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Toyonaka, Japan

Uesugi M.,1 Machikaneyama | Uesugi K.,Japan Synchrotron Radiation Research Institute | Oka M.,1 Machikaneyama
Earth and Planetary Science Letters | Year: 2010

A method for the non-destructive observation of extraterrestrial materials using X-ray computed tomography (CT) is discussed. This method allows to image texture of objects in meteorites without destructive methods of sample preparation. Quantitative analysis of X-ray CT data was achieved by measuring X-ray linear attenuation coefficients (LACs). The histogram of the LAC value provides information regarding the meteorite structure, such as the internal components and their chemical composition. The change of the signal-to-noise ratio (S/N ratio) of CT data is investigated by optimizing the CT measurement conditions. These results form an important baseline for the initial analysis of extraterrestrial materials. © 2010 Elsevier B.V. Source


Uesugi M.,Japan Aerospace Exploration Agency | Uesugi K.,Japan Synchrotron Radiation Research Institute | Takeuchi A.,Japan Synchrotron Radiation Research Institute | Suzuki Y.,Japan Synchrotron Radiation Research Institute | And 2 more authors.
Geochimica et Cosmochimica Acta | Year: 2013

Carbonaceous chondrites were observed by synchrotron radiation X-ray computed tomography (SR-CT) three-dimensionally. We analyzed the chemical composition of the components of the carbonaceous chondrites, such as chondrules, matrix and iron inclusions, from the linear attenuation coefficient (LAC) of X-rays. Histograms of the LAC were used for the analysis of chemical composition of the internal material, and we could find a clear relation of the compositions between the chondrules and matrix. We also analyzed the size distribution of low-Fe inclusions (chondrules) using image processing of CT images. Cumulative size distribution of chondrules shows power-law distribution, and slopes of the distribution changed for different chondrite classes. Results of these analyses show that the chondrule and matrix would have formed from the same precursor, and were incorporated into the parent bodies without large scale mixing in the solar nebula.The method will also provide important information for the analysis of future sample return missions. Our examinations demonstrate great potential of the quantitative determination of chondrite class nondestructively, by SR-CT. © 2012 Elsevier Ltd. Source

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