Logotipo Nome do projecto Image1 Image2 Image3 Image4

Presentation

1. Main Goals

Image

The external microbeam analytical end-station is an extension of the existing microprobe, in operation since 1999. It can be applied to the resolution of problems in the field of the sciences of art work and archaeology.

The information that can be obtained (identification and quantification of major, minor and trace elements; distribution and profiles concentration) is important to:

  • Restoration processes (original materials identification);
  • Surface treatments;
  • Degradation and corrosion surfaces studies;
  • Elemental concentration comparison with coeval objects, etc.

The microbeam allows us to obtain this information in almost all kind of objects (metals, ceramics or glass) without sampling.

Potencial users:

  • Institutions from the field of Cultural Heritage Sciences, Archaeometry or Conservation;
  • Museums;
  • Private and individual users.

For further information, see PIXE for cultural heritage (940 Kb, pdf).


2. Equipment/Infrastructures

The available equipment at the Ion bean laboratory (IBL) of the Unit of Physics and Accelerators associated to the 2,5 MV Van de Graaff Accelerator are the following:

2.1. Oxford Microbeams® Ionic Microssonda;
2.2. External microbeam analytical end-station.

For further information, see PIXE for cultural heritage (940 Kb, pdf).


3. Installation Schema

Schema

 Schema plan (see red line):

Localização da microssinda iónica

4. Technical Services

If you are interested in study of objects using the microbeam, please contact us.

There are several actions designed to support the educational system at various levels, particularly in the graduate and post-graduate areas. Additionally, there are activities and support to schools, for example the Ciência Viva program (the contribution of the Portuguese Ministry of Science and Technology to the promotion of a scientific and technological culture among the Portuguese population).

4.1. Contact Details:

E-mail or fax: Victoria Corregidor, Luis Cerqueira Alves and/or Rui Coelho da Silva.

4.2. Analytical Techniques available:

  • PIXE (Particle Induced X-ray Emission);
  • PIGE (Particle Induced Gamma-ray Emission);
  • RBS (Rutherford Backscattering Spectrometry);
  • IBIL (Ion Beam Induced Luminescence).

5. The Microfex Project

MicroFex is R&D Project co-financed by Fundação para a Ciência e a Tecnologia (FCT) and FEDER, through POCI 2010 Program.

The project was focused on bringing the capabilities of the analytical ion microprobe to other fields of study, namely those that by their own nature involve the characterization of objects or artefacts that cannot be altered by the analytical methods employed cannot be confined to vacuum chambers, etc. This is a problem of frequently difficult resolution since the conventional analytical techniques usually employed either have poor or even none at all the spatial resolution – laterally and in depth – necessary for the analysis of compositionally structured surfaces, or demand previous preparation that induces permanent changes in the objects to be analysed.

Furthermore, the required preparation often induces changes that mask or destroy the pristine condition of the sample material prior to its extraction. Recurring to a nuclear microprobe that combines beam focusing to micrometer dimensions and rastering, with the synchronous collection of data from the IBA techniques installed – namely PIXE, RBS, etc. – constitutes a powerful tool to overcome those obstacles. In the ion microprobe, the IBA techniques allow extraction of reliable composition information, with very low detection limits, that show in the form of structurally related composition maps having lateral spatial resolution in the micrometer range.

5.1. Funding

R&D Project co-financed by Fundação para a Ciência e a Tecnologia (FCT) and FEDER, through POCI 2010 Program:

  • Name: To Install a Microbeam End-station at the Nuclear Microprobe Facility (MicroFEx).
  • Project Reference: POCI/CTM/60685/2004.
  • Coordination Researcher: Rui Manuel Coelho da Silva.
  • Promoted Institution: Instituto Tecnológico e Nuclear (ITN/MCTES).
  • Starting Date: 04-07-2005.
  • Ending Date: 31-12-2008.
  • Total Funding: 76.000,00 €.
  • URL: http://www.itn.pt/projs/microfex.

5.2. Final Results

Bringing the capabilities of the analytical ion microprobe to other fields of study, namely those that by their own nature involve the characterization of objects or artefacts that cannot be altered by the analytical methods employed cannot be confined to vacuum chambers, etc. This is a problem of frequently difficult resolution since the conventional analytical techniques usually employed either have poor or even none at all the spatial resolution – laterally and in depth – necessary for the analysis of compositionally structured surfaces, or demand previous preparation that induces permanent changes in the objects to be analysed.

Furthermore, the required preparation often induces changes that mask or destroy the pristine condition of the sample material prior to its extraction. Recurring to a nuclear microprobe that combines beam focusing to micrometer dimensions and rastering, with the synchronous collection of data from the IBA techniques installed – namely PIXE, RBS, etc. – constitutes a powerful tool to overcome those obstacles. In the ion microprobe, the IBA techniques allow extraction of reliable composition information, with very low detection limits, that show in the form of structurally related composition maps having lateral spatial resolution in the micrometer range.

In the scope of this project we aim at installing an external microbeam at the nuclear microprobe, with the capability of delivering a lateral resolution of tens of micrometers.


- - - - - - - - - - Team  Members - - - - - - - - - -