Fish.
In fish a fairly even distribution of active mater-
ial is seen in muscle,
liver,
Most of the activity was
gut,
and to some extent in bone.
in the gut and liver as indicated by
counts as well as by autoradiogrephs.
The activity is less evenly
distributed on or in the skin, in that more“specks" were in evidence in this tissue.
In some fish a concentration of activ-
ity was noted in the gills (Fig. 23) or in the teeth (surgeon
fish, Pig. 2h).
Carnivores end omnivores showed striking dif-
ferences in the amount within the body cavity (Fig. 24).
Land plants.
Washing with running tap water removed 10
to 20 percent of the activity on the land plants
in most cases,
although a much higher percentage of the “speck” contamination
was removed by this method from the leaves of a grass collected
at Engebi (Fig. 25).
The remainder of the radioactivity was
partly spotty and partly homogeneous in distribution.
The spotty
activity was probably due to material that was not washed from
the external surfaces of the plants, and the homogeneous activity was the result of dissolved radioactive material that had
been actively absorbed and metabolized by the plant.
radioactivity wes highest in the veins,
In leaves
the conductors of eb-
sorbed msterials throughout the leaves.
4.9.2
Other Surface Contamination
The general problem of surface contamination from indirect
sources
is
illustrated by specific examples such as the contam-
ination found
on the carapace of a crab,
- 96 -
on the shell of a cian,
ig
ATV
soit * re