Investigating Neutron and Gamma Radiography Techniquesand their Comparison by the simulation code MCNP

Neutron and Gamma radiography are two important techniques for investigating objects which cannot beobserved ordinarily such as the inside body organs including bones, inside part of the fuselage or the nuclearfuel of the reactors. Gamma radiography, which has a longer tradition compared with the neutronradiography, is effective in many ways; however, for analyzing the objects with a hard coverage it does nothelp. Therefore, neutron radiography is used instead. In fact, due to the different nature of the gamma andneutron beams interaction with the elements, different information is provided which complement both andcan be considerably helpful in recognizing and investigating the desired case. As a result, these two kinds ofradiographies can be considered as complementary. In this study ۱۱ pieces of ۱۱ different materials (i.e. ۲۳۸U,U Nat, ۲۳۵U ,۸۲pb ۴۷Ag, ۲۹U, ۲۸Ni, Sn ۵۰,C ۶, C۲H۴ and H۲O) in the presence of high-energy gamma source (i.e.Cobalt Co۶۰), low-energy gamma mesh (Iridium Ir۷۷) and thermal neutron mesh with the energy (۰.۰۲۵ ev)were simulated using the MCNP technique. The output data were changed into images by MATLABsoftware. Comparison of the simulated image by the experimental radiography image indicates a reasonableconcordance between the two methods. As a result, use of MCNP code in simulating radiography images ofsample pieces with a complex geometry can be effective in separating the defective areas

کلیدواژه ها:

Neutron radiography ، Gamma radiography ، MCNP code