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Dmitriev S.A.,Engineering and Research Center for Radioactive Waste Management and Environment Protection | Barinov A.S.,Engineering and Research Center for Radioactive Waste Management and Environment Protection | Kuptsov V.M.,Engineering and Research Center for Radioactive Waste Management and Environment Protection
Radiochemistry | Year: 2011

The simplest and the most efficient method for decontamination of sandy soils is separation of the finely dispersed fraction (<0.1 mm), with which ∼90% of the contaminating radionuclides are associated, by gravity sedimentation in water. However, for sandy soils from the Russian Research Centre Kurchatov Institute, the decontamination factor in this case is as low as 4-5. The decontamination factor can be further increased by using reagent treatment. The main parameters of the process are reagent composition and concentration, temperature, and liquid to solid ratio. The decontamination factor of 10-14 can be attained by reagent treatment with 2 M H 2SO 4 + 1 M H 3PO 4 or 3-4 M H 2SO 4 solutions for 7 h at 80°C, at the liquid to solid ratio of no less than 2 : 1. Two times higher decontamination factor can be attained by treatment with a 2 M H 2SO 4 + 0.6 M NH 4F solution, but high toxicity of fluorides restricts the possibility of using this reagent. © 2011 Pleiades Publishing, Ltd.


Dmitriev S.A.,Engineering and Research Center for Radioactive Waste Management and Environment Protection | Barinov A.S.,Engineering and Research Center for Radioactive Waste Management and Environment Protection | Kuptsov V.M.,Engineering and Research Center for Radioactive Waste Management and Environment Protection
Radiochemistry | Year: 2011

Possibilities of reagent decontamination of sandy soils contaminated with 137Cs are considered. Treatment with a 2 M H 2SO 4 solution for 7 h at 80°C and liquid-to-solid ratio (L : S) of 2 : 1 results not only in complete recovery of the finely dispersed fraction but also in additional leaching of 137Cs from particles of sandy size, with the decontamination factor reaching ∼60-70. The reagent treatment is the most efficient at L : S from 3 : 1 to 4 : 1 after preliminary separation of finely dispersed particles by sedimentation in water. © 2011 Pleiades Publishing, Ltd.

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