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Main Title Airborne radiological sampling of Mount St. Helens plumes /
Author Andrews, Vernon E.
CORP Author Office of Radiation Programs-Las Vegas Facility, NV.
Publisher U.S. Environmental Protection Agency, Office of Radiation Programs, Las Vegas Facility,
Year Published 1981
Report Number ORP-LVF-81-2
Stock Number PB81-213795
OCLC Number 12743940
Subjects Radioactive pollution of the atmosphere ; Air--Pollution--Washington (State)--Saint Helens, Mount, Region
Additional Subjects Radioactive contaminants ; Air pollution ; Mount Saint Helens ; Plumes ; Particle size distribution ; Aerial surveys ; Sampling ; Uranium ; Thorium ; Radium ; Lead(Metal) ; Polonium ; Radon ; Concentration(Composition) ; Volcanic ejecta ;
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA ORP-LVF-81-2 Headquarters Library/Washington,DC 08/20/2014
ELBD ARCHIVE EPA ORP-LVF-81-2 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
NTIS  PB81-213795 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation iii, 14 pages ; 28 cm
Particulate and gaseous samples for radiologial analyses were collected from the plumes created by eruptions of Mount St. Helens. The sampling aircraft and equipment used are routinely employed in aerial radiological surveillance at the Nevada Test Site by the Environmental Protection Agency's Environmental Monitoring Systems Laboratory in Las Vegas, Nevada. An initial sample set was collected on April 4, 1980, during the period of recurring minor eruptions. Samples were collected again on May 19 and 20 following the major eruption of May 18. The Environmental Protection Agency's Office of Radiation Programs analyzed the samples for uranium and thorium isotopes, radium-226, lead-210, polonium-210, and radon-222. Other laboratories analyzed samples to determine particle size distribution and elemental composition. The only samples containing radioactivity above normal ambient levels were collected on May 20. Polonium-210 concentrations in the plume, determined from a sample collected between 5 and 30 km from the crater, were approximately an order of magnitude above background. Radon-222 concentrations in samples collected from the plume centerline at a distance of 15 km averaged approximately four times the average surface concentrations. The small increases in radioactivity would cause no observable adverse health effects.
"ORP-LVF-81-2." "April 1981." Cover title. Includes bibliographical references (page 14).