18
RADIOACTIVE CONTAMINATION OF AREAS IN THE PACIFIC OCEAN FROM NUCLEAR TEST.
C. Soils
Tables 19 and 20 show the analyses b:
HASL.®
Graph 3 shows the general levels of activity
in the soils of Kabelle and Labaredj Islands of
The data clearly indicate the major portio:
of the activity is to be found in the top thre
inches of the soil. As suggested in chapter II]
Ce—Pr™ and Ru!-Rh’™ make up much of th
fixed contamination in thesoils at periods of on
year and more after the fallout occurred.
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.
Table 15—Beta Activity in Core Samples of Soil (NRDL)*
Brera Activiry (-/min/g)
No. or
CorEs
IsLanD
1-IN. INCREMENT OF BOIL CORING
1st
1
140
3
4
1
1
1
3
3
1
2
1, 250
6, 600
10, 800
57, 000
42, 000
43, 000
53, 000
37, 000
35, 000
3
2
(s) No detectable activity.
*Collections made about February 1, 1955.
4,000
16, 000
a
40
430
2, 100
7, 100
24, 000
33, 000
30, 000
48, 000
87, 000
40, 000
740
7, 600
4th
bth
4
NDA!
NDA
250
3, 000
170
2, 000
240
570
7, 200
4, 300
29, 000
10, 000
26, 000
8, 000
13, 000
130
42
6, 400
18, 000
23, 000
3, 600
20, 000
4,000
10, 500
6th
7th
8th
Oth
{.-........|.---..---.|----------]---e eee ee
100
160
ao
26 j.....--..
230
160
200
180
E
6,800 [oe eee eee
26, 000
12, 000
11,000 |..-.---.2-J-.-.2.-.10,000 |...------.).--2. 22 fee e eee [eee eee
2, 000
2, 300
180 |...----...|-.--.-.-14, 000
1,000 |......----f----- 22 e eee ee
4, 400
3, 400 |.--2..2.--]---------- [eee e eee
10, 000
10, 000
4,700 |...-------]----.----
120
1, 800
100
1,100
27 |.--- ee ee [eee ween
160
100 |.-.---.-.
Data reported as of March 1, 1955.
Table 16—Summary of Beta Activity in Gross
Samples of Soil (NRDL)*
IsLanp
3d
NUMBER
OF SAMPLES
Beta
Acriviry (6/
OF
minjg),
Som
DEPTH
Table 17—Beta Activity in Soil Samples Take:
From Exposed Soil Profiles (NRDL)“
Drrre (N.)
Beta Actrvirr (6-/min/g), Istanp
Rongelap; Labaredj|
Kabelle
Kabelle
Kabell
ee AW eh
Otol in.
Fg Tite ee
waitesee Saad or
*Oollections made about February 1, 1955.
1, 1956.
90
960
8, 900
48, 000
85, 000
96, 000
348, 000
8, 400
12, 000
Data reported as of March
® No detectable activity.
*Collections made about February 1, 1055.
1, 1955.
Data reported as of Marc