t
at
.
rns
“
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Operation Castle.
They should not, however, be used to draw any
detailed conclusions as to changes in the tritium concentration in
the intervening period.
5.2
Recent Results for the Stratosphere
Tritium concentrations from 50,000 to 90,000 feet in 1957-1958 as
measured by the method herein outlined are given in Table 5.2.1.
5.353
Recent Results at Lower Levels
Best values for the tritium concentration of the troposphere and
lower stratosphere are from samples collected in January 1958 between
JOON and 74ON.
These results are summarized in Table 5.3.1.
Rather large fluctuations in the tritium content up to 20,000 feet
are to be expected because of the effect of precipitation.
which was 10,000 to 13,000 feet above the tropospause,
At 40,000 feet,
the tritium content
was very similar to that found over Minneapolis, Minnesota, at 50,000
feet, also at about the same height above the tropopause.
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