Evaluation of measurements of 238Pu, 239Pu and 240Pu in urine at the microbecquerel level using thermal ionization mass spectrometry and alpha-spectrometry at Los Alamos National Laboratory: Results of a two year comparison test (LA-UR-06-8055) |
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| Authors: | N E Bores M K Schultz J M Rankin A J Denton G F Payne R E Steiner S P LaMont and S B Ortiz |
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| Institution: | (1) Oak Ridge National Laboratory, Quality Systems and Services Division, Intercomparison Studies Program, Oak Ridge, TN 37831, USA;(2) University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA;(3) Los Alamos National Laboratory, Nuclear and Radiochemistry Group, Los Alamos, NM 87545, USA |
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| Abstract: | The Intercomparison Studies Program (ISP) at the Oak Ridge National Laboratory (ORNL, Oak Ridge, TN, USA) provides natural-matrix
urine quality-assurance/quality-control (QA/QC) samples to radiobioassay analysis laboratories. In 2003, a single laboratory
(Los Alamos National Laboratory LANL, Los Alamos NM USA) requested a change in the test-samples provided previously by the
ISP. The change was requested to evaluate measurement performance for analyses conducted using thermal-ionization mass spectrometry
(TIMS). Radionuclides included 239Pu at two activity levels (75–150 μBq·sample−1 and 1200–1600 μBq·sample−1) and 238Pu (3700–7400 μBq·sample−1). In addition, 240Pu was added to the samples so that the 239+240Pu specific activity was 3700–7400 μBq·sample−1. In this paper, the results of testing during the period May, 2003 through September, 2005 are presented and discussed. |
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