Figure 20 and Table 14
@ive the decay data.
Kidney
decay, like kidney decline,
was comparatively gradual,
indicating the uptake of
longer-lived radioisotopes by
this, than by other clam
tissues. The comparison of
decay and decline in the last
two columns of Table 14 shows
that decay and decline vere
approximately equal.
Table 14.
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The equality of decline and decay rates is further substantiated by a method used by Held (1957) on samples of hermit
crab carapace.
If samples collected soon after detonation decay
to the same levels observed for samples collected at later dates,
then the rate of decl‘ne would be equal to the rate of decay; in
fact, decline could be accounted for solely on the basis of
physical decay.
Such an equality was demonstreted by recounting
clam kidney samples in October 1957, 2 to 3 years after they were
collected.
When the 39 available plates of clam kidney collected
6 to 536 days after Nectar were thus recounted in October 1957
the levels of radioactivity were randomly scattered from 2,000
to 10,000 without any trend that could be related to date of
collection.
That is, the early samples were neither higher nor
lower than the later samples, ina statistical sense.
The
correlation coefficient of log activity related to log days after
May 14, 1954 was .05, which, for 37 degrees of freedom falls
short of even the 10% level of P.
Results were similar to recounts of samples of snails and sea cucumbers which are graphed
in Pigures 24 and 30 respectively.
Clam kidney resembled snail
tissues in that eariy and later samples were alike when recounted
in 1957, while for most sea cucumber tissues the aarly sascles
tended to be more radioactive than later samples when all were
recounted in 1957.