Rapid Instrumental Nuclear Activation Analysis of Rocks, Cements and Meteorites

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Abstract
The experimental set‐up and the method for γ‐spectrum analysis as used in the activation analysis of rocks, cements and meteorites by reactor neutrons are discussed. Rapid nondestructive simultareous determination of several elements is possible. Fractional percent reproducibility is possible for Al, Na and Mn; the determination of Ca, Mg and V in the samples studied us influenced by the Al‐ and Mn‐content, but reproducibility approaches 1% in favorable cases. Accuracy is generally within the limits set by the reproducibility. The minimum weight of the sample is small (10–40 mg), but the grain‐size must be below 150 mesh; in the case of meteorites, a grain‐size effect has been demonstrated. Representative results for several standard rocks and cements, for 7 L‐chondrites, 2 hyperstene achondrites and separate mineral phases of the Elenovka chondrite are given.
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