Ionizing radiation metrology

News and Updates

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

Getting the Inside Story on Products with Computed Tomography

February 22, 2017

It is often the case that a valuable new industrial capability brings with it a whole new set of challenges for measurement science -- and thus, inevitably, for

Seeing Light’s Effect on Atoms — Within Picoseconds

November 16, 2016

For the first time in a laboratory setting, NIST scientists have made stop-action x-ray measurements of the way visible light interacts with atoms and molecules

Projects and Programs

Theoretical Dosimetry and Radiation-Transport Calculations

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

Photonic Dosimetry

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

Small-field Therapy Dosimetry Studies Using Alanine/EPR

Due to overlap with the Uniformed Services University of the Health Sciences (USUHS) in missions, scientific interests, expertise, and instrumental requirements

Radioanalytical Metrology

Publications

The Next Generation of Current Measurement for Ionization Chambers

September 1, 2020

Author(s)

Ryan P. Fitzgerald, Denis E. Bergeron, Dean G. Jarrett, Neil M. Zimmerman, Carine Michotte, Hansjoerg Scherer, Stephen Giblin, Steven Judge

Re-entrant ionization chambers (ICs) are essential to radionuclide metrology and nuclear medicine for maintaining standards and measuring half-lives. Metrology

Radionuclide calibrator responses for 224Ra in solution and adsorbed on calcium carbonate microparticles

June 12, 2020

Author(s)

Denis E. Bergeron, Elisa Napoli, Jeffrey T. Cessna, Leticia S. Pibida, Ryan P. Fitzgerald, Gro Hjellum

A suspension of 224Ra adsorbed onto CaCO3 microparticles shows promise for localized internal α‐therapy of intracavitary micro-metastatic diseases, i.e

Accurate Integral Counting Using Multi-channel Analyzers

May 1, 2020

Author(s)

Ryan P. Fitzgerald, Lynne E. King

Many techniques in radionuclide metrology rely on accurate measurement of the total count rate, that is integral counting, from a detector. In modern

Radiation damage of liquid electrolyte during focused X-ray beam photoelectron spectroscopy

April 12, 2020

Author(s)

Christopher M. Arble, Hongxuan Gou, Evgheni Strelcov, Brian D. Hoskins, Patrick Zeller, Matteo Amati, Luca Gregoratti, Andrei A. Kolmakov

Ambient pressure X-ray photoelectron spectroscopy (APXPS) has become an effective tool to interrogate chemical states at surfaces relevant to real operational

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