-14-
Beach sand
BEACH
Intert idal
“
peach sand at Belle
was sampled only
.
aLice
SAND
JANET
oLive
.
vera
twice, at the first
and the last of the
experimental period
(Fig. 4).
.
.
These
sparse data suggest
& considerably low- .~
z
er initial level
than for island
soil, and a somewhat lower decline
rate of -0.7.
;
Figure 8 shows
beach sand declines
:
_
because of the con-
__,
the sand.
The
northern islands were
only slightly more
_
Leroy
e
.
°
there was great
oa
variability, possibly
of
.
wenny
"|
As with island soil
shifting
eLwer
onuce
for eight islands,
and pre-Nectar levels except at Elmer.
tinual
.
ad
©
cave ‘oFren wav is, 1994
Pig. 8
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
is probably caused by a greater residue of radioactivity from
previous detonations
(higher pre-Nectar levels) at northern
localities, possibly associated with the water currents.
The decays for beach sand are given in Table 4, page 13.
Except for Henry (Pig. 5), these are based upon only two
points.
Beach sand decays were sappreciably steeper at the
southern than at the northern islands.
The relationship be-
tween the slopes of declines and decays was inconsistent.
At
Henry decline slightly exceeded decay. At Leroy decays were
steeper than declines, and at other localities differences
were negligible.
In general, decays were steeper than
declines, although not convincingly so.