Space resolved X-ray Fluorescence of archaeological painted pottery by using an X-ray pinhole camera with high energy and spatial resolution (Abstract/Comunicazione in atti di convegno)

Type
Label
  • Space resolved X-ray Fluorescence of archaeological painted pottery by using an X-ray pinhole camera with high energy and spatial resolution (Abstract/Comunicazione in atti di convegno) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • F.P. Romano1,2, G. Biondi1, S. Garraffo3, N. Masini1, L. Pappalardo1,2, F. Rizzo2 (2013)
    Space resolved X-ray Fluorescence of archaeological painted pottery by using an X-ray pinhole camera with high energy and spatial resolution
    in TECHNART 2013 Analytical Spectroscopy in Art and Archaeology, Amsterdam, 23-26 September 2013.
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • F.P. Romano1,2, G. Biondi1, S. Garraffo3, N. Masini1, L. Pappalardo1,2, F. Rizzo2 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • https://rijksmuseum.conference-services.net/programme.asp?conferenceID=3622&action=prog_list&session=27521 (literal)
Note
  • Comunicazione (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) IBAM-CNR, Catania, Italy (2) INFN-LNS, Catania, Italy (3) ITABC-CNR, Rome, Italy (literal)
Titolo
  • Space resolved X-ray Fluorescence of archaeological painted pottery by using an X-ray pinhole camera with high energy and spatial resolution (literal)
Abstract
  • The interest for using the non-destructive XRF micro-analysis to study cultural heritage and archaeological materials has grown rapidly in the last decade. Generally, micro-XRF measurements are performed by scanning the sample surface with X-ray beams of small dimensions. The advantages and the limits of using this experimental approach were largely investigated and demonstrated in a number of scientific works. The recent development of full-field X-ray cameras for performing the space-resolved XRF analysis of materials, represented a novel and promising method. In this work we present a new X-ray pinhole camera developed at the LANDIS laboratory of Catania (Italy), presenting high-energy and high-spatial resolution. The system consists of a 70 ?m pinhole-collimator coupled to a 13.3 mm2 CCD detector composed of 1024x1024 pixels with a lateral size of 13 ?m. The X-ray fluorescence is induced on the samples by using an ancillary X-ray source consisting of a medium-power X-ray tube operating at 40 kV and 1.5 mA and emitting a beam with a large divergence. The pinhole camera was designed in a compact set-up and it can be used in-situ. The X-ray images are obtained by using a multi-frames acquisition in single-photon counting. The off-line processing of the acquired frames allows to obtain the X-ray fluorescence spectra of the materials under investigation. The energy resolution of the system measured at 5.9 keV is 155 eV. The XRF spectra contain spatial information and they are used to map the elemental distribution in the illuminated samples. The spatial resolution of the images was investigated at different magnification values; it resulted to be less than 100 ?m at magnifications larger than 3x. The X-ray camera operates in a coaxial geometry; sample-pinhole and pinhole-CCD distances can be fixed depending on the samples under investigation. An area up to 4x4 cm2 can be analyzed in a single measurement. The time necessary to get sufficient statistics for high-quality images ranges from 1 hours (small dimension samples) to 5 hours (large dimension samples). As a first application, the X-ray pinhole camera was used for the space-resolved XRF analysis of painted pottery of archeological interest. The investigated samples belong to different cultures and are dated to different historical periods. The analysis was performed in combination with other non-destructive techniques available at the LANDIS laboratory (namely the ?XRD, the low-energy ?XRF and the PIXE-alpha portable techniques). Compositional and mineralogical results of some representative cases are presented and discussed. (literal)
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