Determination of Ra-226 in aqueous solutions via sorption on thin films and alpha-spectrometry
| dc.contributor.author | Karamanis, D. | en |
| dc.contributor.author | Ioannides, K. G. | en |
| dc.contributor.author | Stamoulis, K. C. | en |
| dc.date.accessioned | 2015-11-24T18:30:29Z | |
| dc.date.available | 2015-11-24T18:30:29Z | |
| dc.identifier.issn | 0003-2670 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/16374 | |
| dc.rights | Default Licence | - |
| dc.subject | radium | en |
| dc.subject | manganese dioxide thin films | en |
| dc.subject | alpha-spectrometry | en |
| dc.subject | water | en |
| dc.subject | sorption | en |
| dc.subject | manganese oxide | en |
| dc.subject | natural-waters | en |
| dc.subject | radium isotopes | en |
| dc.subject | icp-ms | en |
| dc.subject | samples | en |
| dc.subject | birnessite | en |
| dc.subject | behavior | en |
| dc.subject | preconcentration | en |
| dc.subject | nanocomposites | en |
| dc.subject | groundwater | en |
| dc.title | Determination of Ra-226 in aqueous solutions via sorption on thin films and alpha-spectrometry | en |
| heal.abstract | 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. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | DOI 10.1016/j.aca.2006.03.024 | - |
| heal.identifier.secondary | <Go to ISI>://000239524800045 | - |
| heal.identifier.secondary | http://ac.els-cdn.com/S0003267006005538/1-s2.0-S0003267006005538-main.pdf?_tid=a45caa2b3c09ec77520a91a83552e379&acdnat=1334223046_0822acff2c997bcfbacea4d80e70e105 | - |
| heal.journalName | Analytica Chimica Acta | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2006 | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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