Radiation

News and Updates

Cassie Stoffer smiles while wearing safety glasses and standing next to a large metal tank with many pipes and wires attached to it.

Spotlight: Cassie Stoffer Helps Run Calibration and Measurement Services Related to Magnetic Resonance

August 27, 2024

If you ask NIST physicist Cassie Stoffer what she finds most exciting about science, it’s seeing what she learned in a textbook have real-world applications

A high-tech laboratory with large black equipment featuring two circular insets showing detailed machinery setups. A computer workstation is in the foreground.

From Pandemics to Pedicures: NIST Rebuilds World-Class UV Calibration System

July 22, 2024

UV detectors need to be carefully calibrated to ensure that the UV light used is both safe and effective.

The Big Quantum Chill: NIST Scientists Modify Common Lab Refrigerator to Cool Faster With Less Energy

April 23, 2024

By modifying a refrigerator commonly used in both research and industry, researchers at the National Institute of Standards and Technology (NIST) have

Projects and Programs

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

Ultrafast Molecular Switch Dynamics Examined by Mid-Infrared Femtosecond Spectroscopy (Archived)

Completed

Examing dynamical properties of chemical species and materials often requires measurement over many orders of time. Since early time dynamics of molecular processes occurring on the femtosecond and picosecond timescales determines their subsequent photochemistry at later times. The goal of this

Imaging: Toward a Neutron Microscope

Ongoing

The NIST Neutron Microscope The NIST neutron microscope based Wolter optics represents a complete change in the way neutron imaging will be conducted, as the time and spatial resolution achievable with this instrument will approach that early generation X-ray synchrotron beamlines. A collaboration

Fundamental Physics: Search for Time Reversal Violation in Polarized Neutron Decay (emiT)

Completed

The stars and galaxies that make up our universe can only form if, during the initial moments after the Big Bang, there existed a slight dominance of matter over antimatter. It has been understood for some time that such an imbalance can only be explained if three conditions are met; a departure

Publications

System Vicarious Calibration requirements for satellite ocean colour missions targeting climate and global long-term operational applications

June 24, 2024

Author(s)

B. Carol Johnson, Giuseppe Zibordi, Ewa Kwiatkowska, Kenneth Voss, Frederic Melin, David Antoine, Menghua Wang, Shuguo Chen, Constant Mazeran, Brian Barnes, Jee-Eun Min

System Vicarious Calibration (SVC) is the technique that maximizes the accuracy of satellite ocean colour data products by minimizing the impact of inaccuracies

Early Electroscopes at the National Bureau of Standards

May 17, 2024

Author(s)

Bert Coursey, Brian E. Zimmerman, Michael G. Mitch, Paul Frame

This report describes the use of five electroscopes used as national standards for radioactivity for the United States during the early 20th century. This set

Benford's law in atomic spectra and opacity databases

April 21, 2024

Author(s)

Yuri Ralchenko, Jean-Christophe Pain

The intriguing law of anomalous numbers, also named Benford's law, states that the significant digits of data follow a logarithmic distribution favoring the

Activity standard and calibrations for 227Th with ingrowing progeny

April 20, 2024

Author(s)

Denis E. Bergeron, Jeffrey T. Cessna, Brittany Broder, Leticia Pibida, Ryan P. Fitzgerald, Morgan DiGiorgio, Elisa Napoli, Brian E. Zimmerman

Thorium-227 was separated from its progeny and standardized for activity by the triple-to-double coincidence ratio (TDCR) method of liquid scintillation

Tools and Instruments

Synchrotron Ultraviolet Radiation Facility SURF III

Awards

Brian Simonds, Kyle Rogers, Ivan Ryger, Joshua Hadler, Paul Williams, Alexandra Artusio-Glimpse, John Lehman, Nathan Tomlin, and Ari Feldman

R&D 100 Award - PhotoForce Project

For the development of a Radiation Pressure Power Meter that enables extremely high continuous laser powers to be measured as the force

Radiation

News and Updates

Spotlight: Cassie Stoffer Helps Run Calibration and Measurement Services Related to Magnetic Resonance

From Pandemics to Pedicures: NIST Rebuilds World-Class UV Calibration System

The Big Quantum Chill: NIST Scientists Modify Common Lab Refrigerator to Cool Faster With Less Energy

Projects and Programs

Carrier Dynamics Measured by Ultrafast Time-Resolved Terahertz Spectroscopy

Ultrafast Molecular Switch Dynamics Examined by Mid-Infrared Femtosecond Spectroscopy (Archived)

Imaging: Toward a Neutron Microscope

Fundamental Physics: Search for Time Reversal Violation in Polarized Neutron Decay (emiT)

Publications

System Vicarious Calibration requirements for satellite ocean colour missions targeting climate and global long-term operational applications

Early Electroscopes at the National Bureau of Standards

Benford's law in atomic spectra and opacity databases

Activity standard and calibrations for 227Th with ingrowing progeny

Tools and Instruments

Synchrotron Ultraviolet Radiation Facility SURF III

Radiopharmaceutical Standardization Laboratory

Instrument Testing for Radiation Detection Systems

The Parallel Beam Diffractometer (PBD) Laboratory

Awards

R&D 100 Award - PhotoForce Project