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Physics

Projects/Programs

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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

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

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

Birefringence Properties of Optical Materials (0.12 μm – 2 μm)

Ongoing

For crystals with non-cubic crystal symmetry, we make accurate measurements of the birefringence and its wavelength dispersion (0.12 μm – 15 μm) by separate index measurements of the two polarizations using the NISTs minimum deviation refractometry system. In nominally isotropic materials (cubic

Boulder Microfabrication Facility

Ongoing

The Boulder Microfabrication Facility (BMF) is a 1700 m 2 (18,000 ft 2), ISO class 5 (class 100) clean room dedicated to providing state-of-the-art micro- and nano-fabrication capabilities to meet the microelectronic and microelectromechanical systems needs of NIST-Boulder staff members and their

Calibration of the Extreme UV/X-ray Irradiance Sensor (EXIS) for the Geostationary Operations Environment Satellite R-Series Program (GOES-R)

Ongoing

The EXIS instrument detects solar soft X-ray irradiance (XRS) and solar extreme ultraviolet (EUVS) spectral irradiance. XRS helps predict proton events and monitors solar flares that can disrupt communications and degrade navigational accuracy. EUVS monitors solar variations that directly affect

Calibration Service: Absorbed Dose to Water and Air Kerma Calibration in Co60 Therapy Level Gamma Ray Beams

Ongoing

Measurements provided by these accredited dosimetry calibration laboratories (ADCLs) are directly traceable to the national standard for absorbed dose to water and air kerma from 60Co therapy level gamma ray beams held at NIST. This is achieved by the use of high quality ionization chambers that are

Calibration Service: Air-Kerma Calibrations in Radiation Protection Level Cs-137 and Co-60 Gamma Ray Beams

Ongoing

The national standard for air kerma is disseminated throughout the U.S. by way of a network of secondary calibration facilities that in turn calibrate radiation detection instruments such as ionization chambers, survey meters, electronic personal dosimeters (EPDs), thermoluminescent dosimeters (TLDs

Calibration Services: Beta-Particle Sources and Instruments for Radiation Protection

Ongoing

The NIST facility for carrying out beta-particle measurements for radiation-protection purposes consists of: a second-generation beta-particle secondary standard system (BSS2) which includes a set of well-characterized beta-particle sources (Sr-90, Kr-85) covering a wide energy and dose-rate range

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: National Air-Kerma Standard for Electronic Brachytherapy

Ongoing

The increased use of limited-lifetime electronic brachytherapy sources which are miniature, low-energy x-ray tubes for clinical applications resulted in the need of a measurement of air-kerma dose from NIST. The type of electronic brachytherapy sources, Axxent S700, used at NIST operates at tube

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: Ionization Chambers as Secondary Standards for Activity of Radionuclides

Ongoing

NIST maintains multiple ionization chambers to support heavily subscribed user demand for measurement assurance programs and calibrations and for ongoing research and development. The ionization chamber “A” maintains historic calibration factors for more than 70 radionuclides making it valuable both

Electron and Photon Absrobed-Dose-to-Water

Calibrations: Water Calorimetry Primary Standards for Absorbed Dose to Water

Ongoing

While NIST maintains the original standard for use in Co-60, preliminary work has been done to commission a standard for use in high-energy x-ray beams from the NIST medical linear accelerator (Varian Clinac 2100C). Completion of this task will enable NIST to provide direct calibrations in 6 MV and

Chip-scale ultraprecise laser technologies

Ongoing

Lasers with high spectral purity are used in a diverse application space, including coherent high-speed communications, physical sensing, and manipulation of quantum systems. Lab bench scale Fabry-Perot cavities based on sophisticated vibration, thermal, and atmospheric isolation have made possible

CODATA values of the fundamental physical constants

Ongoing

CODATA recommended values of the constants Database of references for data on the constants Publications: Reviews of Modern Physics ( 1998) ( 2002) ( 2006) ( 2010) ( 2014) Journal of Physical and Chemical Reference Data ( 1998) ( 2006) ( 2010) Resource Letter FC-1: The physics of fundamental

Cold-atom-based sensor for measuring pressure in the ultra-high vacuum domain

Ongoing

Measuring pressure in an ultra-high vacuum (UHV) environment is a challenging task. Direct measurement of the force generated by collisions of the residual or background atoms and molecules on a unit area of the vacuum chamber, typically held at or near room temperature, is not feasible. The force

Compact strontium optical clock with integrated photonics

Ongoing

The development of a liter-scale apparatus to produce Sr, would enable highly accurate, transportable optical clocks based on their ultra-narrow optical transition. However, straightforward miniaturization of the traditional optical infrastructure necessary to implement multi-step laser cooling has

Compact Ultrastable Optical References

Ongoing

At the heart of any stable laser is a reference cavity resonator. By locking a laser’s frequency to a reference cavity mode, the laser inherits the resonator’s stability. These stable lasers can then be used in various sensing and spectroscopy applications, including in optical atomic clocks and

Comparison of Synchrotron Radiation-Based Ultraviolet Source Calibrations at PTB and NIST

Completed

Because of the ever increasing interest into ultraviolet radiation and its properties, National Measurement Laboratories like the PTB and NIST are providing ultraviolet source and detector transfer standards and related services. In addition not only the absolute calibration of transfer standards is

Comparisons (Archive): International Comparison of Tc-99 Activity

Completed

Measurements by NIST on the solution were performed by three methods: viz., liquid scintillation (LS) standardizations (with 3H-standard efficiency tracing); with triple-to-double-coincidence ratio (TDCR) method; and with by 4ηβ(LS)-γ(NaI) live-timed anticoincidence (LTAC) measurements. Impurities

Comparisons (Archive): International Comparison of Pu-241 Activity

Completed

Quantitation of 241Pu in low-level waste and environmental samples is of interest because 241Pu is a precursor of other transuranium nuclides that have longer half-lives, greater environmental mobility, and greater toxicity. In addition, 241Pu is the most difficult of the plutonium isotopes to

Comparisons: Key Comparison for Air-Kerma From Therapy Level and Radiation Protection Gamma-ray Beams

Completed

In support of the Mutual Recognition Arrangement of the International Committee for Weights and Measures (CIPM MRA), the Dosimetry Group of the Radiation Physics Division, PML has recently completed two key comparisons with the BIPM for therapy and radiation protection gamma-ray beams for the

Controlling collisions between laser-cooled atoms using magnetic fields and nano-eV colliders

Ongoing

Understanding collisions between atoms is important to many research efforts at NIST. Atomic clocks based on cesium or rubidium atoms at microkelvin temperatures, for example, are measurably affected by atom-atom collisions. So much so that in a candidate next-generation atomic clock, now based on

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