Fast and thermal neutron radiographies based on a compact neutron generator

Abstract

The outbreak of the disease and infection in the hospital environment and medical equipment is one of the concerns of modern life. One of the effective ways for preventing and reducing the complications of infections is modification of the surface. Here, the handmade atmospheric plasma spray system is used for accumulating copper as an antibacterial agent on the 316L stainless steel substrate, which applies to hospital environment and medical equipment. As a durable coating with proper adhesion is needed on the substrate, the effect of stand-off distance (SOD) which is an important parameter of the spray on the microstructure, the hardness and adhesion of the copper coating on the 316L stainless steel were investigated. The structure and phase composition of copper depositions were investigated using scanning electron microscopy and X-ray diffraction. The adhesion and hardness of depositions are evidenced using the cross cut tester and Vickers hardness tester, respectively. The findings confirm that the voids in the coatings increase with increasing SOD, which leads to decreasing the hardness of coatings and also the adhesion strength between depositions and substrate. In addition, by increasing the SOD, the oxygen content and the size of grains in the lamellae (fine structure) of coatings also increase.

Comparison of different geometric configurations and materials for neutron radiography purposes based on a 241Am/Be neutron source

“…Based on previous articles by Fantidis et al [8,19,20] and da Silva and Crispim [11], high density polyethylene (HD-PE) is the optimum moderator because it provides the highest thermal neutron flux. In the literature, there are two different concepts for the design of a thermal NR collimator.…”

The Comparison of Neutron Beams through 7Li(p,n) Reactions for the Design of a Thermal Neutron Radiography Facility using the MCNPX Code

“…A representative unit for thermal NR based on Deuterium-Tritium, Deuterium-Deuterium or Tritium-Tritium neutron generators, 252 Cf, 241 Am/Be isotopic neutron sources, and proton or electron accelerators usually on beryllium target [3,7,[12][13][14]. The use of proton accelerators in a lithium target for NR facilities is rare.…”

Development of a Neutron Radiography System based on a 10 MeV Electron Linac

“…In order to overcome the lack of the nuclear reactors, the required neutron beams usually are derived by accelerators or from some isotopic sources. A typical facility includes Deuterium-Tritium (DT) [34], Deuterium-Deuterium (DD) [34]- [37], Tritium-Tritium (TT) [34], [38] neutron generators, 252 Cf [39][40][41], 241 Am/Be [42][43][44] isotopic neutron sources, proton [45] or electron [46] usually on accelerators on beryllium [10], [47][48][49][50] or lithium [51] targets.…”