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up to 400 uR/hour were observed with an average reading of 100 uR/hour.
Readings along the southern portion of Bogon ranged from 10-50 uR/hour.
Scrap Metal
Some scrap metal was observed on both islands, most of it concentrated
‘around the SEMINOLE crater.
Contact readings ranged from 0.3 to 0.5
mR/hour,
Alpha Contamination
No surface alpha activity was detected on Bogairikk or Bogon.
Environmental Samples
The collection of environmental samples was limited to the islands of
Engibe and Runit.
On Engibe, surface (1-2.5 em) and profile (20 cm) soil
samples were collected from the EASY, X-RAY, and ITEM Event sites.
Also,
several surface soil samples were collected at the site of the beryllium
contaminated area on the northwest tip of the island.
Two ground water
samples were collected on the island from the frach water Tene at annronimately 6 to 8 feet in depth.
A surface water sample was obtained from the
water in the ITEM Event crater.
On Runit, surface and depth soil samples were collected from the CACTUS,
LACROSSE, and FIG Event sites.
One ground water sample (from the island's
fresh water lens) was collected and one vegetation (bunch grass) sample
was collected near the FIG site,
All samples are presently being analyzed
by EPA/WERL and the results will be available at a later date.
Conclusions
As a preliminary evaluation, it seems apparent from the cursory radiological survey performed that Runit (YVONNE) presents the greatest radiological
hazard of any of the islands surveyed.
Large quantities of scrap metal are
evident along the reef near the LACROSSE site and to a lesser extent inland.
The maximum contact reading on scrap metal (35 mR/hour) was observed on
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