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.
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,
Ce!#—Pr' and Ru!*-Rh’! make up muchof the
fixed contamination in thesoils at periods of one
year and moreafter the fallout occurred.
Table 15—Beta Activity in Core Samples of Soil (NRDL)*
Beta Activrry (6-/min/g)
No, or
CorEs
IsLanp
1-IN. INCREMENT OF SOIL COBRING
Ist
2d
8d
1
3
4
1
140
1, 250
6, 600
10, 800
480
2, 100
7, 100
40]
240
570
7, 200
NDA!
130
420
6, 400
1
3
3
42, 000
43, 000
53,000
33, 000
30, 000
48, 000
20, 000
10, 000
26, 000
23, 000
3, 600
20, 000
2
3
2
35, 000
4, 000
16, 000
40, 000
740
7, 500
13, 000
250
3,000
10, 500
170
2, 000
1
57, 000
1
{#) No detectable activity.
*Collections made about February 1, 1955.
37, 000
24, 000
37, 000
NuMBER
oF SAMPLES
Beta
<Actrrviry (6-/
min/g), DrErprrH oF
Som
Otol in.
1
4
5
2
3
6
1
1
1
8,000
Sth
6th
7th
8th
oth
NDA [20.2202 2) .--2 el [enn eee ee
100
160
@
25 |... -----
18, 000
4, 000
Data reported as of March 1, 1955,
Table 16—Summary of Beta Activity in Gross
Samples of Soil (NRDL)*
IsLanp
4, 300
4th
Table 17—Beta Activity in Soil Samples Taken
From Exposed Soil Profiles (NRDL)*
Rongelap} Labaredj|
lto 5 in.
12,400
1, 500
10
140
NDA(a)
70
90 j..-.-------960
550
8, 900
800
48, 000
640
85, 000
1, 300
96, 000
3,100
348, 000
12, 400
8, 400
12, 000
Brera Acrivity (6-/min/g), IstanD
Depra (mN.)
a eneeeeeee
-
90
240
130,000
380
950
T10
160
120
40
Kabelle
72, 000
6, 800
1, 700
130
40
70
100
Kabelic
Kabelle
93, 000
97,000
2, 900
440
400
130
2, 300
240
580
140
70
90
70|
NDA
NDA |-...-.....
© |-..-.-----
-
40 |.-------..
© No detectable activity.
*Oollections made about February 1, 1955.
1, 1955.
Data reported as of March
*Collections made about February 1, 1955. Data reported as of March
1, 1055.
.
DOE ARCHIVES
.
C. Soils
oy
RADIOACTIVE CONTAMINATION OF AREAS IN THE PACIFIC OCEAN FROM NUCLEAR TESTS
Jon wy et Rt
18