Neutron capture prompt gamma-ray analysis of stratospheric and groundfall ASH following the MT. ST. Helens eruption of May 18, 1980

D. Anderson; J. Phelan; T. Vossler; W. Zoller

doi:10.1007/bf02516140

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 71: Issue 1-2

Neutron capture prompt gamma-ray analysis of stratospheric and groundfall ASH following the MT. ST. Helens eruption of May 18, 1980

Authors:

D. Anderson

D. Anderson University of Maryland College Park Department of Chemistry 20742 Maryland USA

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J. Phelan

J. Phelan University of Maryland College Park Department of Chemistry 20742 Maryland USA

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T. Vossler

T. Vossler University of Maryland College Park Department of Chemistry 20742 Maryland USA

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W. Zoller

W. Zoller University of Maryland College Park Department of Chemistry 20742 Maryland USA

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Pages:: 47–58

Online Publication Date:: 09 Jan 2007

Publication Date:: 01 Mar 1982

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02516140

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Abstract

Neutron-capture prompt γ-ray analysis (PGAA) is an exceptionally good method for the determination of the major and minor elements Na, Mg, Al, Si, K, Ca, Ti, Mn and Fe in most geological matrices. The trace elements H, B, S, Cl, Cd, Sm and Gd can often be readily measured in most geological materials. This technique was applied to volcanic ash samples collected in Washington and Montana by various groups following the May 18 eruption of the Mt. St. Helens volcano, as well as to several particulate samples collected at altitudes between 13 and 18 km by a NASA U-2 research aircraft. Groundfall ash samples show distinct elemental variations versus distance from the volcano. For example, Si/Al ratios vary from 2.85 near the volcano to about 3.70 at≽400 km to the east. Samples collected sequentially at a given location (Almira, Washington) also exhibit variations in the elemental ratios. These sequential samples were also subjected to leaching studies to determine soluble B, Cl and S. On the average, PGAA is able to account for 99.4±1.7% of the mass of each sample when the elements are considered to be in their common oxide forms. The stratospheric samples were collected May 19 on IPC cellulose filters on apparatus in a wing tank of the U-2. The PGAA results indicate that the sample from the greatest altitude resembles ashfall near the volcano, while those at lower altitudes somewhat resemble more distant ashfall.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)