SYMPOSIA PAPER Published: 01 January 1995

Determination of the Concentration and Isotopic Composition of Uranium in Environmental Air Filters


For many years, Lawrence Livermore National Laboratory has collected monthly air-particulate filter samples from a variety of environmental monitoring stations on and off site. Historically, the concentration and isotopic composition of uranium collected on these filters were determined by isotope dilution using a 233U spike and thermal ionization mass spectrometry (TIMS). For samples containing as little as 10 ng of uranium, ICP-MS is now used to make these measurements to the required level of precision, 5% in the measured 235/238 and 233/238. Unless particular care is taken to control bias in the mass filter, variable mass bias limits accuracy to a few percent. Measurements of the minor isotopes 236 (if present) and 234 are also possible and provide useful information for identifying the source of the uranium. The advantage of ICP-MS is in rapid analysis, ≈12 min of instrument time per sample.

Author Information

Russ, GP
Lawrence Livermore National Laboratory, Livermore, CA
Bazan, JM
Lawrence Livermore National Laboratory, Livermore, CA
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Developed by Committee: C26
Pages: 131–140
DOI: 10.1520/STP15985S
ISBN-EB: 978-0-8031-5315-8
ISBN-13: 978-0-8031-2034-1