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Compact Neutron Generator Technology Models: JNG-2-DD/DT & JNG-3-DD/DT

O VERHOFF T ECHNOLOGY. Compact Neutron Generator Technology Models: JNG-2-DD/DT & JNG-3-DD/DT. ---Robert Goldstein Technical Associates, North American Distributor. A Brief Overview of Neutron Sources. Naturally Occurring/Environmental Cosmic The Solar Wind.

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Compact Neutron Generator Technology Models: JNG-2-DD/DT & JNG-3-DD/DT

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  1. OVERHOFF TECHNOLOGY Compact Neutron Generator Technology Models: JNG-2-DD/DT & JNG-3-DD/DT ---Robert Goldstein Technical Associates, North American Distributor

  2. A Brief Overview of Neutron Sources • Naturally Occurring/Environmental • Cosmic • The Solar Wind. High energy charged particles which hit nuclei in the earth’s atmosphere creating secondary particles including neutrons. Intensity varies inversely with solar activity. • Terrestrial • Spontaneous fission mostly U-238, less than 10% naturally induced U-235 fission. • 232Cf

  3. A Brief Overview of Neutron Sources • Intentional • Radioisotope sources • Photoneutron Sources • Accelerator sources • Nuclear reactors • Spallation sources • Neutron generators

  4. A Brief Overview of Neutron Sources • Intentional • Radioisotope sources 252Cf SP ½ life 100yr, E(n) 2.3MeV

  5. A Brief Overview of Neutron Sources • Intentional • Photoneutron Sources Radioisotope decay with Gamma energy exceeding the neutron binding energy of a nucleus can eject a Be or D2 neutron, called a photo-neutron

  6. A Brief Overview of Neutron Sources • Intentional • Accelerator Sources • The simplest way to use an accelerator to generate neutrons is to use the bremsstrahlung from electron accelerators such as synchrotron or beta tron to produce photoneutrons. This gives a continuous energy distribution which is not very useful. • Pulsed electron linacs can also be used, for example electron bombardment of Uranium can produce 30MeV neutrons.

  7. A Brief Overview of Neutron Sources • Intentional • Nuclear reactors and Spallation sources Are beyond the scope of this presentation.

  8. A Brief Overview of Neutron Sources • Intentional • Neutron Generators • A subset of the accelerator category which are also fusion devices. First used in 1933. • These small electrostatic accelerators use one of two exothermic reactions (produces energy): • D + 2H --> 3He3 + n 3.26 MeV • D + 3H --> 4He3 + n 17.6 MeV

  9. A Brief Overview of Neutron Sources • Intentional Neutron Generators • A Metal Hydride Target is Utilized After the Reaction: • The He and n travel in opposite directions producing high neutron yields. • Energy at different angles is given by: • 4En = En d +2(2 En Ed )1/2cosΘ = 3Q

  10. JNG-2 – Neutron GeneratorBenefits: • Portability • Reduced Power Input Requirements • Increased Neutron Output • Adaptable for Tailoring to Specific Customer Needs. • Reduced Manufacturing Costs • High Reliability and Long Operating Life

  11. Applications: Non-Destructive Testing • Homeland Security / Military • Nuclear Industry • Mining and Drilling • Medicine • Civil, Aeronautical, & Nautical Engineering • Research Laboratories

  12. Typical Target Based Neutron Generators versus JNG-2

  13. Neutron Generator – Basic Process

  14. Homeland Security / Military • Detection of Explosives & Fissile Material in Cargo or Luggage • Chemical Analysis of Questionable Contents • Land Mine Detection • Shipping Container Evaluation • Narcotics Detection

  15. Nuclear Industry • Compliance with the GALL Report NUREG-1801 (2010) • Measuring Radiation Structural Damage Containment Vessels Cooling Pools Pipes

  16. Nuclear Industry Generic Aging Lessons Learned (GALL) The GALL report evaluates existing programs for providing structural and component safety in Nuclear Power Plants. As these plants age and come up for renewal the GALL report facilitates the renewal process. Its focus is on the staff review on the augmented existing programs for license renewal. Incorporation of the GALL report into NUREG-1800 and 1801 improves efficiency of the license renewal process.

  17. Mining & Drilling • Oil Well Logging • On-Line Assaying of Materials i.e. Coal, Cement, etc • Borehole Logging • Fuel Reprocessing • Mining of a Wide Variety of Minerals

  18. Medicine • Neutron Radiography • Neutron Spectroscopy • Neutron Brachytherapy • Boron Neutron Capture Therapy (BNCT)

  19. Civil, Aeronautical, & Nautical Engineering • Structural Inspection • Gas & Oil Tank Walls • Bridge Integrity • Airplane/Ship Components • Piping

  20. Research Laboratories • Material Science • Nano Technology • Non-Invasive Analysis

  21. Specifications for JNG-2 & JNG-3

  22. Replaces Need for 252Cf Sources & Other Radioisotpe Sources • Safer to Operator • Safer to the Public • Eliminates Storage Issues of Source Material • No risk of theft of radioactive material

  23. Additional Benefits of the JNG-2 and JNG-3 • Ideal for Calibrating Neutron Detectors for Spontaneous Fission Neutrons • Calibrate Neutron Detectors for Higher Energies Including AmBe when Energy Correction Factor is established • JNG-2-DT Produces 14.1 MeV Neutrons and is available as a Neutron Interrogator

  24. Certification This instrument has been tested and certified by independent university tests at the University of Sydney, Australia

  25. Neutron Generators Table 1.1 and 1.2 Neutrons, Nuclei and Matter; An Exploration of the physics of Slow Neutrons By James Byrne (1994)

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