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The unhatched embryos contained levels of radioactivity approxi-
mately one-half that found in bird muscle (Appendix Table VIII).
Plankton
The Rongelap plankton collection consisted of a single tow
on March 26, paired tows on July 16, December 8 and December 18,
1954, and four paired tows January 26-30, 1955.
A Michael Sars
type net, 3-meter in diameter and with either No. 6 or No. 20
SOUSRNGE aR re ese
silk mesh was used.
Tows were taken at the surface during day-
light hours.
Radioactivity of the Rongelap plankton samples was more
than one hundred times greater than that of plankton samples
collected from the open ocean waters of the Western Pacific
with the USCGC "Taney" during Operation Troll.
On the cruise
of the “Taney” during March and April, 1955, 85 plankton
samples were taken along the route from Kwajzlein to the
Philippines to Japan.
The average activity of these samples
was .015 x 1073 uc/g of wet sample, the highest values being
050 x 1073 uc/g.
For the eight January 1955 Rongelap plankton
samples the-average value was 2.0 x i073 uc/g,
the lowest value
being 0.42 x 1075 uc/g.
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psisinileenenins nn Jatin bn
Other conclusions which may be drawn from analysis of the
Rongelap plankton samples are (1) that the radioactivity per
unit weight is greater than for most other biological samples,
(2) the decay rate is similar to that for the soi] sample, end
(3) there is considerable variation in the radioactivity of samples from paired tows.
UM
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