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Title: Removal of {sup 222}Rn daughters from metal surfaces

Removal of the long-lived {sup 222}Rn daughters ({sup 210}Pb, {sup 210}Bi and {sup 210}Po) from copper, stainless steel and germanium surfaces was investigated. As cleaning techniques etching and electro-polishing was applied to samples in a form of discs exposed earlier to a strong radon source. Reduction of the {sup 210}Pb activity was tested using a HPGe spectrometer, for {sup 210}Bi a beta spectrometer and for {sup 210}Po an alpha spectrometer was used. According to the conducted measurements electro-polishing was always more efficient compared to etching and in case of copper the activity reduction factors for {sup 210}Pb, {sup 210}Bi and {sup 210}Po were between 200 and 400. Etching does not remove {sup 210}Po from copper but works very efficiently from germanium. Results obtained for {sup 210}Pb and {sup 210}Bi for etched stainless steel were worse but still slightly better than those achieved for copper.
Authors:
;  [1] ;  [2] ; ;  [3]
  1. Jagiellonian University Institute of Physics, Lojasiewicza 11, 30-348 Kraków (Poland)
  2. Max Planck Institute for Physics, Föhringer Ring 6, 80805 München (Germany)
  3. Canberra-France, 1 Chemin de la Roseraie, B.P. 311, 67834 Tanneries Cedex (France)
Publication Date:
OSTI Identifier:
22488739
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1672; Journal Issue: 1; Conference: LRT 2015: 5. international workshop in low radioactivity techniques, Seattle, WA (United States), 18-20 Mar 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALPHA SPECTROMETERS; BETA SPECTROMETERS; BISMUTH 210; CLEANING; COPPER; ETCHING; GERMANIUM; LEAD 210; POLISHING; POLONIUM 210; RADON; RADON 222; REMOVAL; STAINLESS STEELS