FISSION PRODUCTS OVER THE PACIFIC NORTHWEST
MW
ee
cml
—
435
eTTTT TTT TTT?) TT
ene
© STRATOSPHERIC SAMPLES
=
O TROPOSPERIC SAMPLES
Fig. 7—Ratios of “Mn/'"Cs activities in stratospheric and tropospheric air samples.
was produced in relatively large quantities in the 1961 and 1962 tests.
The maximum is probably due to the late arrival of this radionuclide
from higher altitudes.