Explanipedia

Correlated Signal Analysis for Nuclear Emergency Response Open

Jesus Fernando Perello Izaguirre, Tony H. Shin, Theresa Cutler, David Mercer · 2024

In the context of nuclear emergency response (NER) scenarios, the critical task is to quickly identify a "black box" as a potential threat, as failing to do so could have catastrophic consequences. Techniques for passive assay of a “black …

Experimental Validation of NDA Capabilities for MSR Safeguards: First Results Open

Matthew H. Carpenter, Mark Croce, K. Koehler, Krystel Iris Medrano de Castro, David Mercer , et al. · 2024

Testing Binomial Division Open

David Mercer, Thomas Burr, Steven K. Croft, John M. Kirkpatrick, Athena Sagadevan , et al. · 2024

Interpretation of gamma ray spectra and adjudication of radiation alarms Open

David Mercer, George P Lasche, Daniel D Dietrich · 2024

Recent onsite gamma measurements at the trinity test site and a comparison to trinitite samples Open

Philip Hypes, David Mercer, Paul Seay · 2024

Recent onsite gamma measurements at the Trinite test site and a comparison to trinitite samples Open

David Mercer, Philip Hypes, Paul R. J. Saey · 2024

TGS measurements of pyrochemical salts at Rocky Flats Open

David Mercer, J. S. Hansen, J. P. Lestone, T. H. Prettyman · 2024

A new skid-mounted tomographic gamma scanner (TGS) was designed to assist in the decommissioning of Rocky Flats Building 37 1, This instrument was used to assay pyrochemical salts as a prerequisite for disposal at the Waste Isolation Pilot…

The Origin of Gamma Rays Open

Jacob Stinnett, Peter Karpius, David Mercer, T.D. Reilly, Duc Vo · 2024

This chapter presents the production mechanism for gamma rays and X rays that are important in nondestructive assay measurements of nuclear materials. Characteristics of nuclear decay processes that produce gamma rays are presented. Typica…

Gamma-Ray NDA Applications & Techniques Open

Peter A. Santi, Rachel Hunneke, Bruce Jennings, Peter Karpius, Angela L Lousteau , et al. · 2024

This chapter describes various gamma-ray measurement techniques that are used to perform nondestructive assay of nuclear material for nuclear safeguards and nuclear security purposes. Specifically, this chapter focuses on techniques that c…

Attenuation Correction Procedures Open

David Mercer, Peter Karpius, J.L. Parker, Peter A. Santi, K. Schmidt · 2024

Nuclear materials subject to nondestructive assay (NDA) are often macroscopic objects composed of highly attenuating material. In some situations, the objects under assay are also obscured by containers or shielding. Gamma rays emitted wit…

Gamma-Ray Detectors Open

M. Lombardi, Matthew H. Carpenter, David Mercer, Paolo Russo, Duc Vo · 2024

This chapter describes gamma-ray detectors, including gas-filled, scintillation, solid-state, and microcalorimeter, that can be used for measuring gamma rays from nuclear materials. A comparison of detector types is presented. The characte…

DOE Radiological Triage Program: Analyst Open Book Exam 2020 Open

David Mercer · 2023

DOE Radiological Triage Program Analyst Open Book Exam 2023 Open

David Mercer · 2023

This document contains the 2023 DOE Radiological Triage Program Analyst Open Book Exam for Los Alamos National Laboratory.

DOE Radiological Triage Program Analyst Open Book Exam 2022 Open

David Mercer · 2023

This document contains the 2022 open book examination for Radiological Triage Program Analysts for Los Alamos National Laboratory. "The following questions test your knowledge relevant to the DOE Radiological Triage program. There is no ti…

DOE Radiological Triage Program: Analyst Open Book Exam 2021 Open

David Mercer · 2023

This document contains the open book exam for Radiological Triage Program Analysts for Los Alamos National Laboratory. "The following questions test your knowledge relevant to the DOE Radiological Triage program. There is no time limit, an…

Development of a compact fast-neutron spectrometer for nuclear emergency response applications Open

Jesus Perello, Tony H. Shin, Theresa Cutler, K. Bartlett, Cameron Bates , et al. · 2023

