1. United States Department of Homeland Security, Countering Weapons of Mass Destruction Office, available at https://www.dhs.gov/countering-weapons-mass-destruction-office. (Accessed April 2nd, 2021).
2. National Academy of Engineering. NAE Grand Challenges for Engineering, available at http://www.engineeringchallenges.org/challenges.aspx. (Accessed April 2nd, 2021).
3. Nuclear Smuggling Detection and Deterrence FY 2018 Data Analysis Annual Report;Shannon,2019
4. Passive Nondestructive Assay of Nuclear Materials;Reilly,1991
5. T.W. Burrows, Q-Value Calculator (QCalc), available at https://www.nndc.bnl.gov/qcalc/. (Accessed April 2nd, 2021).