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Welcome to our 2023-2024 program year.  Our plan for this program year is for a mix of in-person and virtual meetings.  We will be holding virtual meetings in September, October, January, February and May. We will be holding the Undergraduate Research Symposium and our Initiation in-person in the spring.    

Iota Sigma Pi: Aurum Iodide Chapter

Announcement for the May Meeting (Virtual)


Meeting Date and Time: Friday May 3, 2024

7:00 pm – Presentation

8:00 pm – Social Hour (via Zoom Breakout Rooms)

Please RSVP by Thursday May 2, 2024 by Evite or to  The Zoom link will be sent to you on Thursday May 2, 2024.

Gregory D. Spriggs PhD, Lawrence Livermore National Laboratory


Title: The Film Scanning and Re-Analysis Project at the Lawrence Livermore National Laboratory

Abstract: There were 210 atmospheric nuclear tests and another nine nuclear cratering tests performed by the United States during the 1940s, 1950s, and early 1960s. Every test was extensively recorded with high quality motion picture films and photographs, providing a unique historic record of ~10,000 films/photos. The Lawrence Livermore National Laboratory and the Los Alamos National Laboratory are in the process of digitalizing these films using a high-definition film scanner. These newly digitalized films/photos are now in the process of being re-analyzed using modern image processing techniques to obtain more accurate and more precise measurements of the nuclear yield of each test and other scientific data pertaining to nuclear weapon effects.


Speaker’s Biography: Gregory Sprigg received his BS, MS, PhD in Nuclear Engineering from University of Arizona (when AZ was still a territory (actually, I got my PhD in 1982)). Greg currently works at the Lawrence Livermore National Laboratory (LLNL) as a nuclear weapon physicist in the Design Physics (DP) Division. As part of his job responsibilities, he heads up the Film Scanning and Re-Analysis Project. The primary objective of this project is to scan the ~7500 scientific films that were recorded by EG&G during the atmospheric nuclear testing era in the 1940s, 1950s, and early 1960s and re-analyze these films using modern computer techniques to obtain benchmark data for the Nuclear Weapon Complex. Before joining LLNL, he worked at the Los Alamos National Laboratory as a nuclear weapon physicist. Prior to that, he taught reactor physics at the University of Arizona, and was a nuclear plant startup engineer for General Electric. As an Engineering Duty Officer in the Naval Reserve, CAPT Spriggs 1) overhauled nuclear submarines for NAVSEA, 2) performed basic research for the Office of Naval Research (ONR), 3) performed test and evaluations for Commander, Operational Test and Evaluation Force (COMOPTEVFOR), and 4) was the commanding officer of an Engineering Duty Officer Unit assigned to the Space and Naval Warfare Systems Command (SPAWAR). He retired in 2007.


Please take a moment to pay your yearly dues.  You may do so by visiting the National website

Interested in becoming a member of Iota Sigma Pi? To find the application criteria and apply for membership, visit the National website at and go to Membership (

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