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- aggregation classification "C3".
- aggregation creator B31195.
- aggregation creator B31196.
- aggregation creator person.
- aggregation creator person.
- aggregation creator person.
- aggregation creator person.
- aggregation date "2008".
- aggregation hasFormat 683805.bibtex.
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- aggregation isPartOf urn:isbn:9789536690732.
- aggregation language "eng".
- aggregation publisher "Ruđer Bošković Institute".
- aggregation subject "Science General".
- aggregation title "Confocal XRF quantification procedures applied to the cometary matter returned by NASA's Stardust mission".
- aggregation abstract "Stardust is an interplanetary spacecraft launched on February 7, 1999, by NASA, whose primary purpose was to investigate the make up of comet Wild2 and its coma. The spacecraft was equipped with aerogel (highly porous silica foam with an extremely low density) collectors, in order to facilitate the capture of cometary dust particles. After the return of Stardust to Earth on January 15, 2006, the acquired samples were distributed among more than 150 researchers worldwide, including the X-Ray Micro-Spectroscopy and Imaging group of Ghent University (XMI-UGent) [1-3]. Each presented sample contains an elongated cavity (called track) produced by the impact and deceleration of a single comet coma particle through the aerogel. Multiple experiments were performed on such tracks and their terminal particle at the ESRF (beamline ID13) using several non-destructive X-ray based methods such as conventional 2D scanning nano X-ray fluorescence (XRF) and confocal nano XRF. The latter technique is characterized by the mounting of a polycapillary half-lens in front of the detector, thereby effectively reducing the volume defined by the intersection of the incoming beam and the sample to a volume defined by the acceptance of the polycapillary. The nanobeam of X-rays was produced by a linear Fresnel lens assembly which reduced the dimensions of the beam to the 100-200 nm level. The data has been evaluated using xmi-quant, a software-package dedicated to the evaluation of confocal XRF spectra, under development at our research group. This package includes an implementation of the fundamental parameter method allowing the modeling of the complex STARDUST particles. The presented quantitative results confirm the earlier findings concerning the presence of Ca-Al-rich inclusions in the cometary dust[2]. [1] D. S. Burnett, Science, 314(2006): 1709-1710 [2] D. Brownlee et al., Science, 314(2006): 1711-1716 [3] G. J. Flynn et al., Science, 314(2006): 1731-1735".
- aggregation authorList BK79064.
- aggregation endPage "22".
- aggregation startPage "22".
- aggregation isDescribedBy 683805.
- aggregation similarTo LU-683805.