Determination of Ra-226 in aqueous solutions via sorption on thin films and alpha-spectrometry
Φόρτωση...
Ημερομηνία
Συγγραφείς
Karamanis, D.
Ioannides, K. G.
Stamoulis, K. C.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Analytica Chimica Acta
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
An improved spectrometric method to determine the Ra-226 activity in aqueous solutions is described. The method involves two stages, a preconcentration stage of Ra-226 sorption onto a thin manganese layer and a measurement stage using alpha-spectrometry. Manganese oxide thin films were prepared and characterized with X-ray diffraction (XRD) and X-ray fluorescence (XRF) analyses. The thin films were found to follow the XRD patterns and chemical formula of the K-bimessite layered exchanger. The preconcentration of radium was studied relative to the initial radium concentration, pH and salt concentrations. The preconcentration kinetics was studied as a function of manganese surface, solution volume and salt concentration. Extensive Monte Carlo calculations were performed to optimise the detection of alpha-particles. In this way, the thin film preparation procedure as well as the radium sorption and the measurement conditions were optimised and detection limits lower than 0.5 mBq L-1 were obtained for 2 d of procedure completion. The method was validated with IAEA standards and it was applied for the determination of Ra-226 in bottled waters and also wastewaters from the major thermoelectric plant in Greece. Moreover, the Ra-226 distribution coefficients (K-d) of two differently prepared powder manganese oxides, a crystalline silicotitanate and an aluminium-pillared montmorillonite were determined by gamma-spectrometry. Ra-226 sorption experiments on silicotitanate thin films were performed and improvements in resolution and reduction of exposure time were observed. (c) 2006 Elsevier B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
radium, manganese dioxide thin films, alpha-spectrometry, water, sorption, manganese oxide, natural-waters, radium isotopes, icp-ms, samples, birnessite, behavior, preconcentration, nanocomposites, groundwater
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000239524800045
http://ac.els-cdn.com/S0003267006005538/1-s2.0-S0003267006005538-main.pdf?_tid=a45caa2b3c09ec77520a91a83552e379&acdnat=1334223046_0822acff2c997bcfbacea4d80e70e105
http://ac.els-cdn.com/S0003267006005538/1-s2.0-S0003267006005538-main.pdf?_tid=a45caa2b3c09ec77520a91a83552e379&acdnat=1334223046_0822acff2c997bcfbacea4d80e70e105
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών