Homogeneous Distribution of
            <sup>26</sup>
            Al in the Solar System from the Mg Isotopic Composition of Chondrules

Johan Villeneuve, Marc Chaussidon, Guy Libourel

doi:10.1126/science.1173907

<jats:title>Solar Chronometer</jats:title> <jats:p> The use of the short-lived radioactive isotope <jats:sup>26</jats:sup> Al as a precise chronometer of early solar system processes relies on the assumption that it was uniformly distributed in the initial solar accretion disk. <jats:bold> Villeneuve <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="985" related-article-type="in-this-issue" vol="325" xlink:href="10.1126/science.1173907">985</jats:related-article> ; see the Perspective by <jats:bold> <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="5943" page="951" related-article-type="in-this-issue" vol="325" xlink:href="10.1126/science.1176730">Davis</jats:related-article> </jats:bold> ) validate this assumption on the basis of high-precision isotopic analyses of primitive meteoritic materials. Furthermore, chondrules—constituents of the most common type of meteorites and among the first materials to have formed in the solar system—formed episodically over a period of more than one million years. </jats:p>

Homogeneous Distribution of <sup>26</sup> Al in the Solar System from the Mg Isotopic Composition of Chondrules

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