-13In general,
the levels of radioactivity were low,
averaging less than the potassium-40 levels.
usually
Those radionuclides
which were found in amounts greater than four picocuries per
gram of wet tissue were present in comparatively few specimens.
For example,
iodine-131 was detected in only 21 of 219 speci-
mens and for some of the 21 the error was so great that the
value was of questionable significance.
Also,
the wide range
of values for a single type of sample indicates the great amount
of variation in the samples.
Differences in levels of radioactivity in the different
tissues were slight and variable,
partly because of the low,
often barely detectable,
However,
levels.
in the greatest
number of samples the liver contained detectable amounts of
radioactivity.
On the other hand,
the levels of potassium-40
in liver samples appear to be slightly lower than those of
muscle.
Significant changes in radioactivity in the fish during
the testing period were not observed because of the inconsistency and variability of the data.
There does not appear to be
any marked increase either in the levels of radioactivity or in
the number of fish samples containing detectable amounts of the
specific radionuclides,
with the possible exception of barium-
lanthanum-140 and iodine-131 in liver tissue and iodine-131l
in light muscle tissue.