Ionizing radiation metrology

News and Updates

19th International Workshop on Low Temperature Detectors (LTD19)

July 29, 2021

The 19th International Workshop on Low Temperature Detectors (LTD19) was an opportunity for researchers from around the world to exchange information about the

EBIT’s Improved X-ray Vision Promises Astronomical Insights

April 25, 2019

Look at an astronomical marvel like the Cat’s Eye Nebula at right, with an average gas temperature about twice as hot as the surface of the Sun. It seems

Photonic Radiation Sensors Survive Huge Doses Undamaged

November 27, 2018

Researchers at the National Institute of Standards and Technology (NIST) have published landmark test results that suggest a promising class of sensors can be

Projects and Programs

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 that is central to its high-dose

Multiscale structure and dynamics in advanced technological materials

Ongoing

This project develops and applies metrologies and standards for characterizing microstructure and dynamics in advanced functional materials of technological

Basic Metrology: Theoretical Dosimetry and Radiation-Transport Calculations

Ongoing

The fundamental photon and charged particle interaction data and the radiation transport methods, pioneered and developed at NIST to calculate the penetration

Photonic Dosimetry

Ongoing

As part of the NIST on a Chip program, the Photonic Dosimetry project is developing in-situ sub-micrometer ionizing-radiation dosimetry and calorimetry leading

Publications

Primary standardization of 212Pb activity by liquid scintillation counting

September 22, 2022

Author(s)

Denis E. Bergeron, Jeffrey T. Cessna, Ryan P. Fitzgerald, Lizbeth Laureano-Perez, Leticia Pibida, Brian E. Zimmerman

An activity standard for 212Pb in equilibrium with its progeny was realized, based on triple-to-double coincidence ratio (TDCR) liquid scintillation (LS)

Energy calibration of nonlinear sensors with uncertainty estimates from Gaussian Process Regression

August 22, 2022

Author(s)

Joseph Fowler, Bradley Alpert, Galen O'Neil, Daniel Swetz, Joel Ullom

The nonlinear energy response of cryogenic x-ray microcalorimeters is usually corrected though an empirical calibration. Certain x-ray emission lines of known

Fabrication of a fractal pattern device for focus characterizations of X-ray imaging systems by DRIE and Bottom-up Au Electroplating

April 26, 2022

Author(s)

Daniel Josell, Thomas P. Moffat

Precisely aligned optical components are crucial prerequisites for X-ray tomography at high resolution. We propose a device with a fractal pattern for precise

Toward a New Primary Standardization of Radionuclide Massic Activity Using Microcalorimetry and Quantitative Milligram-Scale Samples

February 24, 2022

Author(s)

Ryan P. Fitzgerald, Bradley Alpert, Dan Becker, Denis E. Bergeron, Richard Essex, Kelsey Morgan, Svetlana Nour, Galen O'Neil, Dan Schmidt, Gordon A. Shaw, Daniel Swetz, R. Michael Verkouteren, Daikang Yan

We present a new paradigm for the primary standardization of radionuclide activity per mass of solution (Bq/g). Two key enabling capabilities are 4π decay

Tools and Instruments

X-ray Backscatter Systems

X-ray backscatter systems are used for the screening of personnel for hidden weapons and other contraband. Unlike conventional radiographic x-ray systems