ALES 65
EFFECT OF HARD TACK SERIES
Comparison of levels of srosg beta activity of
invertebrates at Rongelap Atoll
in March 1958 with those
in August showed a slight rise to have occurred in the
interim,due to the Hard Tack series of tests.
This con-
clusion is based on a comparison of 39 tissues
of various
invertebrates (Table 5) at tne two collecting periods.
On the basis of wet tissue, 14 were higher in March than
in August, and 25 were higher in August than in March,
and,
on the ash basis, results were almost the same, 13
and 26.
Using chi-square this is significant at about
the 5% level.
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