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Physics

Radiation

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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

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: 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: 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 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 Services: Proficiency Tests for X-Ray Air Kerma within the Quality System

Ongoing

To meet the needs of US calibration facilities which maintain traceability to NIST for air kerma measuring instruments, NIST offers proficiency tests upon request. NIST will conduct a proficiency test as part of an accreditation program or on an individual basis with a calibration facility. NIST

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: Calibrating a secondary standard ionization chamber for photon-emitting radionuclides in ISO 10R vials

Ongoing

Because sealed borosilicate glass ampoules preserve samples well, NIST has relied upon them for calibrations and long-term storage of samples and reference materials. Feedback from customers has suggested that they experience difficulty with the techniques used to seal and open these ampoules. They

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

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

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

Carrier Dynamics Measured by Ultrafast Time-Resolved Terahertz Spectroscopy

Ongoing

We employ ultrafast pulsed optical measurement techniques to directly monitor carrier generation, migration and relaxation dynamics in bulk semiconductors, polymers and mixed organic/organometallic photovoltaic nanofilms. These studies are conducted to measure (without contact) ultrafast carrier

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