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Title: Origin of Spherule Samples Recovered from Antarctic Ice Sheet-Terrestrial or Extraterrestrial?
Authors: Sekimoto, Shun  kyouindb  KAKEN_id
Kobayashi, Takayuki
Takamiya, Koichi
Ebihara, Mitsuru
Shibata, Seiichi
Author's alias: 関本, 俊
髙宮, 幸一
Keywords: Antarctic
Extraterrestrial
Iridium
Neutron Activation Analysis
Spherule
Issue Date: 1-Apr-2016
Publisher: Elsevier Korea LLC
Journal title: Nuclear Engineering and Technology
Volume: 48
Issue: 2
Start page: 293
End page: 298
Abstract: Thirty-eight spherules from the Antarctic ice sheet were analyzed using neutron activation analysis under two different conditions to investigate their origin. In almost all of these spherules, the contents of iron, cobalt, and manganese were determined to be 31% to 88%, 17 mg/kg to 810 mg/kg, and 0.017% to 7%, respectively. A detectable iridium content of 0.84 mg/kg was found in only one spherule, which was judged to be extraterrestrial in origin. A comparison of elemental compositions of the Antarctic spherules analyzed in this study with those of deep-sea sediment spherules and those of terrestrial materials revealed that most of the Antarctic spherules except for the sample in which iridium was detected could not be identified as extraterrestrial in origin.
Rights: © 2016, Published by Elsevier Korea LLC on behalf of Korean Nuclear Society. This is an open access article under the CC BY-NC-ND license http://creativecommons.org/licenses/by-nc-nd/4.0/)
URI: http://hdl.handle.net/2433/217399
DOI(Published Version): 10.1016/j.net.2016.02.004
Appears in Collections:Journal Articles

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