Timothy Jacomb-Hood is currently performing his dissertation research at Pacific Northwest National Laboratory. While there, he is working on in-field gamma radiation imaging for triage of high activity nuclear forensic samples collected in a post-detonation environment. Three types of measurements are made on a nuclear forensic sample: radiation counting, imaging and microscopy, and isotope mass spectroscopy. A variety of different measurement techniques are used within each broad type of measurement, and these are determined to best measure each unique sample. One constant is that gamma-ray spectroscopy is used as a first measurement for bulk analysis. The results of the gamma-ray spectroscopy can be used to inform which techniques will be used to further analyze the sample. This process could be significantly improved if a single in-field nondestructive measurement were to provide an isotopically sensitive spatial distribution of the radionuclides present and isolate the subset of the sample that is most important to analyze. This dissertation research will advance the field of orthogonal strip germanium imaging at high rate. It is my intent to demonstrate that the technique will improve spatial resolution over previous experiments while also demonstrating its viability for samples of radioactivity that were previously unmeasurable on such a system. This will allow gamma-ray spectroscopy to not be limited to bulk measurement, but to measure isotopic heterogeneity within a sample. Jacomb-Hood is being advised by Dr. Craig Marianno.
- T.W Jacomb-Hood, C. M. Marianno, B. A. Van Devender, J. E. Fast, "Ultra-high Rate Gamma Spectroscopy for Post-detonation Nuclear Forensics", National Technical Nuclear Forensics Center Annual Academic-Laboratory Collaboration and Technical Advancement Program Review. Los Alamos, NM. August 1st-4th, 2016.
- T. Jacomb-Hood, L. Scott, M. Shah, K. Ford, S. Horowitz, M. Subbaiah, C. Gariazzo, S. Chirayath, D. Kovacic, S. Mladineo, M. Schanfein, M. Koskelo, "The Safeguards and Organizational Culture Workshop", 57th Annual Meeting of the Institute for Nuclear Materials Management (INMM), Atlanta, Georgia, 24-28 July 2016.
- C. Marianno, J.T. Falkner, T. Jacomb-Hood, J. Trevino, L. Dromgoole, M. Shah, M. Boyd, G. Emory, D. Murchison, "Mobile Radiation Detection Security Sweeps as Teaching Tool", 61st Annual Meeting of the Health Physics Society (HPS), Spokane, Washington, 17-21 July 2016.
- T.W. Jacomb-Hood, C.M. Marianno, J.E. Fast, B.A. Van Devender, "An Overview of the Ultra-high Rate Germanium Detector", 2016 South Texas Chapter of the Health Physics Society (STC-HPS) Student Presentation and Annual Business Meeting, Bryan, Texas, 16 April 2016.
- Robert M. Zedric, Scott L. Stewart, Blake A. Palles, Timothy W. Jacomb-Hood, Stephen B. Gerlt, David A. Vermillion, Corey Keith, Marlene Bencomo., "Top Things to Know About Special Nuclear Material", INMM 56th Annual Meeting, Indian Wells, California, 12-16 July 2015.
- T.W. Jacomb-Hood, "Presenting Radioisotope Identi cation Detectors (RIIDs) for Threat Detection to Non-technical Professionals", American Nuclear Society Student Conference 2014, State College, PA, 5 April 2014.