Determination of 234U and 238U Activities in Soil by Liquid Scintillation and High-Resolution Alpha Spectrometry
Uranium is a radioactive element with a special presence in the rocks, waters, sediments, soils, and plants at the state of Chihuahua. The activity ratio of 238U/234U is used to explain the uranium transport by surface water and its deposition in arid environments. In this work, the activity concentration of natural U isotopes is determined by PERALS liquid scintillation and high-resolution alpha spectrometry (AS, Canberra camera 7401VR) in the Environmental Radiological Surveillance Laboratory (LVRA) at CIMAV, Chihuahua. Uranium is extracted from soils through the scintillating liquid extractor URAEX for PERALS, with chemical recovery (CR) of 80 - 85 %, and through the ion exchange resin UTEVA + electrode position by the Hallstadius method, with CR of 85 - 90 %, for AS. The procedures of 234U and 238U activity concentration (AC) determination in soils were validated by their application to the certified reference material IAEA-375. The resulting values were in the reference range of the certified or informative values. Both procedures were applied to 6 representative soil samples, with AC of the same order of magnitude or greater, and similar CR and compatible results. Both procedures are satisfactory for the purposes of LVRA research and in general.
M. Reyes-Cortés, L. Fuentes-Cobas, E. Torres-Moye, H. Esparza-Ponce and M.E. Montero-Cabrera, Mineralogy and Petrology 99, 121 (2010). https://doi.org/10.1007/s00710-009-0104-z
M. Reyes-Cortés, I.A. Reyes-Cortés, S. Espino Valdez, M. Rentería-Villalobos, J.C. Burillo Montúfar and M.E. Montero-Cabrera, Revista Mexicana de Ciencias Geológicas (In English: Mexican Journal of Geological Sciences) 29, 659 (2012).
S. Bazán Barron, Boletín de la Sociedad Geológica Mexicana 39, 25 (1978). http://dx.doi.org/10.18268/BSGM1978v39n2a3
B. Bourdon, S. Turner, G.M. Henderson and C.C. Lundstrom, Reviews in Mineralogy and Geochemistry 52, 1 (2003). https://doi.org/10.2113/0520001
X. Arzuaga, S.H. Rieth, A. Bathija and G.S. Cooper, Journal of Toxicology and Environmental Health, Part B 13, 527 (2010). https://doi.org/10.1080/10937404.2010.509015
M. Ivanovich and R.S. Harmon, Uranium-series disequilibrium: applications to earth, marine, and environmental sciences (Clarendon Press, Oxford, UK, 1992).
UNSCEAR, United Nations Scientific Committee on the Effects of Atomic Radiation. UNSCEAR 2000 Report to the General Assembly, with Scientific Annexes (United Nations, New York, USA, 2000).
UNSCEAR, United Nations Scientific Committee on the Effects of Atomic Radiation: Report of The Fifty-Seventh Session (United Nations, Publications, 2010).
IAEA, Reference sheet – Reference Material IAEA-375, Radionuclides and Trace Elements in Soil, (Analytical Quality Control Services (AQCS). Agency’s Laboratories, Seibersdorf. International Atomic Energy Agency, 2000), p. 4.
W.J. McDowell, Isotopic Uranium by PERALS, (ORDELA, Inc. USA., Oak Ridge, TN, 1994).
E.P. Horwitz, M.L. Dietz, R. Chiarizia, H. Diamond, A.M. Essling and D. Graczyk, Analytica Chimica Acta 266, 25 (1992). https://doi.org/10.1016/0003-2670(92)85276-C
L. Hallstadius, Nuclear Instruments and Methods in Physics Research 223, 266 (1984). https://doi.org/10.1016/0167-5087(84)90659-8
F. Chabaux, J. Riotte and O. Dequincey, U-ThRa Fractionation during Weathering and River Transport, edited by B. Bourdon, G.M. Henderson, C.C. Lundstrom and S.P. Turner, Uranium Series Geochemistry: Reviews in Mineralogy and Geochemistry, Vol. 52, Chapter 13, (Mineralogical Society of America, 2003), pp. 533-576.
Copyright (c) 2021 Caraveo-Castro Carmen del Rocío et al.
This work is licensed under a Creative Commons Attribution 4.0 International License.
View Legal Code of the above-mentioned license, https://creativecommons.org/licenses/by/4.0/legalcode
View Licence Deed here https://creativecommons.org/licenses/by/4.0/
|Journal of Nuclear Physics, Material Sciences, Radiation and Applications by Chitkara University Publications is licensed under a Creative Commons Attribution 4.0 International License.
Based on a work at https://jnp.chitkara.edu.in/