8
100 0 200400
foO
Pacific ocean
Fig.
7.
Meters
<A map of Bikini Island showing specific areas of interest for the
dose calculations.
Existing houses are situated within area l.
Areas 2 and 3 are proposed village sites for future housing units.
The interior portion of the island is denoted by area 4.
the radioactivity from those
islands.
Since the islanders spend a
Gamma exposure rate data
considerable fraction of their time
reported by Bennett and Beck, > He1d,°
in the immediate vicinity of their
Lynch etal.,’ Gustafson, ° Smith and
homes, it may be feasible to take
Moore,” and Robison et a.?° were
certain remedial actions
used for this purpose.
the exposure rates in this area.
Their
to reduce
results, in conjunction with a
For instance, placing 5 cm of clean
simplified area weighting scheme,
coral gravel around the houses out
yielded the values presented in
to a distance of 10 m, a common
Table 3.
practice in the Marshall Islands,
Note that these are rough
estimates since the data are scarce
will reduce the exposure rates by a
and were collected over a span of
factor of two.
almost 10 years.
with clean soil the top 20 cm of soil
The exposure rate
Removing and replacing
over the lagoon was estimated to be
out to a distance of 10 m from the
3.3 uR/h due to the cosmic ray
houses will reduce the exposure
contribution and an additional 0.2
rates by a factor of eight.
uR/h due to naturally occurring
addition, the shielding provided by
radionuclides in the sea water.
the houses themselves will reduce the
-18-
In