ee ge, | ane 7%.kev gemma ray. Thie evidence wes gained from an analysis of the 2 decay rate of reported peak radiation intensities in the cloud. 3, OPERATIONAL PROBLEMS 3.1 Altitude Performance of Sampling Aircraft monet: + The bomb burst formed an upper cloud about 100 miles in diameter with a stem in the center approximately 350 miles in diameter. A white vaporous undercloud was preeent forming ea collar around the RR ae stem. It was initially tangent to the upper cloud at the juncture of the stem with the upper cloud (45,000 ?t) but during the course of the day appeared PT i: It had a diameter about the same as the upper cloud. to subside to about 40,000 ft. Several projecting fingers were present in the neighborhood of the juncture of the stem and upper cloud, and 3 some of the sampling aircraft were directed to sanple in this region. iy 3h Under these circumstances the altitude performance of the aircraft was satisfactory. The maximum altitude attained by any aircraft was 45,000 ft tndicaeted. When such aircraft exist, it would be desirable for very high-yield devices in the future to have about 5,000 ft ‘ additional ceiling capability in order to sample well into the main body of the cloud. Copleasnog LANL, J-Olv, aap