Neutron activation analysis of a particle returned from asteroid Itokawa

M. Ebihara; S. Sekimoto; N. Shirai; Y. Hamajima; M. Yamamoto; K. Kumagai; Y. Oura; T. R. Ireland; F. Kitajima; K. Nagao; T. Nakamura; H. Naraoka; T. Noguchi; R. Okazaki; A. Tsuchiyama; M. Uesugi; H. Yurimoto; M. E. Zolensky; M. Abe; A. Fujimura; T. Mukai; Y. Yada

doi:10.1126/science.1207865

Neutron activation analysis of a particle returned from asteroid Itokawa

M. Ebihara^*, S. Sekimoto, N. Shirai, Y. Hamajima, M. Yamamoto, K. Kumagai, Y. Oura, T. R. Ireland, F. Kitajima, K. Nagao, T. Nakamura, H. Naraoka, T. Noguchi, R. Okazaki, A. Tsuchiyama, M. Uesugi, H. Yurimoto, M. E. Zolensky, M. Abe, A. FujimuraT. Mukai, Y. Yada

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

53 Citations (Scopus)

Abstract

A single grain (~3 micrograms) returned by the Hayabusa spacecraft was analyzed by neutron activation analysis. This grain is mainly composed of olivine with minor amounts of plagioclase, troilite, and metal. Our results establish that the Itokawa sample has similar chemical characteristics (iron/scandium and nickel/cobalt ratios) to chondrites, confirming that this grain is extraterrestrial in origin and has primitive chemical compositions. Estimated iridium/nickel and iridium/cobalt ratios for metal in the Itokawa samples are about five times lower than CI carbonaceous chondrite values. A similar depletion of iridium was observed in chondrule metals of ordinary chondrites. These metals must have condensed from the nebular where refractory siderophile elements already condensed and were segregated.

Original language	English
Pages (from-to)	1119-1121
Number of pages	3
Journal	Science
Volume	333
Issue number	6046
DOIs	https://doi.org/10.1126/science.1207865
Publication status	Published - 2011 Aug 26
Externally published	Yes

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Ebihara, M., Sekimoto, S., Shirai, N., Hamajima, Y., Yamamoto, M., Kumagai, K., Oura, Y., Ireland, T. R., Kitajima, F., Nagao, K., Nakamura, T., Naraoka, H., Noguchi, T., Okazaki, R., Tsuchiyama, A., Uesugi, M., Yurimoto, H., Zolensky, M. E., Abe, M., ... Yada, Y. (2011). Neutron activation analysis of a particle returned from asteroid Itokawa. Science, 333(6046), 1119-1121. https://doi.org/10.1126/science.1207865

Ebihara, M, Sekimoto, S, Shirai, N, Hamajima, Y, Yamamoto, M, Kumagai, K, Oura, Y, Ireland, TR, Kitajima, F, Nagao, K, Nakamura, T, Naraoka, H, Noguchi, T, Okazaki, R, Tsuchiyama, A, Uesugi, M, Yurimoto, H, Zolensky, ME, Abe, M, Fujimura, A, Mukai, T & Yada, Y 2011, 'Neutron activation analysis of a particle returned from asteroid Itokawa', Science, vol. 333, no. 6046, pp. 1119-1121. https://doi.org/10.1126/science.1207865

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title = "Neutron activation analysis of a particle returned from asteroid Itokawa",

abstract = "A single grain (~3 micrograms) returned by the Hayabusa spacecraft was analyzed by neutron activation analysis. This grain is mainly composed of olivine with minor amounts of plagioclase, troilite, and metal. Our results establish that the Itokawa sample has similar chemical characteristics (iron/scandium and nickel/cobalt ratios) to chondrites, confirming that this grain is extraterrestrial in origin and has primitive chemical compositions. Estimated iridium/nickel and iridium/cobalt ratios for metal in the Itokawa samples are about five times lower than CI carbonaceous chondrite values. A similar depletion of iridium was observed in chondrule metals of ordinary chondrites. These metals must have condensed from the nebular where refractory siderophile elements already condensed and were segregated.",

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doi = "10.1126/science.1207865",

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AU - Ebihara, M.

AU - Sekimoto, S.

AU - Shirai, N.

AU - Hamajima, Y.

AU - Yamamoto, M.

AU - Kumagai, K.

AU - Oura, Y.

AU - Ireland, T. R.

AU - Kitajima, F.

AU - Nagao, K.

AU - Nakamura, T.

AU - Naraoka, H.

AU - Noguchi, T.

AU - Okazaki, R.

AU - Tsuchiyama, A.

AU - Uesugi, M.

AU - Yurimoto, H.

AU - Zolensky, M. E.

AU - Abe, M.

AU - Fujimura, A.

AU - Mukai, T.

AU - Yada, Y.

PY - 2011/8/26

Y1 - 2011/8/26

N2 - A single grain (~3 micrograms) returned by the Hayabusa spacecraft was analyzed by neutron activation analysis. This grain is mainly composed of olivine with minor amounts of plagioclase, troilite, and metal. Our results establish that the Itokawa sample has similar chemical characteristics (iron/scandium and nickel/cobalt ratios) to chondrites, confirming that this grain is extraterrestrial in origin and has primitive chemical compositions. Estimated iridium/nickel and iridium/cobalt ratios for metal in the Itokawa samples are about five times lower than CI carbonaceous chondrite values. A similar depletion of iridium was observed in chondrule metals of ordinary chondrites. These metals must have condensed from the nebular where refractory siderophile elements already condensed and were segregated.

AB - A single grain (~3 micrograms) returned by the Hayabusa spacecraft was analyzed by neutron activation analysis. This grain is mainly composed of olivine with minor amounts of plagioclase, troilite, and metal. Our results establish that the Itokawa sample has similar chemical characteristics (iron/scandium and nickel/cobalt ratios) to chondrites, confirming that this grain is extraterrestrial in origin and has primitive chemical compositions. Estimated iridium/nickel and iridium/cobalt ratios for metal in the Itokawa samples are about five times lower than CI carbonaceous chondrite values. A similar depletion of iridium was observed in chondrule metals of ordinary chondrites. These metals must have condensed from the nebular where refractory siderophile elements already condensed and were segregated.

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Neutron activation analysis of a particle returned from asteroid Itokawa

Abstract

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