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222Rn emanation from uranium-glazed ceramics.

R N Biagioni1, R W Sheets

  • 1Department of Chemistry, Southwest Missouri State University, Springfield 65804, USA.

Health Physics
|February 24, 2001
PubMed
Summary

Uranium-glazed dinnerware emits minimal radon-222 (Rn-222), posing no health risks. Inefficient radon-222 emanation from glazes, despite radium-226 content, explains the low levels observed.

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Area of Science:

  • Environmental Science
  • Nuclear Chemistry
  • Materials Science

Background:

  • Uranium compounds are sometimes used in glazes for ceramics, imparting distinctive colors.
  • Radon-222 (Rn-222), a radioactive gas, can be a decay product of radium-226 (Ra-226).
  • The potential for radioactive material in consumer products to pose health risks necessitates careful evaluation.

Purpose of the Study:

  • To quantify radon-222 (Rn-222) emanation from uranium-glazed dinnerware.
  • To assess the health risks associated with Rn-222 emanation from such dinnerware.
  • To investigate the relationship between radium-226 (Ra-226) content in glazes and Rn-222 emanation.

Main Methods:

  • Measurement of Rn-222 emanation rates from uranium-glazed dinnerware samples.
  • Quantification of radium-226 (Ra-226) content in the glazes using alpha spectrometry.
  • Comparison of measured Rn-222 emanation with Ra-226 content to determine emanation efficiency.

Main Results:

  • Uranium-glazed dinnerware emanated an average of less than 0.1 Bq of Rn-222 per piece.
  • The measured Rn-222 emanation was less than 5% of the potential emanation based on Ra-226 content, indicating inefficient emanation.
  • The presence of Rn-222 progeny within the glazes was consistent with the observed low emanation rates.

Conclusions:

  • The low levels of Rn-222 emanating from uranium-glazed dinnerware suggest no significant associated health risks.
  • The inefficient emanation of Rn-222 from the glazes is attributed to factors such as Rn-222 progeny incorporation.
  • Reagent-grade uranium compounds themselves can be a source of measurable Rn-222.

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