6
’
100 0 200400
es
Meters
Pacific ocean
Fig. 7.
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 al.~? were
certain remedial actions to reduce
used for this purpose.
the exposure rates in this area.
Their
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.
Note that these are rough
estimates since the data are scarce
practice in the Marshall Islands,
.
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
over the lagoon was estimated to be
3.3 uR/h due to the cosmic ray
Removing and replacing
out to a distance of 10 m from the
- 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