An emergency urine bioassay method for 241Am by extraction chromatography and liquid scintillation counting

Baki Sadi, Chunsheng Li, Ali Masoud, Raymond Ko, Gary H. Kramer

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

An emergency urine bioassay method has been developed for the determination of (241)Am in human urine samples. The method is based on extraction chromatographic separation of (241)Am from urine on a single DGA (N,N,N',N'-tetraoctyldiglycolamide) resin column followed by liquid scintillation counting of (241)Am. The minimum detectable activity (MDA) for the method was 0.02 Bq. Considering the volume of urine sample (17.2 ml) used by the method; the MDA was 1.3 Bq l(-1). Measurement accuracy (relative bias, B(r)) and repeatability (relative precision, S(B)) of the method were found to be -3.4 and 8.9 %, respectively, when urine samples were spiked with (241)Am (20 Bq l(-1)). Excellent linearity (r(2) > 0.999) was established over the range of 2-200 Bq l(-1). The method was also found to be robust (S(B)=10.2 %) against matrix effects from different urine samples. Performance of the rapid bioassay method for accuracy and repeatability were evaluated against the performance criteria for radiobioassay (ANSI N13.30) and found to be in compliance. Considering the simplicity, excellent analytical figures of merit and fast sample turnaround time (<1 h), it is a very promising rapid bioassay method for supporting the medical response to an emergency where internal contamination of (241)Am is involved.

Original languageEnglish
Pages (from-to)134-9
Number of pages6
JournalRadiation Protection Dosimetry
Volume141
Issue number2
DOIs
Publication statusPublished - Sept 2010
Externally publishedYes

Keywords

  • Americium
  • Biological Assay
  • Humans
  • Radiation Monitoring
  • Scintillation Counting
  • Urinalysis
  • Urine
  • Journal Article
  • Research Support, Non-U.S. Gov't

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