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 ITI,
Ce!#—-Pr™ and Ru'*-Rh' make up muchof the
fixed contaminationin thesoils at periods of one
year and more after 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 Febtuary 1955 survey,’ and Table 18 for the February 1956 survey * by NRDL.
Table 15—Beta Activity in Core Samples of Soil (NRDL)*
Beta Activiry (4-/min/g)
No. oF
CoREs
IsLaND
1-IN. INCREMENT OF SOIL CORING
Ist
Likiep--.....------.-.-------..2-----------
1
2d
140
3d
40
40|
Utirik......-----------en econo eee eee nee
3
1, 250
480
240
Rongelap.__..-.----.-.------------+--+ eee
4
6, 600
2, 100
570
Busch__--_...-----22-----2- ee eee eee
Enlaetok.._--2-----1-2----neeeeeeee eee nee
Labaredj....----.-------------------------Kabelle_._..-.-----.----------------------Lomuilal....-.----.---------+---------- eee
Gojen.__-..-------------------- +--+
6, 400
18,000]
23,000]
3, 600
20, 000
4, 000
3
4, 000
740
250
170
35,000]
16,000
40,000}
7, 800
Beta
Activiry (6-/
min/g), DEPTH oF
Som
Oto in.
1
4
6
2
3
96, 000
3, 100
Gojen--..- nn ennen--ee eee eee nee
Bikar-...-.---------2 22-2 e een ee
1
1
348, 000
8, 400
12, 400
90
Eniwetak....-.---------------..-
i
12, 600
240
*Collettions made about February 1, 1955.
1, 1055.
3, 000
10,500]
2, 000
100
ith
8th
$th
|.-.-_2---_|_-.---.----|--.-.-----[----------
160
60
230
160
200
10,000}
10,000
1, 800
1, 100
26 |.-..-.----
150
50
6, 800 |..-_------[-------..-|---- fee eee
26,000|
12,000;
11,000 [--._....--[-.-.----.19,000 |_.-....-.-|------.---}----.-----|e-- lee
2, 000
2, 300
180 J._.....--_|----14, 000
1,000 |....------J.-.-------]---------4, 400
3,400 |--....----]---.------]------120
4,700 |---..-----]----------
100
27 |----..----]----------
160
100 |...-....--
Table 17—Beta Activity in Soil Samples Taken.
From Exposed Soil Profiles (NRDL)*
BEta ACTIVITY (6-/min/g), IsLaND
DEPTH (IN.)
Rongelap| Labaredj|
Kabelle
Kabelle
72, 000
6, 800
1, 700
130
93, 000
2, 900
400
2, 300
Kabelle
1lto 5 in.
Likfep.......---..----.--.-----..Utirik.._.....-----~..---------.-Rongelap.....-.------..-.-----..Enisetok....---.----.---..---..-.
Labaredj...-..-----...-------2a08
90 j--i.w eee
960
550
8, 900
800
48, 000
640
85, 000
1, 300
6
13,000]
6th
Data reported as of March 1, 1055.
Table 16—Summary of Beta Activity in Gross
Samples of Soil (NRDL)*
FKabelle
420
7, 200
4,300
29,000}
10,000
26, 000
8, 000
2{
NUMBER
OF SAMPLES
NDA
130
7, 100
24,000
33,000]
30,000]
48, 000
37, 000
Eniwetak.-...------------------------- ++.
IsLaNnD
NDA),
10, 800
57,000}
42,000}
43,000}
53, 000
37, 0CO
2|
(8) No detectable activity.
*Collections made about February 1, 1955.
6th
1
1]
1|
3]
3
1
Lukuen.....-------------- 2-22 e eee eee
Bikar. ..._..---.------------+---------- ee
4th
Data reported as of March
Uh
3 2...--------a
6_.-..-2----2----9. +...
12,400
1, 500
110
140
12_.-.------- 2... NDA(*)
130,000
380
950
770
160
40
18__..-----.-.-...70
120
70
24.20. n |e eee
40
100
30.2 eee |---| eee eee [eee eee
36__..--.-.--.---.-[----...---[----..----|---.- =e
40. een beeen eee [enn ee en fee nee
* No detectable activity.
*Collections made about February 1, 1955.
1, 1955.
580
97, 000
440
130
240
140
70
90
70
NDA
NDA
|---...---60 |----.-....
40 |.--...----
Data reported as of March