-1&-
Reach
was sampled only
twice, at the first
°
end the last of the
;
\.
)
experimental period
(Pig. 5).
=
These
=.
.
N\
me
.
‘
than for island
:
soil, end & somewhat lower decline
.
NO
mS
eparese deta suggest
@ considerebly low- .
er initial level
im
zn
.
!
°
;
ri
‘.
.
ee ee Le
.
!
ena
rate of -0.7.
vue
Pigure 8 shows
deach sand declines
for eight islands,
and pre-Nectar lev-
As with island soil
there was great
variability, possibly
because of the continual
shifting of
the sand.
The
°
.
pone ‘Seram wavs. eee
northern islands vere
=
els except at Elmer.
“
Pig. 8
only slightly more
radioactive than the
southern islands, but the declines at the southern islands,
especially Henry and Leroy, tended to be steeper than at the
northern islands.
The slower decline at northern than at southern islands
1s probably caused by & greater residue cf radioactivity from
previous detonations (higher pre-Nectar levels) at northern
localities, possibly associated with the water currents.
ead
wee
The decays for beach sand are given in Table 4, page 13.
Except for Henry (Fig. 5), these are based upon only tvo
points.
Beach sand decays were appreciably ateeper at the
southern than at the northern islands. The relationship between the slopes of declines and decays was inconsistent.
At
Henry decline slightly exceeded decay.
At Leroy decays vere
steeper than declines, and at other localities differences
were negligible.
In generel, decays vere steeper than
declines, although not convincingly so.
tt wa nee e-
Tetertieas
peach send at Belle