~4O~
The terns, or sea swallows, at the Pacific Proving Ground
also contain gn? in their organs and tissues.
Except during
the time interval shortly after detonation, almost all of the
radioactivity in these animals is due to 2n®>,
In Fig. 14 the
7 curves for tern muscle, lung, liver, kidney, and gut, collected in 1954 at Bikini,
an®? spike.
total
JY
are compared with the curve for a
In each case Zn oS
activity.
contributes almost all of the
In tern liver samples collected in Septem-
ber 1956 at Bikini, however, Co?! , C078, and 09 were also pres-
ent although almost all of the radioactivity was contributed by
zn°? (Fig. 15).
In the corresponding 1954 Bikini tern liver sam-
ple shown in Fig. 15 all of the 7 activity was due to zn©5,
A pattern of distribution of the radioactive isotopes of
the transition elements manganese,
iron,
cobalt and zine in the
plants and animals at the Pacific Proving Ground is evident even
from the limited number of
7
spectrum curves made thus far.
In general, these isotopes are found in the sea and not on
the land, in the marine animals and not in the marine plants.
Table 5 shows the samples, on which
made,
7
spectra have been
in which none of the above named transition elements could
be detected.
Table 6 shows the samples in which the 1sotopes
in question have been observed by
J
spectrometry.
On the land few or none of the non-fission products were
detected in the soil, in the plants growing in the soil, nor in
the herbivorous rats.
In the water surrounding the islands few or none of the
non-fission products were present in the algae nor in the sea