Triage Exam, August 2006 (V.2.2) Open

David Mercer · 2023

The following questions test knowledge relevant to the DOE Radiological Triage and DHS Secondary Reachback programs. There is no time limit, and you may use any reference materials you like. Each question has only one best answer. There ar…

Nuclear Facility Experience with the SOFIA Ultra-High-Resolution Microcalorimeter Gamma Spectrometer Open

Mark Croce, Daniel Becker, D A Bennett, Robin Cantor, Matthew H. Carpenter , et al. · 2022

NSDD Flavor Drill July 2022 Answers Open

David Mercer, Brian Jennings · 2022

creating unified or compatible systems for nuclear material inventory management. NSDD representatives provided an overview of nuclear forensics and presented considerations for developments of inventory management that might be synergisti…

NSDD Drill January 2022 Answers Open

David Mercer, Jennifer Auxier, Brian Jennings · 2022

This drill involves identification of radiopharmaceuticals or radionuclides that associated with the medical industry. There is no need for quantification. Spectra are provided in their original format and also in Ortec CHN and Canberra CN…

Gamma and Decay Energy Spectroscopy Measurements of Trinitite Open

David Mercer, K. Koehler, Mark Croce, Andrew S. Hoover, Philip Hypes , et al. · 2021

We report gamma ray spectroscopy measurements of trinitite samples and analogous samples obtained from detonation sites in Nevada and Semipalatinsk, as well as in situ measurements of topsoil at the Trinity site. We also report the …

Software and Files Index Open

Eric Cervi, Andrea Favalli, Vlad Henzl, Madeline Lockhart, David Mercer , et al. · 2021

The purpose of this document is to provide an index of the software and files used to generate the results and findings documented in Section 4 of the scoping study report on Radiation Signatures relevant to Thorium Fuel Cycles.

Safeguards Technology for Thorium Fuel Cycles: Research and Development Needs Assessment and Recommendations Open

Louise G. Worrall, Vlad Henzl, Alicia Swift, Nicholas Luciano, Eric Cervi , et al. · 2021

This report presents Safeguards Technology for Thorium Fuel Cycles: Research and Development Needs Assessment and Recommendations prepared for the National Nuclear Security Administration (NNSA) Office of Defense Nuclear Nonproliferation R…

Measurement of impurity in using decay energy spectroscopy Open

Aidan Tollefson, Chandler Smith, Matthew H. Carpenter, Mark Croce, Michael E. Fassbender , et al. · 2021

Gamma and Decay Energy Spectroscopy Measurements of Trinitite Open

David Mercer, K. Koehler, Mark Croce, A. Hoover, Philip Hypes , et al. · 2021

We report gamma ray spectroscopy measurements of trinitite samples and analogous samples obtained from detonation sites in Nevada and Semipalatinsk, as well as in situ measurements of topsoil at the Trinity site. We also report the first i…

Measurement of Ac227 Impurity in Ac225 using Decay Energy Spectroscopy Open

Aidan Tollefson, Chandler Smith, Matthew H. Carpenter, Mark Croce, Michael E. Fassbender , et al. · 2021

225Ac is a valuable medical radionuclide for targeted alpha therapy, but 227Ac is an undesirable byproduct of an accelerator-based synthesis method under investigation. Sufficient detector sensitivity is critical for quantifying the trace …

Improved plutonium and americium photon branching ratios from microcalorimeter gamma spectroscopy Open

Michael Duncan Yoho, K. Koehler, Daniel Becker, D. A. Bennett, Matthew H. Carpenter , et al. · 2020

Isotopic analysis of plutonium measured with very thick absorbers and high-granularity spectra Open

Duc Vo, David Mercer · 2020

FRAM is LANL-designed software designed to extract plutonium and uranium isotopic information from gamma ray spectra. This is an important capability for NEST and STAB; however, FRAM performance has been poor when applied to field data col…

Patient Travel Concerns After Treatment with <sup>177</sup>Lu-DOTATATE Open

A. Tuba Kendi, Josh Mailman, Boris G. Naraev, David Mercer, James Kyle Underwood , et al. · 2020

Since its approval by the U.S. Food and Drug Administration in late January 2018, 177Lu-labeled DOTATATE (Lutathera; Advanced Accelerator Applications, a Novartis company) has been used for the treatment of advanced somatostatin receptor–p…

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