1.2
Precipitation Collections for Radiostrontium and Radiobariu
In precipitation collections, two collectors are simultaneously
exposed during dry and rainy weather.
The collection period terminates
immediately after a precipitation or after a week of no rainfall.
1.21
Pittsburgh, Pennsylvania
Since February 1955, precipitation collections have been made
by Nuclear Science and Engineering Corporation in galvanized tubs
(exposed surface 2.58 rte per tub).
Table , up-dates the Pittsburgh precipitation data in HASL-~l2,
"Environmental Contamination from Weapon Tests".
illustrates the cumulative Sr90 fallout.
Figure 2 graphically
The error terms represent the
standard error of counting.
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Until February 1957, the contents of the two tubs were
combined resulting in one analysis for the collection period.
Since
February 1957, the contents of each tub have been analyzed separately.
Precipitation values were obtained from the United States
Weather Bureau until Jume 19, 1957.
Since then, precipitation has been
measured by Nuclear Science and Engineering personnel using a Fisher
# 1-22-5 United States Weather Bureau type rain gauge.
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