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5.
A.
Survey Results
Engibe (JANET)
General Description
Engibe, a triangular shaped island situated on the north end of the atoll,
possessed considerable vegetative growth.
Movement through the island was
limited to existing test roads, the shoreline, and a large runway on the
north end of the island.
The island ig the home of a large tern rookery
situated on the northern end of the island.
A survey of the island re-
sulted in measured exposure rates ranging from 10-100 uwR/hour inland and
' 2-4 uR/hour along the beaches.
Scrap metal with contact gamma readings up
to 12 mR/hour was observed.
Exposure Rate Readings
Engibe can be divided into three distinct measurement areas:
the area
north of the airstrip, the area south of the airstrip, and the areas around
the EASY, X-RAY, and ITEM surface ground zeroes (SGZ).
In the inland area
north of the airstrip, the exposure rates ranged from 20-60 uR/hour, while
measurements ranging from 10 to 20 uR/hour were observed in the inland
areas south of the airstrip.
Measurements were made along selected radials from the SGZ's as ground
cover would allow.
At the site of the EASY Event, the maximum exposure
rate observed was 70 uR/hour on a radial of 135° true, 200 feet from the
SGZ, in an area of dense vegetation.
In general, 20 uR/hour was observed
throughout most of this area with the exception of the area east of the SGZ
which was indicating 40-50 uR/hour.
At the site of the X-RAY Event, the
maximum exposure rate observed was 100 uR/hour (120 uR/hour ground contact)
on a radial of 030° true, approximately 400 feet from the’ SGZ (also densely
vegetated).
uR/hour.
General exposure rates around the SGZ ranged from 50-70
At the site of the ITEM Event (the only readily apparent SGZ on
Engibe), the crater of which appears as a large burned out area on the
northern tip of the island, the maximur -xposure rate observed was about
5 uR/hour.
This rather low level is probably due to the lack of vegetation,
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