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Ernst Zinner and Donald Clayton converse at the conference *The Solar System and the Galaxy*, Tucson, January 1985. They discussed possibility of finding Stardust with secondary-ion mass spectrometry (SIMS). Clayton had predicted Stardust isotopic identifiers since 1975, and Zinner had developed SIMS capability to the point of detecting D-rich interplanetary dust particles, as he reported in Houston in 1984. Clayton's paper in Tucson (see the book) was on a local model for the 26Al gamma radiation that had just been detected.

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