194 DASA 2019-2 ? 2 Te ’ 4 5 6 7 8 1.3 ’ c o E f 9 1c ™ 9° 14° Ni o 2.3 © 0 oN\o 8 SA ° Ar 2.3 680 10 lo oo | ] o 'o 9.6 ad jo x NQninyy ° g 2 o 30 TN 150 mcm Os wow woe 500 °o nm 9 . 20 worl 22 19 . 166° € Figure 39, Radioactivity of plankton in thousands of disintegrations per minute per gram following atomic tests at Bikini and Eniwetok Atolls. From i. Donaldson. DONALDSON: When I refer to shallow water I m.ean the water in . the mixing layer, which, in this area, is about 600 feet. The deep water lies below this mixing layer. DUNHAM: You don't mean shore water? DONALDSON: WYCKOFF: No, I mean open ocean water, What are the units for the numbers? DONALDSON: Theyare contour lines of radioactivity in the plank- ton in thousands of disintegrations per minute per gram. These are the plankton that move up and down. They were collected through the entire mixing layer. This chart shows the distribution in the sea in the vicinity of the Bikini and Eniwetok test sites. UPTON: How long aftcr detonation were these measurements made? DONALDSON: The plankton samples were colivcted June 11 to 21, 1956, during the testing period.