Northern Marshall Islands
Aerial Radiation Survey
Preliminary Data Summary
(Continued)
Rongelap Atoll
Average Terrestrial Exposure
Rate * (y R/h at 1 meter)
Island
Number
Frame
Number
Marshallese
Total
Name
Gross Count
137s
Component
§°Co
Component
F-29
172
Enybarbar
3.5
3.0
0.3
F-30
172
Bigannuo
6.2
6.5
0.5
F-31
80
5.1
5.3
0.5
F-32
80
Erapuotsu
I.1
7.2
0.5
F-33
80
Eniaetok
F-34
200
-
-
F~35
200
-
-
-
F-36
200
-
-
_
F-37
200
-
-
-
F-38
200
2.8
2.6
0.3
F-39
196
-
-
-
F-40
196
-
-
-
F-41
196
Bokujarito
-
-
-
F-42
216
Rongelap
3.8
3.6
<0.3
F-43
72
Arbar
2.7
2.3
<0.3
F-44
72
Bikien
-
-
-
F-45
50
Eniroruuri
-
-
-
F-46
50
Eniran
2.9
2.4
<0.3
F-47
50
Tufa
3.7
3.0
<0.3
F-48
56
Arugaren
-
-
-
F-49
56
Burokku
5.9
5.2
0.3
-
-
-
F-50
|
.
Pokoreppu
* Extrapolated from aerial data obtained at an altitude of 38 meters (125 feet)
An additional 3.3 u R/h due to cosmic ray contributions must be added to obtain
the total external exposure rate.