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Radiation Protection Dosimetry Advance Access originally published online on June 28, 2005
Radiation Protection Dosimetry 2006 118(1):106-110; doi:10.1093/rpd/nci318
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

TECHNICAL NOTE

Determination of 234U/238U ratio: comparison of multi-collector ICPMS and ICP-QMS for water, hair and nails samples, and comparison with alpha-spectrometry for water samples

Z. Karpas1,*, A. Lorber1, H. Sela1, O. Paz-Tal1, Y. Hagag1, P. Kurttio2 and L. Salonen2

1 Nuclear Research Center, Negev, P.O. Box 9001, Beer-Sheva 84190, Israel
2 STUK—Radiation and Nuclear Safety Authority, Research and Environmental Surveillance, P.O. Box 14, FIN 00881 Helsinki, Finland

* Corresponding author: karpas4{at}netvision.net.il

Received April 1, 2005, amended May 31, 2005, accepted June 4, 2005

The 234U/238U ratio in water, hair and nails samples was determined by multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) and inductively coupled plasma quadrupole mass spectrometry (ICP-QMS) and by alpha-spectrometry for the water samples only. A correlation of 0.99 was found between the two ICPMS methods and of 0.98 with alpha-spectrometry. The range of activity ratios was between 0.9 and 2.6 according to the MC-ICPMS measurements. The reproducibility of both ICPMS techniques was better than 4% for water samples containing 1 µg l–1 of uranium and a 234U/238U atom ratio of 54.9 x 10–6. Sample preparation for the ICPMS consisted of dilution of water samples containing >10 µg l–1 of uranium and measurement time was ~1 min, while alpha-spectrometry involved pre-concentration and separation of the uranium and counting times of 1000 min.


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