Adsorption of fission products on stainless steel and zirconium

Abstract

Contamination of the structural materials of nuclear reactors is a crucial question in view of radiation protection, especially, if due to some leakage, uranium and its fission products appear in the cooling water. Since it is rather difficult to obtain in situ experimental data on the actual amount of adsorbed radioactive species, the surface contamination may be quantified by measuring bulk activity concentrations of the cooling water and by calculating the amount of adsorbed material on the surfaces by using a partition coefficient. To do this, the knowledge of an appropriate adsorption isotherm is needed. Thus, our paper presents results, based on electrochemical measurements, about the extent and effect of the adsorption of certain fission productscaesium and iodide-in their ionic forms on the surface of some alloys used in the nuclear industry. Our findings allow the conclusion that the adsorption of these ions can be described by a Langmuir-type isotherm, where the saturation values correspond to surface monolayers.

H<sub>2</sub>O and HCl trace gas kinetics on crystalline HCl hydrates and amorphous HCl / H<sub>2</sub>O in the range 170 to 205 K: the HCl / H<sub>2</sub>O phase diagram revisited

“…They conclude that the water adsorption strongly depends on the materials and needs to be determined for each apparatus. On the other hand, electrochemical quartz crystal microbalance measurements have been used to determine the adsorption of fission products (caesium and iodide) in their ionic form on the surface of stainless steel and zirconium (Répánszki et al, 2007). The authors conclude that a Langmuir-type isotherm is able to describe the adsorption, where the saturation values correspond to surface monolayers.…”

Investigating metal‐inhibitor interaction with EQCM and SVET: 3‐amino‐1,2,4‐triazole on Au, Cu and Au–Cu galvanic coupling

“…[14] The electrochemical quartz crystal microbalance (EQCM) is another valuable electrochemical technique that allows the acquisition of relevant data about the adsorption of molecules on metallic surfaces with micro-scale resolution enabling the characterisation of their adsorption kinetics. [28][29][30][31][32][33][34][35][36] The technique works by applying an oscillatory electrical field to a quartz resonator placed between two electrodes made of the metal of interest; this makes the resonator to vibrate at its fundamental frequency. The frequency is sensible to the mass of the resonator and when adsorption or desorption occurs on the metallic surfaces, it is detected as a frequency shift.…”