407836
YY
HASL SURFACE ATR SAMPLING PROGRAM
Gamma Activity Measurements
for March 1970
Attached are the results of the gamma activity analyses of
filters from the HASL Surface Air Sampling Program for the
month of March 1970.
The weekly samples are composited on a monthly basis and
counted on an 8" x 4" sodium iodide (Tl)
crystal.
The
integrated response between 100 Kev and 3.0 Mev is corrected
by the average detection efficiency (35%) of the gamma photons present in fallout.
The results are reported in units
of photons per minute per 1000 standard cubic meters
(sea
level conditions of the ICAO Atmosphere).
1
-
Gamma concentrations
in
surface air
for 1970
Figure 1
-
Gamma Activity as a function of latitude,
March 1970
Figure 2
-
Average monthly hemispheric gamma concentrations
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