18
RADIOACTIVE CONTAMINATION OF AREAS IN THE PACIFIC OCEAN FROM NUCLEAR TESTS
C. Soils
Tables 19 and 20 show the analyses by
HASL.®
The data clearly indicate the major portion
of the activity is to be found in the top three
inches of the soil. As suggested in chapter III,
Ce4—Pr'* and Ru!™-Rh'* make up much of the
fixed contamination in thesoils at periods of one
year and moreafter the fallout occurred.
Graph 3 shows the general levels of activity
in the soils of Kabelle and Labaredj Islands of
Rongelap Atolls, as reported by AFL?
Tables 15, 16 and 17 report the activity in
different soils at different depths for the February 1955 survey,’ and Table 18 for the February 1956 survey * by NRDL.
wo
Table 15-——Beta Activity in Core Samples of Soil (NRDL)*
Beta Activity (@-/min/g)
No. oF
CorgEs
IsLanp
1-IN. INCREMENT OF SOIL CORING
lst
1
140
3
'
2a
40
1, 250
4
3d
480
6, 600
2, 100
40
230
570
4th
6th
NDA!
NDA
130
420
6th
10, 800
57, 000
42, 000
43, 000
53, 000
37, 006
35, 000
7, 100
24, 000
33, 000
30, 000
48, 000
87, 000
40, 000
7,200
4, 300
29, 000
10, 000
26, 000
8, 000
13, 000
6, 400
18, 000
23, 000
3, 600
20, 000
4, 000
10, 500
6, 800
26, 000
19, 000
2, 000
14, 000
4, 400
10, 000
Eniwetak..-_.----.-----------.-.0---- eee
2|
16,000
7, 500
3, 000
2,000
1,800
(s) No detectable activity.
“Collections made about February 1, 1055.
740
Beta
Activiry
min/g),
or!SAMPLES
ithe. ee aS
neat
5
FicusOo hae
2
3
6
1
1
1
"Collections made about February 1, 1955.
1, 1955.
12
DEPTH
(6
OF
Table 17—Beta Activity in Soil Samples Taken
From Exposed Soil Profiles (NRDL)*
Berta Activity (6-/min/g), IsLanp
DEPTH (N.)
Rongelap| Labered)| Kabelle
Son
Otol in.
]
170
Data reported as of March 1, 1955.
Table 16——Summary of Beta Activity in Gross
Samples of Soil (NRDL)*
'
250
oth
100
1
i
1
3
3
1
2
4, 000
&th
230
Enisetok...-..-0-222-.. 222-522 e eee ee eee
Labared]...--.- 22-22. - 2 2 -e eee ee eee
Kabelle....-.-..--2.---2--- +e. eee eee
Lomuilal..-.....-2.---+- +--+ 2 ese neon nee
Gefen. -...-.. 22-22 -- eee eee eee
Lukuen..-.-_.-...2---22 22-42-2202 2-2 eo eee
3
7th
1 to § tn.
8, 900
48, 000
85, 000
96, 000
348, 000
8, 400
12, 000
130,000
72, 000
93, 000
110
950
1, 700
400
140
800
NDA(*)
640
130000
$1000
380
770
160
6, 800
130
40
70
120
70
fence
40
100
fee eee] ee lee ee ee
12,400
MO
240
Data reported as of March
32,400
1, 500
on wereeceeeeo
ff
wee be
= No detectable activity.
*Collections made about February 1, 1955.
1, 1955.
Kabelle
2, 900
2, 300
° 680
Kabelle
97, 000
“a
1X
2K
1K
70
a
70|
NDA
NDA [-..-..00..
60 j-.----2 Le.
40 |e...
Data reported as of Marck