0018933 - in water sam les little fractionstion We ‘foundfer the one ¢ - (Reference 34), device detonated in detp water oc At Operation GREENHOUSE it was noted that the exponent of the beta decay curve increased from 0.95 to 1,3 with median particle size for samples teken frem the clouds at Dog, Ezzy and Able shots, This in- dicates that the cloze-in particles are enriched in fast decaying components with respect to the more distant fallout (Reference 53). For JANGLE surface shots, prcenounced cepleticn of chains 89, 115, 111 and 140 referred to Mo?? was observed in compering leng-range with local fallout samples, Chains 144 and 95 were not fractionated, Still more ex- tensive ruclide separation was found for the urdergroznd shot with al the above chzins shewing depletion in the crater arez (Reference 53). Ona Shot 6 at TUMBLER-SNAPPER the groas decay exportnt decreased steadily with distance from ground zero up te seventy miles (Reference 53}, Radiochemical dats from CASTLE Brave showed fractionation of sr’? and Ba? #0 with respect to Mo?’, but none for ce! *4 (Reference 53). In the land Shots Zuni and Tewa of Optration REDWING, depletion of c3137, Sr70 and pe l32 was found in the close-in fallout with miximum factors of 100, 13 and 7 (Reference 54). These depletion factors became smaller with increasing distence from the shot paint, 31 Fractionation of the