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