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Projects/Programs

Topic Area
Displaying 176 - 200 of 1616

Calibration Services: High-Dose Dosimetry

Ongoing
NIST developed the alanine dosimetry system in the early 1990's to replace radiochromic dye film dosimeters. Later in the decade the alanine system was firmly established as a transfer service for high-dose radiation dosimetry and an integral part of the internal calibration scheme supporting these

Calibration Services: Low-Energy Photon Brachytherapy Sources

Ongoing
Since 1999, over 1,500 seeds of more than 40 different designs from 18 manufacturers have been calibrated using the WAFAC. On-site characterization at seed manufacturing plants for quality control, as well as at therapy clinics for treatment planning, relies on well-ionization chamber measurements

Calibration Services: New Calibration Facility for X-Ray Air Kerma

Ongoing
The NIST x-ray calibration facility is composed of a suite of rooms that includes the 11 m by 7 m calibration range, a dedicated equipment room, connected by custom shielding ports for communication with the x-ray tubes in the radiation area, an operator control center with a viewing window and

Calibration of Space Weather Observational Instruments at NIST

Ongoing
Space-weather events are naturally occurring phenomena caused by activity on the Sun that affect us here on Earth. Solar storms can impact technology we rely on daily, like e.g. the Global Positioning System (GPS), communication satellites, and electric power grids. Various phenomena that originate

Calibrations: Californium Neutron Irradiation Facility

Ongoing
A high-activity Cf-252 source (~10 10 neutrons/s as of May 2024) is housed in a large (approximately 15 m x 10 m x 10 m high) room with concrete walls, floor, and ceiling (see photograph) at a depth of 10 meters-water-equivalent. In addition, there are two monoenergetic neutron generators for 2.5

Calibrations: Neutron Device Calibrations

Ongoing
The Neutron Physics Group calibrates neutron radiation detectors used for personnel protection and irradiates personnel dosimeters in standard neutron fields. The fields are produced by unmoderated 252Cf and 252Cf moderated with a D 2O sphere (represented by the gray sphere near the center of the

Calibrations: Neutron Source Strength

Ongoing
Calibrations are performed using the manganous sulfate bath technique in which the emission rate of the source to be calibrated is compared to the emission rate of NBS–1, the national standard Ra–Be photo-neutron source. Neutron source calibrations typically have a relative expanded uncertainty ( k

Calibrations: Portable Manganese Sulfate Bath

Ongoing
The Manganese Sulfate Bath uses a sphere of neutron-absorbing material that surrounds a neutron source. The induced radioactivity is a measure of the neutron source strength. Lower intensity sources provide less manganese activation, resulting in a reduced signal over background, and this signal-to

Calibrations: Radioactivity Standard Reference Material Program

Ongoing
NIST radioactivity SRMs represent the national basis for accurate radioactivity measurements. SRMs for radioactivity measurements can typically be classified into three general categories: (1) environment and nuclear power, (2) medicine, and (3) basic and applied research using or involving

Cancer Biomarker Measurements and Collaborations

Ongoing
Collaborations and Cooperative Research Agreements We welcome collaborations and can help with assay validation and development of reference materials. Below are some examples of our collaborations and ways we can develop test materials. Early Detection Research Network (EDRN): Interagency agreement

Cancer Genome in a Bottle

Ongoing
Goals: This project is an extension of the Genome in a Bottle Consortium to develop the technical infrastructure (reference standards, reference methods, and reference data) to enable translation of cancer genome sequencing to clinical practice and innovations in technologies. The priority of GIAB

Carbon Dioxide Measurements and Reference Materials

Ongoing
CO 2 Reference Materials The Gas Sensing Metrology Group at NIST has a long history of providing reference materials to industry, monitoring communities, and academia. The program began in the 1970’s by developing an initial suite of CO2 primary standard mixtures (PSMs) to support the US Department

Carbon Nanotube Reference Materials

Completed
Carbon nanomaterials are expected to play an important role in future technological developments of transistors, photovoltaics, transparent thin film conductors, sensors, and fuel cell electrodes among many potential applications. However, the potential of these materials has been hindered by a lack

Carbon Removal, Capture, Use, and Sequestration

Ongoing
NIST develops benchmark materials, measurements, data, and models to accelerate innovation in and validate performance of materials and technologies for the capture of carbon from air and sequestration in building materials.

Cardiac Device Reliability

Ongoing
Impact and Customers This project will reduce the need for surgeries to replace failed implants, thereby improving safety and quality of life for implant recipients and reducing medical expense to society. It will provide assessment tools for the external electronic devices that support the

CBRS Sharing Ecosystem Assessment

Ongoing
Background: In 2020, FCC auction 105 auctioned licenses in the Citizens Broadband Radio Service (CBRS). CBRS (3.55 GHz to 3.7 GHz) has a three-tiered framework to accommodate shared federal and non-federal use of the band. The DoD 3.5 GHz Transition Plans focus on ecosystem validations

CCQM Activities in the Gas Analysis Working Group

Ongoing
The results from these Key comparisons will be used to benchmark the appropriate Calibration and Measurement Claims (CMCs) of the participating NMIs. CMCs are basically the declared capabilities that an NMI offers to customers, and they are included in a searchable database at the BIPM web site