-27-
comparison
origin (Redwing) of part of the activity, but with a distinct upward
ance is taken
flexure indicating the effect of the original fallout from March 1, 1954.
ved to have
Samples 6076-77 of plankton collected July 1956 from the Rongelap
Isiand vicinity of Rongelap lagoon were more radioactive when first
did suc-
cay of
counted one month after collecting than the corresponding sample
curves 4-6
(6079) from the lagoon near Kabelle Island.
3.
Island samples (6077) was about 2-1/2 to 9 times more radioactive than
The two
The first
One of the Rongelap
the other two samples and decayed most rapidly of those studied.
Thus,
1.4 which
it was evident that there was a more rapid decay of the radioactivity in
res over al-
plankton from the part of the lagoon near Rongelap Island than occurred
near Kabelle Island.
Eniwetok
This is interpreted as indicating the influence of
mn from
recent Redwing detonations whose fallout affected the southern more
a down-
than the northern part of Rongelap Atoll
y almosta
Decay of March 1958 samples was negligible during the two months
, 740, as
from September to November 1958, while August 1958 samples decayed
this pat-
during the month of November 1958 fairly rapidly, with a half life of
etry of the
about 100 days, thus supporting the assumption that the increased levels
wed Cel44
were attributable to the Hardtack series of detonations.
Iresumably
The rate of decay of the samples collected in 1954 was less steep
iotopes,
than the rate of decline of radioactivity in Rongelap lagoon plankton.
-cond group
Figure 9 the decay slopes of curves 1 to 3 range from v1. 6 toa maximum
f the recent
of -2.4, even in the Steep portion from 660 to 1, 740 days, while in
Figure8
rer me ey eo
.
the decline slope shown by the dotted line is -3.5.
In
Compensating