proton interrogation
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Proton Interrogation. Proposal 20081923 Steven Greene, P-25 2/5/2008. Proposal 20081923: 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 - PowerPoint PPT PresentationTRANSCRIPT
Slide 1
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U N C L A S S I F I E D
Proton Interrogation
Proposal 20081923
Steven Greene, P-25
2/5/2008
Slide 2
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U N C L A S S I F I E D
Proposal 20081923: 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
Slide 3
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Delayed neutron measurement Materials spanning the periodic
chart - 12C to 238U Simple targets
• 10s or 100s of gram samples
Simple counters• 3He gas mixture proportional counter• LaBr
Vacuum Beam Pipe
He3 detector andLaBr detector
34-in target distance
Target ladder for small “bare”targets
Slide 4
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Proton interrogation of materials pRad facility is well suited.
• Pulse on demand• Current monitor• Beam profile from cameras
Beta-delayed emissions diagnostic for uranium
0.00001
0.0001
0.001
0.01
0.1
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10
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0 10 20 30 40 50 60 70 80 90 100Time (sec)
Cross section (mb/sec)
238U
235U
Lead
Tungsten
Iron
Copper
Aluminum
18O
Carbon
16O
0.00001
0.0001
0.001
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0.1
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10
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0.01 0.1 1 10 100
Time (sec)
Cross section (mb/sec)
238U
235U
Lead
Tungsten
Iron
Copper
Aluminum
18O
Carbon
16O
Slide 5
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Delayed neutron cross sections vs. A Delayed neutrons from Pb, Hg, Au
appear to arise from fission. 18O has the highest delayed neutron
production of all targets measured. Typical background materials like
iron and Aluminum have cross sections ~1/100th of Uranium
0.01
0.1
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0 50 100 150 200 250
Atomic Mass
Cross section (mb)
Slide 6
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Compound targets Preliminary investigation of
shielding effects• ‘Environmental’ clutter• Intentional shielding
DU: 1”x4”x4”
Pb: 2”x4”x8”
Null
Quad He3 detector315-cm target distance
310
He3 detector andLaBr detector
173-cm target distance440
Proton Beam centerline
22.50
ShieldingWater, Al, Steel, PbVarious thicknesses
Slide 7
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Relative neutron yields from compound targets
Slide 8
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Present Proposal Detector development
• Multi-layered array• Neutron energy binning
Gamma signal Additional targets
• Simple, A = 100-150• Compound
~4’ x 4’ detectorlocations
Slide 9
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Detector Development 3He mixture proportional tubes CH2 moderator Layered for energy binning
Slide 10
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Targeting A = 100 - 150
• Pd, Ag, Sn, I, Cs, La, Sm, Gd
Compound Targets• Materials in front of targets• Materials around targets• Materials behind targets
Slide 11
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Time Request 30 - 50 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