D.
3.4.2 Depth of Mixing.
The analyses of samples from various depths are included in Appendix
The summary of these results (Table 3.7) show beta activity of the surface samples, and the
integrated area under the curve for depth versus beta activity of sample. This area is representa.
tive of the total activity contained under a square centimeter of ocean surface.
The surface and total activity are plotted in Figure 3,26. This figure indicates an effective
depth of mixing of 60 meters for fallout deposited in the sea around Bikin{ Atoll. A more thorough discussion of the mixing function may be found in Reference 9.
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