Studies Of Fast Neutron Radiography With The Cockcroft-Walton Accelerator

Neutron radiography is an important means of non-destructiveexamination and non-destructive evaluation，that is playing an importantrole in national defense industry, aviation, aerospace, nuclear,archaeology and so on. The basic principle is that a collimated neutronbeam penetrates the object to be detected, its intensity be decayed,researchers can obtain the image of the object internal features and thedefect information by imaging technology.FNR has the very high technical difficulty on low efficiency, bigscattering effects compared with TNR. This project is based on the600kV Cockcroft-Walton Accelerator, researched FNR techniques by usingthe method of MC method to simulate the conditions, established a setof standard imaging system resolution ratio3mm. The contribution isproposed, simulation research using the neutron channel to carry out thefast neutron collimation photography, to optimize the design of the fastneutron imaging experiment device and reasonable experimental plan,improved the neutron source make it5mm diameter non-point sourceand further reformation for line source, and these are difficulties incurrent experiment. Research results show that the experiment devicecan satisfy the design index.