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ly in the stratornphere and the particle size, sithevgh not known, roust
be very small, probably less then 0.1 micron,
It ig dietributed by the
etratospheric winds in the east-west or west-east direction, and thsre
is also thought to be a slow circulation toward the poles,
Movement into
the troposphere can take place by slow settling or by ses.conal changes
in the altitude of the tropopzuse,
The exckirge may be most prevalent
at the break in the trcopcpause near the middle latitudes,
Once transfer
from the stratosphere is completed, the material will be deposited relatively quickly in the eame manner as intermediate fsllout (Reference 23).
1.2.4
Procedures for the Determinztion of Fallout Partitien.
The
hazards cf nuclear wezpons testing are agsociated primarily with worldwide fallout, since local fallout can be controlled by selection of the test
site and the proper winds aloft so that its arez of depesition will be of
However, local fallout has local
miner consequence to the population of the world, Introduction of radio;
ecological consequences which are not neglibitie Aud 14
aad fuse Spat Lite
2
.
.
.
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.
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.
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muclides, such es sr79, into the human ervironment viz world-wide fallout
his 2 potential effect on the whole population and their significance hes
been studied in grezt detzil (Reference 24},
As a result ef theze studies,
it has been concluded that certzin radionuclids levels at the sarth's sur.
.
.
.
.
.
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eptsole limits by restricticas om the rate of nuclear testing.
yy
qn
a
face can be tolerated anc thet these levels can Fe mintzined within
This is
Ezsed on the concept thit a ecrdition of "equilibrium" is rezched in the
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