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Science 6 September 1968:
Vol. 161. no. 3845, pp. 1009 - 1011
DOI: 10.1126/science.161.3845.1009
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Articles

Neutron Activation for Distinguishing Cascade Range Pyroclastics

Arthur A. Theisen 1, Glenn A. Borchardt 1, Moyle E. Harward 1, and Roman A. Schmitt 1

1 Oregon State University, Corvallis 97331

Neutron activation of glassy separates of volcanic ash resulted in 21 nuclides measurable with instrumental techniques. The relative activities of most of the nuclides distinguish samples from Mount Mazama, Newberry Crater, and Glacier Peak. The usefulness of the technique was assessed by comparing the values for known sources with those from fine ash of uncertain origin. The data strongly suggest Mount Mazama as the source.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)