ABSTRACT : tives of this pr ‘ 4 the chemical and radiochemical composition of solid fallout as a function of particle size, zero-point environment,time and distance of collection, and gross decay characteristics;"Sad te-imvestTgats the chemical ang, - 2 radiochemical nature of liquid fallout and base sunteee ates fh sample of solid fallout from Shot 1 was seperated into 14 part icle-size fractions which were analyzed for,1SESP— 2 p25 —MoFA, ; andCoy, | In, each case the activity per unit weisht of act've particles below 50,was “found to decrease regularly with increasing size, but in a different manner for each nuclide, indicating radiochemical fractionation . Above 50; ‘the relationships were obscur The gross decay did not vary at all with chparticleattines, and only slightly at later “times, WIn the fallout from Shots 1 and 3,$r89~end-satho showed a greater tendency to concentrate in the liquid phase than the other fission products studied. Shot 4 fallout samples, principally liquid, obtatned—from-= Project-2,5b-intermittent-falloutcolleotor indicated that the relative concentrations of, 5 mt & increase’ with time of collection. The_base_surge-sampling- program—was—unsuccede fiikw No information was ocotained on variations of composition with distance, < ye Sb, we Sr F7 4 -95, Mo? B3-140, Z ard mw" snd kas we ¢ C2-7 40 5-6 SECRET —- RESTRICTED DATA (HK