Carbon-based thin films as a suitable alternative to metallized films for the preparation of radioactive sources.

Autor: Fernández-Martínez R; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT) (Spain), Av. Complutense 40, Madrid, 28040, Spain. Electronic address: rodolfo.fernandez@ciemat.es., Rodríguez-Tapiador MI; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT) (Spain), Av. Complutense 40, Madrid, 28040, Spain., Roteta M; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT) (Spain), Av. Complutense 40, Madrid, 28040, Spain., Pérez-Cadenas M; Dept. Química Inorgánica y Química Técnica, Facultad de Ciencias, UNED, Av. Esparta S/n, Las Rozas, 28232, Madrid, Spain., Del Rosario G; Universidad Rey Juan Carlos, Calle Tulipán S/n, 28933, Móstoles, Madrid, Spain., Pedrós J; Instituto de Sistemas Optoeléctronicos y Microtecnología & Departamento de Ingeniería Electrónica, E.T.S.I. de Telecomunicación, Universidad Politécnica de Madrid, Av. Complutense 30, Madrid, 28040, Spain., Rucandio I; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT) (Spain), Av. Complutense 40, Madrid, 28040, Spain.
Jazyk: angličtina
Zdroj: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] 2024 Oct; Vol. 212, pp. 111419. Date of Electronic Publication: 2024 Jul 04.
DOI: 10.1016/j.apradiso.2024.111419
Abstrakt: A new method for radionuclide labeling by the use of graphene thin films was previously presented. In this work, a comparison among low energy radioactive sources supported on carbonaceous thin films on polyvinyl chloride-polyvinyl acetate copolymer (VYNS), based on the use of aqueous solutions is investigated as a feasible alternative to the traditional metallized films avoiding the downside of the loss of many broken films. Graphene-based materials were prepared by both oxidation-exfoliation-reduction and direct graphite exfoliation routes. In addition, multiwalled carbon nanotubes (MWCNTs) thin films were also evaluated. The stability of both carbonaceous materials aqueous dispersions were studied by using ionic and non-ionic surfactants. Solid carbon-based materials were characterized by X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) whereas the colloidal nature of the aqueous dispersions was verified by the measurement of Tyndall effect and the morphology of thin films was evaluated by Scanning Electron Microscopy (SEM). 55 Fe solutions were used to prepare the radioactive sources on the thin films by quantitative drop deposition. The quality of spectra was measured in a pressurized proportional counter. Results showed a resolution higher than 0.9 keV for all the tested sources. However, MWCNT-based along with non-surfactant sources presented non-adequate escape peaks and low energy tails. On the contrary, all the graphene-based sources prepared using surfactants to stabilize aqueous solutions presented an energy resolution comparable to that of the metallized source while offering notable advantages in terms of cost efficiency and reliability of the as-prepared supports.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. None.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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