iad
ecnna£e weds Fac
FO Te ee en gp yt in.
3
.
.
*
The Sate tons ai £25
nt mt Fm eam, ake
feee
Smt ee te,
ote,
an
from Rongelap (2.43 x 10° units).
In general, snails had a high number of sunshine units (276 to $02),
A relatively high level of Rui (19.2 per cent of beta activity) was alse
found in a snail from Gejen,
..
.
The coconuts, which had high levels of Cs??’, were undoubtedly the
source of the Cs!¥7 activity found in the coconut crab,
i gee
newb
ge
= ee ee
Oa
+ age
A high level of Cs!3" (with a 37-yr half-life) was found in a coconut
crab, A similar finding was noted at one yeareedeecae In the
analyses from previous island resurveys,
was the major radionuclide found in land food plants and also inthe tissues of land aniznala,
The presence of Co in two samples of clams was more for the first
time in the two-year period since the detonation, The Co™ accounted
for the major fraction of the total activity in these samples. The Co”
was detected by gamma spectral ails and confirmed by chemical
separation and absorption measurements.’ The ability of clams to
concentrate Co™ selectively was verified in laboratory experiments
using clams obtained locally.®
ae
tte
eet
+.
ony tee
teob Se
bee
ae
‘ entrated and retained the larcest amounte
of Sr*’, as would Sc expcried from the simileriny of atroniium icaicuylism to caicium metabolism, The skeleton of a fish from Rongelap nad
587 sunshine units, the highest cbserved in any fish. The highest number of sunshine units in any of the samples analyzed appeared in a clam
Comparison of the fish and marine specimens collected immediately
after detonation and one year later with those studied in the present
report (two years after detonation) indicate a drep inactivity. The fish
from the Rongelap lagoon had approximately one fourth the activity of
those Pas one year post-detonation. Based on radioactive decay
of Zn®5, the change in level is about what would be expected.
” Pep Aorty
. The total activity found in the terns, whose diet is primarily fish,
oe erate RT ie ey HY eR rmemeeerene eae,
weight of the activity in fish from the same locality (Table 4.4),
The
activity of the terns collected from the northern islands of the Rongelap
Atoll was higher than that of terns collected on the southern island, The
terns collected on Rongerik, however, hada higher average concentracdon
of activity than those from Rongelap, in spite of the lower levels of ridio-
active contamination of Rongerik and the fish in its lagoon.
The tibia of the terns, except for that of one tern frorn Kabelle, coa-
tained no detectable activity at this time,
Although the activity in the
tibia of the Kabelle tern had a high value when measured per kilogram
® Unpublished observations, J.K. Gong, W. Shipman, S.H. Cohn, and H.V. Welss,
-27-
en
LN ee cen
;
~~" Re
.
‘
.
was low. The level of activity in the terns collected from the various
atolls varied considerably, but was generally less than half per unit
—pe ele OEEOr
ee yeHYom ke 4 nee cay
Wrsiacubeadius: 4SAHLeahtneeteteaes Lay
Tera roses
ESTES PO
oN
OE
eTLT
a
vio
NET
ee me Reprerem
Ls
.
See
pees
.
.
So Re