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sno uneertainty as to the source of current fallout
requires more extensive calibration than in the past.
The
simplicity of gummed film for daily network operation makes
it necessary that it be retained for routine sampling.
The
possible errors in attributing activity to a given source
is expscted to be overcome by a broader network of pot
sampling stationse
The operating and projected stations in
the HASL prcgram are shown in Fig. 4.
These samples will be
collected monthly and analyzed for MFP and Sr-90 and probably
for Cs=147e
Cooperative tests will start in April 1957 on a fallout
collector designed by Dre Bo Aler of Sweden.
Feilout collects
in a plastic funnel and is passed through a filter and ion
exchange column to collect the activity.
Such a collector
would be simple to maintain and to ship to a central laboratory for processinge
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