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Monte Carlo simulation of active neutron interrogation system

Monte Carlo simulation of active neutron interrogation system developed for detection of illicit materials А. Sh. Georgadze Kiev Institute for Nuclear Research a.sh.georgadze@gmail,com. 2 nd Jagelonian Symposium on Fundamental and Applied Subatomic Physics.

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Monte Carlo simulation of active neutron interrogation system

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  1. Monte Carlo simulation of active neutron interrogation system developed for detection of illicit materials А.Sh. Georgadze Kiev Institute for Nuclear Research a.sh.georgadze@gmail,com 2ndJagelonian Symposium on Fundamental and Applied Subatomic Physics

  2. Associated alpha-particle detection Probing with fast-neutron analysis (FNA) can excite gamma rays from carbon and oxygen found in excess in these explosives. To enhance the signal from the target and suppress background noise used a generator that produces back-to-back neutrons and α particles (a technique called associated-particle imaging) to identify the volume in which the neutron produces a gamma ray by tagging its time of emission and direction

  3. Explosive detection Using gamma lines after Nitrogen and Oxygen nuclei excitation Detect automatically 30 explosives High cost - 130000EURO !

  4. Experiment in Ukraine Neutron generator ІNG-3 matrix 11×13 CsI (30×30 cm) with coded aperture mask 150 см Need repeat 5 times with changed mask. TNT

  5. Chemical composition of explosives, drugs and common materials

  6. Compact neutron generators Neutron flux Neutron flux 108– 1014 n/s

  7. Neutron pulses 10 Neutron pulses 10- -20000 20000/s

  8. Cost effective gamma/neutron detector design Have applied block-detectors design (for PET) → less number of PMTs Photomultipliers PMT 9 х 9 Light sharing light guide Scintillation bars 30 bars 50 mm х 50 mm x 400 mm - plastic scintillator 10 bars 50 mm х 50 mm x 400 mm - CsI scintillator plastic scintillator - scatterer CsI (BGO) - absorber

  9. Neutron captur gated detection principle Fast signal from proton γ p n Gd  8 MeV n 25 ms t t  25 ms Delayed signal

  10. Scintillation bar enclosing Neutron captured by Gd [%] mean time until the capture [μs] 5  5 cm 55400 сm3 88 25 Plastic scintillator Mylar Gadolinium oxide containing film Light output 10000 ph/МеV

  11. Compton imaging of gamma sources

  12. GEANT4 simulation of Compton scattering Gamma-ray source Gray rays - gammas Green rays – electrons

  13. Electronic collimation simulation Gamma ray beam direction

  14. Electronic collimation

  15. GEANT4 simulation of fissile material detection with neutron analysis Neutron generator Gamma/neutron detector Fissile or explosive material Distance to gamma/neutron detector 40 cm

  16. Chemical compositions of the materials used for the simulation Explosives Composition 1. Ammonium nitrate H4N2O3 C8H8N4O7 C3H8N8O8 C2H10N4O6 C7H6N703 C4H6N6O6 C8H8N12O12 C8H7N3O11 C3H8N3O3 2. Ammonium picrate 3. RDX 4. Ethylenediamine 5. TNT 6. C4 7. CL20 8. Nitrocellulose 9. Nitroglycerine

  17. Simulation of detected gamma-quanta and neutrons hitting detector - neutron generator flux - 108n/s expositions 1 min number of neutrons number of gammas Material PLUTONIUM_DIOXIDE+ PLUTONIUM_DIOXIDE+ 4,80E+03 5,52E+04 URANIUM_OXIDE 4,20E+03 4,96E+04 G4_CELLULOSE NITRATE 2,51E+03 2,45E+04 G4_NYLON-11_RILSAN 2,40E+03 2,36E+04 AN 2,96E+04 4,12E+04 TNT 2,66E+04 4,96E+04 RDX 3,00E+03 5,46E+04 CL20 5,91E+04 2,80E+03 No object 2,10E+03 2,06E+04

  18. GEANT4 simulation of explosive detection with neutron analysis Blue rays – neutrons Neutron generator Red rays - gammas Gamma/neutron detector Explosive SiO2

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