“
aot
cptee Wy ea ba
ae she emmaade dblee ER dreAaaihe En ed Sd
-14-
Beach sand
Intertidal
beach sand at Belle
was sampled only
twice, at the first
and the last of the
experimental period
(Fig. 4).
These
er initial level
than for island
soil, and a some-
ALICE
SAND
JANET
.
OLIVE
VERA
"
|
sparse data suggest
& considerably low-
BEACH
r00
3
:
what lower decline
rate of -0.7.
if
;
™
sruce
.
ciwen
.
nENry
Lenoy
Figure 8 shows
for eight islands,
and pre-Nectar lev-
:
els except at Elmer.
As with island soil
there was great
variability, possibly
because of the con-_,,
tinual
shifting
the sand.
The
of
.
.
|
0
ok.
*
beach sand declines
,
"0
o
_
,
opars ‘AprEeR may \", ise?
northern islands were
only slightly more
:
0
_
00
Fig. 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 4 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 (Fig. 5), these are based upon only two
mda
3
points. Beach sand decays were appreciably steeper 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 were
steeper than declines, and at other localities differences
were negligible.
In general, decays were steeper than
declines, although not convincingly so.
4 yy be,
» AT”
cy
wT
*
mee