Artificial radioactivity reference horizons in Greenland firn

Total beta measurements have been made on melt water samples from a stratigraphically dated firn core profile from the inland Greenland ice sheet (77°10′N, 61°08′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 d.p.m./kg. The influx of artificial debris from the Ivy tests in 1953 is noted by a sharp rise in beta activity to 10 d.p.m./kg. Total 90Sr deposit to June 1964 is 9.3 ± 1.5 millicuries/km 2 (24 ± 4 mC/mi 2). Average 210Pb activity at time of deposit is 3.9 ± 0.4 d.p.m./kg. © 1966.
SCOPUS: ar.j
info:eu-repo/semantics/published