Removal of long-lived 222Rn daughters by electropolishing thin layers of stainless steel

R. W. Schnee, M. A. Bowles, R. Bunker, K. McCabe, J. White, P. Cushman, M. Pepin, V. E. Guiseppe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations

Abstract

Long-lived alpha and beta emitters in the 222Rn decay chain on detector surfaces may be the limiting background in many experiments attempting to detect dark matter or neutrinoless double beta decay. Removal of tens of microns of material via electropolishing has been shown to be effective at removing radon daughters implanted into material surfaces. Some applications, however, require the removal of uniform and significantly smaller thicknesses. Here, we demonstrate that electropolishing < 1 μm from stainless-steel plates reduces the contamination efficiently, by a factor > 100. Examination of electropolished wires with a scanning electron microscope confirms that the thickness removed is reproducible and reasonably uniform. Together, these tests demonstrate the effectiveness of removal of radon daughters for a proposed low-radiation, multi-wire proportional chamber (the BetaCage), without compromising the screener's energy resolution. More generally, electropolishing thin layers of stainless steel may effectively remove radon daughters without compromising precision-machined parts.

Original languageEnglish (US)
Title of host publicationLow Radioactivity Techniques 2013, LRT 2013 - Proceedings of the IV International Workshop in Low Radioactivity Techniques
Pages128-131
Number of pages4
DOIs
StatePublished - Sep 9 2013
Event4th International Workshop in Low Radioactivity Techniques 2013, LRT 2013 - Assergi, Italy
Duration: Apr 10 2013Apr 12 2013

Publication series

NameAIP Conference Proceedings
Volume1549
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other4th International Workshop in Low Radioactivity Techniques 2013, LRT 2013
CountryItaly
CityAssergi
Period4/10/134/12/13

Keywords

  • Radon daughters plate-out
  • electropolishing of steel surfaces
  • radiopurity

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