Advanced Safeguard Tools (Thrust Area #3) Zhong He University of Michigan 4 th Workshop, Michigan League, UM, Nov. 29 30, 2017 October 18, 2017
Nonproliferation Treaty Fissile Material Cutoff Treaty Develop new instruments and methods to verify that each state meets its obligations & no nuclear material is diverted. Determine the mass, enrichment & location of fissile materials University of Michigan: (a) Igor Jovanovic (b) Zhong He (c) Sara Pozzi (d) Kim Kearfott University of Florida Jim Baciak & Andreas Enqvist
Jovanovic s group: Study fundamentals of filament-induced plasmas Split lens doublefilament generation Figure 1. Schematic of the experimental setup. The dual-imaging system employs a probe laser and CMOS detector for shadowgraphy, tracking the shock front produced from filament-target interaction, and ICCD for viewing emission from isolated target species in the corresponding target plasma. Species are isolated by selective bandpass (BP) filters placed in front of the ICCD. High-reflectivity (HR) mirrors allow for alignment of the probe beam used in shadowgraphy.
He s Group: Robotic SLAM- Gamma Imaging Carnegie Mellon University & University of Michigan
Fast-Neutron Multiplicity Counter (Pozzi s group) INL (2012) ISPRA, Italy (2013) Design concepts in MCNPX-PoliMi (2012) Passive measurements: 16 EJ-309 (2013) INL (2016) Stilbene crystal INL (2015) Passive measurements: 8 EJ-309 and 8 Stilbene (2015) Active measurements: 8 EJ-309 and 8 Stilbene (2016) UM, Consortium Prof. Sara forpozzi, Verification Dr. Di Technology Fulvio, et al. National Lab Collaborators: Dr. David Chichester, INL
Review and Publication of Historical Data Journal West, G. W., Kearfott, K. J., Seow, C. Y., Investigation of Optically Stimulated Luminescence and Signal Fading Properties of Several Materials, Health Physics, accepted January 5, 2017. Chain of Custody Detectors (Kearfott Undergraduate Team) => Overall Project Challenge: Reproduce the data and develop method Dosimetry Source Characterization Journal Boria, A. J., Rucinski, B. D., Abraham, S. A., Dawson, A. S., Jawad, A. H., Miklos, J. A., Kearfott, K. J., Cs-137 Dosimeter Irradiation Facilities: Calibration Frequency, Precision, and Accuracy, Health Physics 112(4):357-363, 2017. Þ Challenge: Moved in 2016, re-characterize
MeV -1 0.4 0.3 0.2 0.1 Impact of Neutron Source Encapsulation (Baciak & Enqvist s group) Bare Pu-240 Bare Cf-252 Cf-252 in Cu 1.39cm 0.0 0 2 4 6 8 10 Consortium Energy for Verification (MeV) Technology Using 252 Cf to measure the neutron detector efficiency as a surrogate for Pu sources in cases where the detector response is a simple function of energy. A few mm of metallic encapsulation influences 252 Cf spectrum to a degree that is measurable in safeguards systems. This also means that the average energy of a point 252 Cf spontaneous fission neutron source can easily be tailored to match any lower value. In non-linear response detectors such as the Active Well Coincidence Counter, Monte Carlo simulations can be used to calculate the encapsulation needed.
Summary Jovanovic s group has been developing a laser-based system for standoff isotope detection. Zhong He s group has been developing techniques for more accurate characterization of SNMs, even behind moderate shielding materials, using 3-D CZT gamma-ray imaging spectrometers. Sara Pozzi s group has been working on fast-neutron multiplicity counters. Kim Kearfott s group is developing chain-of-custody detectors using optically stimulated luminescence dosimeters UF (a) A portable neutron multiplicity counter for objects of unconstrained shapes is being investigated; (b) Study the use of 252 Cf as a surrogate for plutonium. (c) An organo-metal loaded liquid scintillation detector for gamma-neutron detection is under development. (d) Plume tracking