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A method for removing surface contamination on ultra-pure copper spectrometer components

  • E. W. Hoppe
  • A. Seifert
  • C. E. Aalseth
  • A. R. Day
  • O. T. Farmer
  • T. W. Hossbach
  • J. I. McIntyre
  • H. S. Miley
  • J. E. Smart
  • G. A. Warren
Article

Abstract

Spectrometers for the lowest-level radiometric measurements require materials of extreme radiopurity. Measurements of rare nuclear decays, e.g., neutrinoless double-beta decay, can require construction and shielding materials with bulk radiopurity reaching one micro-Becquerel per kilogram or less. When such extreme material purity is achieved, surface contamination, particularly solid daughters in the natural radon decay chains, can become the limiting background. High-purity copper is an important material for ultra-low-background spectrometers and thus is the focus of this work. A method for removing surface contamination at very low levels without attacking the bulk material is described. An assay method using a low-background proportional counter made of the material under examination is employed, and the preliminary result of achievable surface contamination levels is presented.

Keywords

Surface Contamination Surface Cleaning Pacific Northwest National Laboratory Detector Part Remove Surface Contamination 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    C. Brofferioa et al., Nucl. Phys., B (Proc. Suppl.) 145 (2005) 268.CrossRefGoogle Scholar
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    R. Brodzinski et al., Nucl. Instr. Meth. Phys. Res., A292 (1990) 337.Google Scholar
  3. 3.
    B. Clark et al., presented at the Synergies in Low-Background, Ultra-Sensitive Radiation Techniques Workshop, University of Minnesota, July 25–26, 2005, http://www.hep.umn.edu/lbcf/workshop/

Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  • E. W. Hoppe
    • 1
  • A. Seifert
    • 1
  • C. E. Aalseth
    • 1
  • A. R. Day
    • 1
  • O. T. Farmer
    • 1
  • T. W. Hossbach
    • 1
  • J. I. McIntyre
    • 1
  • H. S. Miley
    • 1
  • J. E. Smart
    • 1
  • G. A. Warren
    • 1
  1. 1.Pacific Northwest National LaboratoryRichlandUSA

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