indicates that the water or barge shots have ratio values which increase with yield. The very-low values of this ratio for the two coral island shots might be significant. If the reaction (CA%(n,d)a*) contributed any quantity of A*’ to the nuclear cloud, such an effect would tend to lower the C'YA "ratio. In Table 3.22, only those long-range data are shown in which isotopic concentrations are sufficiently high above background to warrant inclusion, No observations or correlations with close-in data are made. 4.6 PETROGRAPHIC ANALYSES All shots resulted in the formation of microspheres; these particles represent the non-crystalline constituents and presumably include compounds from the bomb, fission products, bomb casing, and bomb support. All shots except Shot 6 resulted in collection of one or more of the following crys- talline compounds: (oxide, hydroxide, and carbonate) of calcium, magnesium oxide, and sodium chloride. Shots 1 and 3 show only calcium compounds, indicating that little, if any, sea water was vaporized. Shots 2 and 4 show principally sodium chloride and magnesium oxide from sea water, al- though Shot 4 shows some calcium compounds, indicating that a small per- centage of island material was vaporized in this shot. Sodium and calcium compounds were absent as major constituents of the debris for Shots 5 and 6. It is significant, perhaps, that rain was reported subsequent to both tests, which may have resulted in the leaching of these compounds from these two events. 4-7? SPECIFIC BETA ACTIVITY From a plot of the number of particles per unit logarithmic interval of disintegrations per minute divided by the cube of the particle diameter in microns, a modal value for specific beta activity can be obtained from the apparent normal distribution curve. The modal values for the Castle shots are only rough estimates since the observed frequency distributions covered a broad spectrum of specific activities with no pronounced peaks. Modal values for the barge shots were much greater than those from island shots. 42