Determination of gadolinium and erbium in Gd2O3 and Er2O3 nanoparticle samples by neutron activation analysis
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2017
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INTERNATIONAL TOPICAL MEETING ON INDUSTRIAL RADIATION AND RADIOISOTOPE MEASUREMENT APPLICATIONS, 10th
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Along these years the applications of nanoparticles (NPs) in medicine as
radiosensitizers have been widely studied, so several methods for its syntheses are
presented. One of the best synthesis methods for this application is by thermal
decomposition, which produces small NPs size (3-5 nm) with a narrow size distribution.
On the other hand NPs synthetized by this method are covered by an organic material,
hence making their mass measurement impossible by conventional means. In this study
neutron activation analysis (NAA) was applied to determine Gd and Er concentrations in
their NP oxides. The analysis of NPs composition is not commonly carried out. However
these determinations are of great importance when the NPs are used in
radiosensitization tests and magnetization measurements. NPs were synthetized by the
method of thermal decomposition, which consisted in adding and mixing Gd and Er
acetate in an organic solution by stirring and heating at high temperature (about 573 K)
for about six hours. After cooling at room temperature the solution was centrifuged to
obtain the NPs that were separated from the liquid. For NAA about 5 mg of
post-synthesis and 873 K annealed samples of Gd2O3-NP and Er2O3-NP were
irradiated together with their respective element standard. One-minute irradiations were
carried out at the IEA-R1 research nuclear reactor. Element concentrations were
determined by measuring 159Gd and 171Er gamma ray activities (energy of 363.56 keV
and 308.3 keV respectively). Concentration of (19.88 ± 0.43) % of Gd and (23.53 ±
0.82) % of Er were obtained in the Gd2O3-NP and Er2O3-NP samples, respectively.
These results are useful and have been used to establish experimental conditions for
NPs magnetization and irradiation in radiotherapy beams for dose enhancement factor
determination.
Como referenciar
CORREA, E.L.; BOSCH-SANTOS, B.; SAIKI, M.; NASCIMENTO, N.M.; EFFENBERGER, F.B.; CARBONARI, A.W.; POTIENS, M.P.A. Determination of gadolinium and erbium in Gd2O3 and Er2O3 nanoparticle samples by neutron activation analysis. In: INTERNATIONAL TOPICAL MEETING ON INDUSTRIAL RADIATION AND RADIOISOTOPE MEASUREMENT APPLICATIONS, 10th, July 09-13, 2017, Chicago, IL, USA. Abstract... p. 27-28. Disponível em: http://repositorio.ipen.br/handle/123456789/27949. Acesso em: 28 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.