Neutron Generator Background - Thermo Scientific Home Page

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Total Reaction Cross Section [barn] 10 1 0.1 0.01 0.001 Neutron Generator Background Energy Dependence of 2 H(d,n) 3 He & 3 H(d,n) 4 He D-T D-D 10 100 1000 Deuteron Energy [keV] 10000 100000 • Small electrostatic particle accelerator • Hermetically sealed vacuum device • Hydrogen isotopes impinge metal hydride target • Nuclear fusion reactions: – D-D (En = 2.5 MeV) – D-T (En = 14.1 MeV) • Traditional high yield neutron generators use cold cathode ion sources • Tritium activity ranges from 2 – 10 Ci MP 320
Fission Cross Section [barns] 1E+06 1E+04 1E+02 1E+00 1E-02 1E-04 1E-06 What is Active Neutron Interrogation? Large Object Neutron Radiography Sensors Create 2-D Images (Image courtesy of B. Sowerby, Commonwealth Scientific and Industrial Research Organisation, Australia ) Neutrons Fission Special Nuclear Material Sensors Look For Fission Signatures ENDF/B-VI U-235 (N,F) ENDF/B-VI U-238 (N,F) 1E-08 14 MeV 1E-10 1.E-10 1.E-08 1.E-06 1.E-04 1.E-02 1.E+00 1.E+02 Neutron Energy [MeV] i) Gamma-Rays From Fast Neutron Inelastic Scattering ii) Prompt Neutrons From Fast Fission Fast Neutron Pulse From Neutron Generator i) Thermal Neutron Capture Gamma-Rays iii) Thermal Neutron Die-Away i) Gamma-Rays From the Decay of Activation Products ii) Prompt Neutrons From Thermal Fission ii) Delayed Fission Neutrons Thermal Neutrons Generated As Fast Neutrons Are Scatterd To Lower Energies At A Rate Dependent Upon The Surrounding Materials 0 100 200 300 400 500 600 700 800 900 1000 Time [microseconds] Signal Intensity [Counts] Neutrons Lead to Prompt Gamma Emission Sensors Examine Unique Elemental Signatures 2000 1500 1000 500 0 16 Oxygen 16 O n, p ( ) N 0 1 2 3 4 5 6 7 8 Photon Energy [MeV] Neutrons Can Be Vector Collimated Sensors Image Elemental Density (Images courtesy of J. Kocher, Dynamics Technology. Inc. and P. Hurley and J. Tinsley, DOE Special Technology Laboratory)
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