The new

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 (Archive): Standardization of Am-243

Completed

The radionuclide 243Am decays by alpha emission and it is the most stable of the americium isotopes however, is not found in nature. It is formed in the nuclear fuel cycle by neutron capture on 242Pu followed by beta decay. It is used as a monitor for radioactive contamination and as a tracer on

Basic Metrology: Comparison of NIST-1 and NIST-3 Standard Ampoules

Ongoing

Exhaustive comparisons of the NIST-1 and NIST-3 ampoules are underway. Ion chamber evaluations have been completed for 99Mo, 133Ba, 241Am, 201Tl, and 67Ga. HPGe gamma-ray spectrometry evaluations have been completed for 99Mo, 133Ba, 241Am, 201Tl, and 67Ga. Many more evaluations are in the design /

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Basic Metrology: Design and Construction of a New Cs-137 Gamma-ray Calibration Facility

Completed

The new facility was built from the ground up, starting with an empty room, based on original design specifications developed by the Dosimetry Group at NIST. It is divided into two areas (control and irradiation) that are isolated from each other. The irradiation area contains a new 137Cs gamma-beam

Basic Metrology: Dose/Dose-Rate Effects in Alanine Dosimetry

Ongoing

Check standards are used by the NIST Radiation Physics Division to monitor the performance of the alanine dosimetry system which is central to its high-dose transfer dosimetry service. These measurements are performed to confirm the operational readiness of the calibration curve. Deviations from the

Basic Metrology: Gas Counting

Ongoing

Gas-filled detectors operate by measuring electrical current produced by radioactive particles interacting with an inert counting gas inside a volume. Depending on the applied voltage in the detector, different multiplication factors are achieved, which are used by specialized instruments such as

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

Basic Metrology: NIST-3 Standard Ampoules and Automatic Tip Sealing

Ongoing

Report NISTIR 8254 referenced above was intended to document and archive the historical record for the acquisition and testing of standardized ampoules used by the NIST / NBS Radioactivity Group since the 1950s. These ampoules were intended to contain 5 mL of solutions of radionuclides decaying with

Basic Metrology: Primary Standards for Radionuclides

Ongoing

As the National Metrology Institute (NMI) for the US, NIST is responsible for realizing the SI units. The derived SI unit for activity of a radionuclide is the becquerel, Bq. NIST has a proud history of contributing to the development of new and improved primary standardization methods for the Bq to

Basic Metrology: Recent Primary SRM Standardizations

Ongoing

SRM No. Radionuclide Reference Date Method Used Relative expanded uncertainty ( k = 2) References 4332f Americium-243 8 March 2024 The certified massic activity for 243Am was obtained by 4pab LS spectrometry with two commercial LS counters. The beta detection efficiencies for the 243Am daughter were

Basic Metrology: Remote Sensing Methods for Imaging Dose to Water

Ongoing

Ultrasound and laser interferometry, widely used for nondestructive testing and remote sensing applications, are being used here to measure dose distributions in irradiated water phantoms by taking advantage of temperature dependence in the speed of sound and optical index of refraction of water

photon attenuation cross section measurements

Basic Metrology: Standard Reference Data on Radiation Interactions

Ongoing

This work continues in the Division's Photon and Charged-Particle Data Center. The compilations of the Data Center rely heavily on evaluating measurements and on their synthesis with available theory to extend the data and provide for comprehensive coverage over broad ranges of energy and materials

Basic Metrology: Theoretical Dosimetry and Radiation-Transport Calculations

Ongoing

Monte Carlo simulation of radiation transport is an accurate tool for design, optimization and insight in situations both accessible and inaccessible to measurement. The Dosimetry Group applies these simulations to problems in radiation metrology, protection, therapy and processing. Our programs

Basic Metrology: True Becquerel - A New Paradigm for 21st Century Radioactivity Measurements

Ongoing

A diverse user community needs to both: identify radionuclides present in a material and quantify the massic activity (Bq/g) of each radionuclide, in a manner that’s traceable to the SI. At present, there is no method to achieve both objectives simultaneously for all types of decay. In many cases

EV Battery Passport

Completed

End-of-life issues associated with EV batteries (EVBs) are estimated to have a steep rise in the coming decades. Given the finite nature of material resources worldwide, developing a circular EV batteries (EVB) infrastructure is needed to keep high value battery materials in the economy, therefore

