————— en — UNCLASSIFIED 7. IS THERE EVIDENCEOF "DRD’* OF DEBRIS STORED IN THE Ww BY SUPER BOMBS? TMOSPHERS , Method of Stixiy Analyais of samples fron worldwide fallout network. This probles has been sade by detonations in tities country Loult end the is aw in the atmosphere te fallout in Movember-Deceskar approximately 0.1% of the c residual activity from this The mean weekly falleut at is continuing to diminish with theme we ee, of perhaps one to two monthe, onation. stations a halflife MISCELLANETUS HIGHLICHTS i. Fallout recorded by the worldwide network, cperated on a skeleton basis between tests, was less than 1 d/m/fs¢/day in December. The origin of the debris is in doukt but ths 89/90 ratio suggmsts Peau MIKE. Thia rate of fallout is equivalent to .02% per week . wotal residual radioactivity from MIKE. 2. Taking all our data into consideration, we find we ars u: wren preface as fic et Siew te wt. coereo| a account for more than 5% of the MIKE fission product yield M Day to the present. A preliminary estimate, based on our samples to date,indicate that present atmospheric storage, cipitated, will contribute about as much Sr’¥ to the earth is already present. 00131986 008 3 7~ “1g a > 1051031