Determination of long-lived radionuclides in concrete matrix by laser ablation inductively coupled plasma mass spectrometry |
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Authors: | M Gastel JS Becker G Küppers H-J Dietze |
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Institution: | Zentralabteilung für Chemische Analysen, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany |
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Abstract: | A laser ablation system using a Nd:YAG laser was coupled both to a quadrupole inductively coupled plasma (ICP) mass spectrometer and to a double-focusing sector field ICP mass spectrometer. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was applied for the determination of long-lived radionuclides in a concrete matrix. The investigated samples were two laboratory standards with a concrete matrix, which we doped with different long-lived radionuclides (e.g. 99Tc, 232Th, 233U, 237Np) from the ng g?1 to μ g?1 concentration range and an undoped concrete material (blank). Detection limits for long-lived radionuclides in the 10 ng g?1 range are reached for LA-ICP-MS using the quadrupole mass spectrometer. With double-focusing sector field ICP-MS, the limits of detection are in general one order of magnitude lower and reach the sub ng g?1 range for 233U and 237Np. A comparison of mass spectrometric results with those of neutron activation analysis on undoped concrete sample indicates that a semiquantitative determination of the concentrations of the minor and trace elements in the concrete matrix is possible with LA-ICP-MS without using a standard reference material. |
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Keywords: | Concrete matrix Double-focusing sector field ICP-MS Laboratory standards Laser ablation ICP-MS Long-lived radionuclides Quadrupole ICP-MS |
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