Bayesian Metrology Project

Ongoing

Research, develop, and apply Bayesian methods to the metrological problems of NIST; promulgate results to other metrology laboratories and to NIST customers. Four specific areas are targeted: traceability, interlaboratory comparisons, calibration, and part inspection. These areas were chosen because

5G & Beyond

Ongoing

The realization of this long-term vision requires tackling key technical challenges to allow for greater temporal, spectral, coding and spatial resource efficiency. As well, these technologies all rely on high levels of electronic device integration, yielding a radical new connectorless measurement

BIB-trap detector

Ongoing

Limitations of Standard BIB Detectors Currently available BIB detectors exhibit excellent detectivity, but are limited in their use for spectral calibrations by detection inefficiency and spectral response inhomogeneity. The maximum quantum efficiency of these doped silicon devices is near 60%

Bilateral Comparison of Spectral Responsivity in the Vacuum-Ultraviolet

Completed

The last decade has seen numerous key comparisons in the field of photometry and radiometry between different national metrology institutes (NMIs) in the context of the Mutual Recognition Arrangement. At first, these comparisons were restricted to wavelengths longer than 200 nm, with just the

Bioelectronic Sensors for Tissue/Organ-on-a-Chip Systems

Ongoing

We apply our expertise in micro/nanofabrication, electrokinetics and cell-based assays to develop bioelectronic sensors in microfluidic platforms. We are working on a platform that entraps cells for electrochemical monitoring in an environment that has mechanical properties more similar to those

Biofabrication of Tissue Engineered Constructs

Ongoing

OCT imaging was assessed using a model scaffold-cell system consisting of a polysaccharide-based hydrogel seeded with human Jurkat cells. Four test systems were used: hydrogel seeded with live cells, hydrogel seeded with heat-shocked or fixed dead cells and hydrogel without any cells. Time series

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--Agility and adaptability
--Collaborative robots
--Dexterous grasping
--Manipulation
--Mobility and industrial autonomous vehicles
--Navigation / actuation / control
--Sensing and perception
-Supply chain
-Sustainable manufacturing
-Systems engineering
-Systems integration
-Technology commercialization
Materials
-Ceramics
-Composites
-Concrete / cement
-Materials characterization
--Composition and structure
--Mechanical properties
--Thermal properties
-Metals
-Modeling and computational material science
-Polymers
-Superconductors
Mathematics and statistics
-Experiment design
-Image and signal processing
-Modeling and simulation research
-Numerical methods and software
-Statistical analysis
-Uncertainty quantification
Metrology
-Amount of substance
-Dimensional metrology
-Electrical / electromagnetic metrology
-Flow metrology and rheology
-Force metrology
-Humidity metrology
-Ionizing radiation metrology
-Mass metrology
-Metric
-Optical / photometry / laser metrology
-Pressure and vacuum metrology
-Thermometry metrology
-Time and frequency metrology
-Weights and measures
Nanotechnology
-Nanobiotechnology
-Nanochemistry
-Nanoelectronics
-Nanofabrication / manufacturing
--Lithography
--Self-assembly
-Nanofluidics
-Nanomagnetics
-Nanomaterials
-Nanomechanics
-Nanometrology
-Nanophotonics
-Nanophysics
-Nanoplasmonics
Neutron research
Performance excellence
-Assessment tools and services
-Baldrige award
-Baldrige examiners
-Baldrige Framework and Criteria
-Best practices
-Leadership development
Physics
-Atomic / molecular / quantum
-Biological physics
-Condensed matter
-Electron physics
-Magnetics
-Nuclear physics
-Optical physics and communications
-Quantum information science
-Radiation
-Spectroscopy
-Thermodynamics
-Time and frequency
Public safety
-Chemical / Biological / Radiological / Nuclear / Explosives (CBRNE)
-First responder preparedness
-Law enforcement
-Public safety communications research
-Response robots
Resilience
-Community resilience
--Recovery
--Resilience metrics
-Disaster and failure studies
-Earthquake risk reduction
-Resilience economics
-Resilient materials
-Windstorm impact reduction
Standards
-Accreditation
-Calibration services
-Conformity assessment
-Documentary standards
-Frameworks
-Quality assurance
-Reference data
-Reference instruments
-Reference materials
-Standards education
Technology transfer
Transportation
-Aerospace
-Automotive