18
GROSS ACTIVITY
RADIOACTIVE CONTAMINATION OF AREAS IN THE PACIFIC OCEAN FROM NUCLEAR TESTS
C. Soils
Graph 3 shows the generallevels 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.®
Gejen
The data clearly indicate the major portion
of the activity is to be found in the top three
inches of the soil.
fixed contamination in the soils at periods of one
year and moreafter the fallout occurred.
0.008
Well.
Beta Activiry (8-/min/g)
Jetanp
1-IN, INCREMENT OF 80% CORING
Ist
2a
3d
4th
sth
6th
NDA
NDA
7th
8th
oth
3470
*
8
0.80
1.33
4445
1
3
4
140
1, 260
6, 600
1}
10,800
i
2
8
3
1
2
3
2
&) No detectable activity.
“Collections made about February 1, 1955.
57,000
42,000
43,000
68,000
37, 000
35,000
4,000
16,000
40
480
2,100
7,100
24,000
33, 000
30, 000
48, 000
37, 000
49, 000
740
7, 500
oNSmBER |
1
4
&
2]
3|
6|
1]
1
1
7,200
4,300
28,000
30, 000
28, 000
8,000
18,000
250
3,000
6,400
18,000
23, 000
3,600
20, 000
4,000.
10, 500
170
2,000
NDA
100
230
160
160
6,800
26, 000
19,
2,000
14,000
4,400
10, 000
120
1,800
60
200
12,000
11, 000
2,300
3,000
3, 400
10,000
100
1,100
180
4,700
27
160
25 |-.-.----+160
50
Beni)Dente &}
Bom
Otolin,
1to5in,
100 ]----------
Beta Activiry (6-/min/g), IsLanp
Rongelap| Labared){ Kabelle Kabetlo Kabetle
32,400
90 Jenennennncce
960
8, 000
48,000
88,000
96,000
348,000
8, 400
12, 000
850
800
240
© Nodetectable activity.
Collections made about February 1, 1965. Data reported as of March
1, 1958.
130,000]
380}
950
72,000}
6,800]
1,700
93,000}
2,900
400
120
40
70
300
70
7
NDA
60
40
770
160
40
3,300
3,100
42,400
130]
40
2,800
580
97, 000
“0
130
20
140
NDA
60
“Collections made about February 1, 1958. Data reported as of March
t, 1965.
55-66,
NDAindicates no detectable activity.
Table 17—Beta Activity in Soil Samples Taken
From Exposed Soil Profiles (NRDL)*
DEpta (IN.)
NDA
NDA
0.06
NDA
0.08
NDA
348
NDA
NDA
6.43
7.00
0.70
NDA
NDA
0.07
All counts were corrected for the counting efficiency of Sr#-Y™,
Gross beta activity of plant samples was determined in April 1956 and thatof soil and water in May 1956.
Data reported as of March 1, 1955.
Table 16—Summary of Beta Activity in Gross
Samples of Soil (NRDL)*
Tstan
49|NDA]
240
130
670
420
Likiep
oo!
0.08
oc
08,
NDA
NDA
009]
4.97
443]
NDA
0.08
NDA
Soi» (e/m/kg x 1073)
ee
12.
18.
Utirik
NDA(*)
NDA
Depth (ja)
Table 15—Beta Activity in Core Samples of Soil (NRDL)*
Sifo
Water > (c/mfliter x 107)
Cistern.
Ocean...
Lagoon
No. or
CorEs
Eniwetak Eniactok Rongelap
Souree
As suggested in chapter IIT,
Ce!#—Pr™ and Ru*-Rh' make up muchof the
19
Table 18—GrossBeta Activity in Water and Soil Samples * (NRDL)
0.04
NDA
NDA
NDA
0.51 |e
NDA
0.70
Collection date: February 1986.