Measurements of the Stratospheric Plume from the Mount St. Helens Eruption: Radioactivity and Chemical Composition

Gas measurements made in the stratospheric plume from the eruption of Mount St. Helens on 18 May 1980 were not consistent with a reported large injection of radon-222 into the atmosphere. No enrichment in the volatile element polonium was found in filter samples, and the ratio of polonium-210 to lea...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 1981-11, Vol.214 (4523), p.904-907
Hauptverfasser:	Leifer, R., Hinchliffe, L., Fisenne, I., Franklin, H., Knutson, E., Olden, M., Sedlacek, W., Mroz, E., Cahill, T.
Format:	Artikel
Sprache:	eng
Schlagworte:	500200 - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989) 500300 - Environment, Atmospheric- Radioactive Materials Monitoring & Transport- (-1989) AERIAL MONITORING Aerosols Aircraft ALPHA DECAY RADIOISOTOPES Altitude BETA DECAY RADIOISOTOPES BETA-MINUS DECAY RADIOISOTOPES CHEMICAL ANALYSIS CHEMICAL COMPOSITION DATA DAYS LIVING RADIOISOTOPES EARTH ATMOSPHERE ENVIRONMENTAL SCIENCES ERUPTION EVEN-EVEN NUCLEI EXPERIMENTAL DATA FLUIDS GASES HEAVY NUCLEI INFORMATION ISOTOPES LEAD 210 LEAD ISOTOPES Measurement MONITORING MOUNTAINS MT ST HELENS MULTI-ELEMENT ANALYSIS Natural disasters NONDESTRUCTIVE ANALYSIS NUCLEI NUMERICAL DATA OXYGEN COMPOUNDS PARTICLES PARTICULATES Pitting PLUMES POLONIUM 210 POLONIUM ISOTOPES RADIOACTIVITY RADIOISOTOPES Radon RADON 222 RADON ISOTOPES SAMPLING Smoke STRATOSPHERE SULFATES Sulfur SULFUR COMPOUNDS Sulfuric acids Volcanic ash Volcanic ash, tuff, etc VOLCANIC GASES Volcanic rocks X-RAY EMISSION ANALYSIS YEARS LIVING RADIOISOTOPES
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Zusammenfassung:	Gas measurements made in the stratospheric plume from the eruption of Mount St. Helens on 18 May 1980 were not consistent with a reported large injection of radon-222 into the atmosphere. No enrichment in the volatile element polonium was found in filter samples, and the ratio of polonium-210 to lead-210 was not different from background values. Data obtained with an experimental impactor, flown shortly after the eruption, showed an increase of 10$^{3}$ in the stratospheric number concentration of submicrometer sulfate particles compared to concentrations before the eruption.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.214.4523.904