ARTIFICIAL RADIOACTIVITY REFERENCE HORIZONS IN GREENLAND FIRN.

• Main Authors: Crozaz,G., Langway,C. C., Picciotto,E.
• Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
• Format: Text
• Language: English
• Published: 1966
• Subjects: Snow; Ice and Permafrost; Radioactiv; Radioactive Wastes & Fission Prod; (*GREENLAND; *ARTIFICIAL RADIOACTIVITY); (*SNOW; GREENLAND); STRATIGRAPHY; NATURAL RADIOACTIVITY; BETA PARTICLES; STRONTIUM; FALLOUT; Greenland; Ice; Ice Sheet; permafrost
• Online Access: http://www.dtic.mil/docs/citations/AD0644597; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0644597

Total beta measurements have been made on melt water samples from a stratigraphically dated firn core profile from the inland Greenland ice sheet (77 deg 10 min N, 61 deg 08 min W). A marked increase in radioactivity is found in the 1953 firn layer which corresponds to the first important fallout from nuclear test bombs. The pre-1953 natural beta activity is 5 dpm/kg. The influx of artificial debris from the Ivy tests in 1953 is noted by a sharp rise in beta activity to 10 dpm/kg. Total 90Sr deposit to June 1964 is 9.3 plus or minus 1.5 millicuries/km2 (24 plus or minus 4 mC/mi2). Average 210Pb activity at time of deposit is 3.9 plus or minus 0.4 dpm/kg. (Author)