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Studies on Isotopic Ratios of Osmium and Iridium in Cosmic Spherules Using Instrumental Neutron Activation Analysis

Published online by Cambridge University Press:  12 April 2016

Kazuo Yamakoshi  and
Ken’ichi Nogami
Kazuo Yamakoshi
Affiliation:
Institute for Cosmic Ray Research Univ. Tokyo, Tanashi Tokyo 188Japan
Ken’ichi Nogami
Affiliation:
Phys.Lab.Dokkyo Univ.School Medicine, Mibu Shimotsugagun Tochigi 321-2Japan

Abstract

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Studies on isotopic anomalies in cosmic meteoroids are expected to reveal the features of nuclear synthesis in various phases of star-evolution. The respective isotopes of noble metals had been produced through various reaction processes as well as in various regions of star-eruptions. However, isotopic anomalies of 0s in extremely refractory inclusions of primordial carbonaceous chondrites have not been found up to now. In this work, isotopic ratios of the elements having high condensation temperatures, such as 0s and Ir, in the cosmic spherules are examined using instrumental neutron activation analysis(INAA).

Type
Interplanetary Dust: Physical and Chemical Analysis
Information
International Astronomical Union Colloquium , Volume 126: Origin and Evolution of Interplanetary Dust , 1991 , pp. 109 - 112
Copyright
Copyright © Kluwer 1991

References

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Yamakoshi, K 1982 Proc.15th ISAS Lunar and Planet.Symposium 326 Google Scholar