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Enhancing the activation of silicon carbide tracer particles for PEPT applications using gas-phase deposition of alumina at room temperature and atmospheric pressure

Valdesueiro, D, Garcia Trinanes, P, Meesters, GMH, Kreutzer, MT, Gargiuli, J, Leadbeater, T, Parker, DJ, Seville, J and van Ommen, R (2015) Enhancing the activation of silicon carbide tracer particles for PEPT applications using gas-phase deposition of alumina at room temperature and atmospheric pressure Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. (In Press)

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Abstract

We have enhanced the radio-activation efficiency of SiC (silicon carbide) particles, which by nature have a poor affinity towards 18F ions, to be employed as tracers in studies using PEPT (Positron Emission Particle Tracking). The resulting SiC-Al2O3 core-shell structure shows a good labelling efficiency, comparable to γ-Al2O3 tracer particles, which are commonly used in PEPT. The coating of the SiC particles was carried at 27 ± 3 °C and 1 bar in a fluidized bed reactor, using trimethyl aluminium and water as precursors, by a gas phase technique similar to atomic layer deposition. The thickness of the alumina films, which ranged from 5 to 500 nm, was measured by elemental analysis and confirmed with FIB-TEM (focus ion beam – transmission electron microscope), obtaining consistent results from both techniques. By depositing such a thin film of alumina, properties that influence the hydrodynamic behaviour of the SiC particles, such as size, shape and density, are hardly altered, ensuring that the tracer particle shows the same flow behaviour as the other particles. The paper describes a general method to improve the activation efficiency of materials, which can be applied for the production of tracer particles for many other applications too.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences
Authors :
AuthorsEmailORCID
Valdesueiro, DUNSPECIFIEDUNSPECIFIED
Garcia Trinanes, PUNSPECIFIEDUNSPECIFIED
Meesters, GMHUNSPECIFIEDUNSPECIFIED
Kreutzer, MTUNSPECIFIEDUNSPECIFIED
Gargiuli, JUNSPECIFIEDUNSPECIFIED
Leadbeater, TUNSPECIFIEDUNSPECIFIED
Parker, DJUNSPECIFIEDUNSPECIFIED
Seville, JUNSPECIFIEDUNSPECIFIED
van Ommen, RUNSPECIFIEDUNSPECIFIED
Date : 6 November 2015
Identification Number : 10.1016/j.nima.2015.10.111
Additional Information : © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Depositing User : Symplectic Elements
Date Deposited : 10 Nov 2015 19:10
Last Modified : 10 Nov 2016 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/809133

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