0018933

CHAPTER IV
CONCLUSIONS AND RECOMMENDATIONS

4.1

CONCLUSIONS
1.

The results suggest that for megaton range weapons detonated

at or near the ocean surface around one-half of the Sr?° and two-thirds of
the Cs!37 formed will be dispersed over distances greater than 4,000
miles.
2.

Corresponding figures for a calcareous land surface are arourtd

one-fifth for Sr?) and one-half for cs! 37,

More uncertainty is associated

with these values due to the poorer quality of the data.
3.

Radionuclide fractionation is pronounced in shots over a calcareous

land surface,

The local fallout is depleted in both sr?9 and cs! 37 » while

the upper portions of the clouds are enriched.

Fractionation is much less

for water surface shots.
4.

Nuclear clouds are non-uniform in composition and certain nuclide

ratios vary by rather large amounts from top to bottom.

Again, this is

much larger for land than water surface detonations.
5.

Sr’

90

and cs37 distributions computed from cloud and fallout data

are roughly complementary to one another.

SAN BRUNO ERE

92

9g

Select target paragraph3