Analytical dual-energy microtomography: A new method for obtaining three-dimensional mineral phase images and its application to Hayabusa samples

A. Tsuchiyama, T. Nakano, K. Uesugi, M. Uesugi, A. Takeuchi, Y. Suzuki, R. Noguchi, T. Matsumoto, J. Matsuno, T. Nagano, Y. Imai, T. Nakamura, T. Ogami, T. Noguchi, M. Abe, T. Yada, A. Fujimura

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

We developed a novel technique called "analytical dual-energy microtomography" that uses the linear attenuation coefficients (LACs) of minerals at two different X-ray energies to nondestructively obtain three-dimensional (3D) images of mineral distribution in materials such as rock specimens. The two energies are above and below the absorption edge energy of an abundant element, which we call the "index element". The chemical compositions of minerals forming solid solution series can also be measured. The optimal size of a sample is of the order of the inverse of the LAC values at the X-ray energies used. We used synchrotron-based microtomography with an effective spatial resolution of >200. nm to apply this method to small particles (30-180. μm) collected from the surface of asteroid 25143 Itokawa by the Hayabusa mission of the Japan Aerospace Exploration Agency (JAXA). A 3D distribution of the minerals was successively obtained by imaging the samples at X-ray energies of 7 and 8. keV, using Fe as the index element (the K-absorption edge of Fe is 7.11. keV). The optimal sample size in this case is of the order of 50. μm. The chemical compositions of the minerals, including the Fe/Mg ratios of ferromagnesian minerals and the Na/Ca ratios of plagioclase, were measured. This new method is potentially applicable to other small samples such as cosmic dust, lunar regolith, cometary dust (recovered by the Stardust mission of the National Aeronautics and Space Administration [NASA]), and samples from extraterrestrial bodies (those from future sample return missions such as the JAXA Hayabusa2 mission and the NASA OSIRIS-REx mission), although limitations exist for unequilibrated samples. Further, this technique is generally suited for studying materials in multicomponent systems with multiple phases across several research fields.

Original languageEnglish
Pages (from-to)5-16
Number of pages12
JournalGeochimica et Cosmochimica Acta
Volume116
DOIs
Publication statusPublished - Sep 1 2013
Externally publishedYes

Fingerprint

Minerals
mineral
energy
X rays
Dust
NASA
chemical composition
OSIRIS
dust
Asteroids
regolith
Chemical analysis
Synchrotrons
solid solution
Chemical elements
asteroid
method
Solid solutions
analytical method
plagioclase

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Cite this

Analytical dual-energy microtomography : A new method for obtaining three-dimensional mineral phase images and its application to Hayabusa samples. / Tsuchiyama, A.; Nakano, T.; Uesugi, K.; Uesugi, M.; Takeuchi, A.; Suzuki, Y.; Noguchi, R.; Matsumoto, T.; Matsuno, J.; Nagano, T.; Imai, Y.; Nakamura, T.; Ogami, T.; Noguchi, T.; Abe, M.; Yada, T.; Fujimura, A.

In: Geochimica et Cosmochimica Acta, Vol. 116, 01.09.2013, p. 5-16.

Research output: Contribution to journalArticle

Tsuchiyama, A, Nakano, T, Uesugi, K, Uesugi, M, Takeuchi, A, Suzuki, Y, Noguchi, R, Matsumoto, T, Matsuno, J, Nagano, T, Imai, Y, Nakamura, T, Ogami, T, Noguchi, T, Abe, M, Yada, T & Fujimura, A 2013, 'Analytical dual-energy microtomography: A new method for obtaining three-dimensional mineral phase images and its application to Hayabusa samples', Geochimica et Cosmochimica Acta, vol. 116, pp. 5-16. https://doi.org/10.1016/j.gca.2012.11.036
Tsuchiyama, A. ; Nakano, T. ; Uesugi, K. ; Uesugi, M. ; Takeuchi, A. ; Suzuki, Y. ; Noguchi, R. ; Matsumoto, T. ; Matsuno, J. ; Nagano, T. ; Imai, Y. ; Nakamura, T. ; Ogami, T. ; Noguchi, T. ; Abe, M. ; Yada, T. ; Fujimura, A. / Analytical dual-energy microtomography : A new method for obtaining three-dimensional mineral phase images and its application to Hayabusa samples. In: Geochimica et Cosmochimica Acta. 2013 ; Vol. 116. pp. 5-16.
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AU - Uesugi, M.

AU - Takeuchi, A.

AU - Suzuki, Y.

AU - Noguchi, R.

AU - Matsumoto, T.

AU - Matsuno, J.

AU - Nagano, T.

AU - Imai, Y.

AU - Nakamura, T.

AU - Ogami, T.

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