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Analysis of total diet study foods for gamma-ray emitting radionuclides

  • W. C. Cunningham
Article

Summary

Foods collected for radionuclide analysis under the Food and Drug Administration&apos;s (FDA&apos;s) Total Diet Study (TDS) Program were analyzed by the Center for Food Safety and Applied Nutrition (CFSAN) as quality assurance (QA) for analyses performed at FDA&apos;s Winchester Engineering and Analytical Center (WEAC). 200-ml QA portions were analyzed for gamma-ray emitting fission products and naturally occurring radionuclides. Efficiency, pileup correction, absorption effects, and accuracy were determined by analyzing a variety of certified reference materials and KNO<Subscript>3</Subscript> and KCl solutions. <Superscript>40</Superscript>K results agreed well with those from WEAC and with total K results from other techniques. Count times as low as 2 minutes were sufficient to confirm that radioactivity concentrations were below regulatory limits.

Keywords

Instrumental Neutron Activation Analysis Radioactivity Concentration Fiscal Year Food Portion Absolute Efficiency 

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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • W. C. Cunningham
    • 1
  1. 1.Elemental Research Branch (HFS-338), U. S. Food and Drug Administration

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