Neutron Generator Background - Thermo Scientific Home Page

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)