Table of Contents
ISRN Nanotechnology
Volume 2013, Article ID 865283, 5 pages
Research Article

Evaluation of the X-Ray Absorption by Gold Nanoparticles Solutions

1Universidade de São Paulo, Instituto de Física, Departamento de Física Nuclear, Cidade Universitária, 05508-090 São Paulo, SP, Brazil
2Universidade Federal de São Paulo, Departamento de Ciências Exatas e da Terra, Rua Prof. Artur Riedel 275, 09972-270 Diadema, SP, Brazil

Received 14 January 2013; Accepted 14 February 2013

Academic Editors: D. R. Chen, C.-L. Hsu, and D. K. Sarker

Copyright © 2013 R. Künzel 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.


The increase in the X-ray absorption due to gold nanoparticles was investigated by using aqueous solutions containing gold (Au) nanoparticles. A sample with 15 nm in size nanoparticles and 0.5 mg/mL gold concentration and a distilled water sample were used. Transmitted X-ray beams through the samples were registered with a CdTe detector and with an ionization chamber. Results show an enhancement in the X-ray absorption in the range 20%–6% for beams generated from 20 kV to 120 kV tube voltages, respectively. Results show that the use of gold nanoparticles, even at low concentrations, should result in a significant contrast enhancement for low-energy X-ray beams.