affected the B-36 samplers. The upper cloud lay far to the vest, while the cloud below 50,000 feet lay within the cirrus to the south-east of These aircraft had to sample below their maximm altitude capability at positions where the presence of the bomb cloud could only pe: be inferred by. the detection of gamma radiation in flying above the qeeve: zero point. cirrus. While sampling in the cirrus, they were unable to distinguish collection results appear to indicate that mch of the radiation in- tensity seen could be attributed to cloud shine, 7 a Although it reported that the bomb cloud was completely obscured by alto-cumulus and alto-stratus clouds at altitudes in the neighborhood of 25,000 feet, the "fractionation sampler" (WB-29, Wilson 1) was the most successful of the sampling aircraft on this "all-weather" mission. Blessed by almost light and variable winis between 20,000 and 30,000 feet, it very systematically searched on instruments for areas of gemma radiation to the north of zero point and was able to collect a normal sacple, | - . The sample collection results for ve BBE«000 are shown in Table 11.2-1. tacparison. The samples collected on the ieeeeeO0t are given for el Inspection of this table immediately reveals that with the exception of Wilson 1, the samples co ~—E DEee 2 ooo ~ possible, theoretically, to conduct a successful "all-weather" sampling | Rission if favorable wind shear conditions exist and are accurately known. -8/- , Se altitudes or whether they were flying through primary cloud. Their eee rman eo whether they were flying in radiation shins from cloud at yet lower