Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 1 Proton Interrogation Proposal Steven Greene, P-25 2/5/2008

Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 2 Proposal : Short Range Proton Interrogation Co-Investigators Chris Morris, P-25 (Principal Investigator) Steve Greene, P-25 Fesseha Mariam, P-25 David Clark, P-22 Mark Makela, P-25 Greg Canavan, P-DO Randy Spaulding, ISU Lori Waters, D-5 Jay Elson, D-5

Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 3 Delayed neutron measurement Materials spanning the periodic chart - 12 C to 238 U Simple targets 10s or 100s of gram samples Simple counters 3 He gas mixture proportional counter LaBr

Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 4 Proton interrogation of materials pRad facility is well suited. Pulse on demand Current monitor Beam profile from cameras Beta-delayed emissions diagnostic for uranium

Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 5 Delayed neutron cross sections vs. A  Delayed neutrons from Pb, Hg, Au appear to arise from fission.  18 O has the highest delayed neutron production of all targets measured.  Typical background materials like iron and Aluminum have cross sections ~1/100 th of Uranium

Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 6 Compound targets Preliminary investigation of shielding effects ‘Environmental’ clutter Intentional shielding

Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 7 Relative neutron yields from compound targets

Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 8 Present Proposal Detector development Multi-layered array Neutron energy binning Gamma signal Additional targets Simple, A = Compound

Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 9 Detector Development 3 He mixture proportional tubes CH 2 moderator Layered for energy binning

Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 10 Targeting A = Pd, Ag, Sn, I, Cs, La, Sm, Gd Compound Targets Materials in front of targets Materials around targets Materials behind targets

Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Slide 11 Time Request targets and scenarios Average of ~1 target per hour, including setup & overhead Repeat some measurements at multiple detector distances Time is ~ 60 hours ‘Cycle B’ Fridays work