Table of Contents
Physics Research International
Volume 2011, Article ID 705686, 8 pages
http://dx.doi.org/10.1155/2011/705686
Research Article

L X-Rays RYIED Oscillations and Proton-NMRD of Gd2O3 Nanoparticles

1Física e Unidade de Acelerador, Instituto Tecnológico e Nuclear, Estrada Nacional 10, 2686-953 Sacavém, Portugal
2Centro de Física Atómica da Universidade de Lisboa, Avenida Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal
3Centro de Física da Matéria Condensada da Universidade de Lisboa, Avenida Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal

Received 17 September 2010; Revised 4 January 2011; Accepted 8 March 2011

Academic Editor: Sergey B. Mirov

Copyright © 2011 A. Taborda et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Recently, it was shown that relative yields of X-rays induced by ion impact are not constant but depend on beam energy. In the framework of this problem, pellets of Gd2O3 and a Gd chelate, Gd-DOTA, as well as a 5 nm in diameter Gd2O3 nanoparticles dispersion on a polycarbonate Nuclepore filter, were studied. In this work, it is shown that after subtraction of known matrix effects, relative yield variations still present different patterns for Gd2O3 pellet and Gd2O3 nanoparticles. Proton NMRD 𝑇1(𝜔) data for Gd2O3 nanoparticles and Gd-DOTA water solutions published by Bridot et al. and Toth et al., respectively, were reproduced using a model for paramagnetic substances in water solutions and identical electronic relaxation times. The analysis of both techniques results points collective electron behaviour as the explanation for the different observations on X-ray data of Gd2O3 nanoparticles and bulk material.