Publications

On the Quality Control for the Determination of Ultratrace-Level <sup>236</sup>U and 233<sup>233</sup>U in Environmental Samples by Accelerator Mass Spectrometry

Author(s)
Mu Lin, Jixin Qiao, Xiaolin Hou, Robin Golser, Karin Hain, Peter Steier
Abstract

Our recent attempt to determine ultratrace-level U-236 and U-233 in small-volume seawater samples was challenged by high and unstable procedure blanks in our environmental radioactivity laboratory, which used to be a spent fuel research facility. Through intercomparison experiments with different laboratories and background checks on the chemical reagents and laboratory dust, the resuspended U-bearing dust was identified as the dominating source of the U-236 and U-233 contamination. With the implementation of background control (especially dust control) measures, the procedure blanks and detection limits of U-236 and U-233 for the radiochemical separation procedure have been significantly improved by three orders of magnitudes. With well-controlled blanks, the analytical precision for U-236 and U-233 predominantly relies on the AMS counting statistics. Background check and dust control are strongly recommended before the analyses of environmental-level long-lived radionuclides (such as U-236 and U-233) that are conducted in the former or active nuclear facilities, even if clearance of radioactivity relevant for radioprotection was achieved.

Organisation(s)
Isotope Physics
External organisation(s)
Technical University of Denmark (DTU)
Journal
Analytical Chemistry
Volume
93
Pages
3362-3369
No. of pages
8
ISSN
0003-2700
DOI
https://doi.org/10.1021/acs.analchem.0c03623
Publication date
02-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
104002 Analytical chemistry, 103014 Nuclear physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/on-the-quality-control-for-the-determination-of-ultratracelevel-236u-and-233233u-in-environmental-samples-by-accelerator-mass-spectrometry(3928c430-62df-4ba7-9751-a991c5981572).html