Process for decontaminating radioactively contaminated metal or

Details Process for decontaminating radioactively contaminated metal or Process for decontaminating radioactively contaminated metal or

1991-11-25

1994-05-24

Walsh, Donald P.

Compositions

Radioactive compositions

134 1, 134 3, 134 2211, 134 2216, 134 24, 134 27, 134 28, 204 15, 204130, 204140, 2041415, 252 793, 252626, 252631, 252632, 423 2, 423 4, 423 18, 423 20, G21F 916, G21F 908, C09K 1308, B08B 900

Patent

active

RE0346136

ABSTRACT:
Contaminated surface layers are decontaminated by treatment with an aqueous fluorine base-containing decontamination solution. The aqueous decontamination solution contains 0.05 to 50 Mol of decontamination agent per liter, and the decontamination agent preferably comprises at least one substance from the group: [colon] hexafluorosilicate acid, fluoroboric acid, and the salts of both of these. The decontamination solution produces the required high decontamination factors on metallic substances and brickworks as well. The used decontamination solution can, after regeneration, be recycled into the decontamination process.
Release of decontaminated material by dissolution of the surface layer of the decontaminated objects provides decontamination of objects having complicated and hard-to-measure geometries.
The decontamination agent (HBF.sub.4 -acid) is advantageously produced from contaminated boric acid from pressurized water reactor wastes by reaction with fluoride or hydrofluoric acid. The HBF.sub.4 -acid thus produced is, through distillation, separated from the contaminants and impurities.

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"Dekontamination eines Reaktor-Kuhlwasserkreislaufs am Beispiel des Forschungsreaktors WWR-S in Rossendorf", H. Unger and D. Westphal, Kernenergie, pp. 285-290, Dec. 11, 1968.
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