| Popis: |
Depending on the neutron energy used, neutron radiography can be generally categorized as fast and thermal neutron radiography. Fast Neutron Radiography (FNR) with neutron energy more than 1 MeV opens up a new range of possibilities for a nondestructive inspection when the inspected object is thick or dense. Other traditional techniques, such as X-ray, gamma ray and thermal neutron radiography do not meet FNRs penetration capabilities in this area. Because of these distinctive features, this technique used in different industrial applications such as security (cargo investigation for contraband such as narcotics, explosives and illicit drugs ), gas/liquid flow and mixing, radiography and tomography of encapsulated heavy shielded low Z compound materials. The FNR images are produced directly during exposure; the neutrons create recoil protons, the protons activate a scintillator screen, the images can be collected with a computer controlled charge –coupled device (CCD) camera and finally the picture can be saved on a computer for the image processing. The aim of this research is to set up a portable fast neutron radiography (FNR) system and to test it for use in nondestructive testing of different composite materials. Experiments were carried out by using fast portative neutron generator Thermo Fischer MP320. |
