Table 4.
Estimated integral whole-body external gamma doses for the first
year and for 30 years. Values include contributions due to
natural background radiation of about 0.027 rem for a first-year
dose and 0.80 rem for a 30-year dose.
For comparison,
the federal
radiation guide (total of external and internal doses) is 0.5 rem
per year for individuals and 5 rem for 30 years for a population
average. These guides are in excess of natural background.
Estimated doses
Case
Description
(rem)
First year
30 year
1
Village on Eneu Island
0.12
2.9
2
Residence in houses already constructed
0.20
4.3
3
4
5
6
along lagoon road on Bikini Island.
Residence in houses already constructed
along lagoon road on Bikini Island with
following remedial actions taken:
se
~
a.
Placing 5 cm of gravel around houses
0.187
4.13
b.
Removing and replacing top 20 cm of
soil around houses
0.18
4.07
.
0.227
4.87
0.20°
4.47
0.28
5.9
0.28
5.9
Residence in Phase II houses constructed
along lagoon road within area 2 of Fig. 7
with following remedial actions taken:
a.
Placing 5 cm of gravel around houses
b.
Removing and replacing top 20 om of
soil around houses
Residence in Phase II houses constructed
within the interior of Bikini Island
.
;
Residence in Phase II houses constructed
within the interior of Bikini Island
“The exposure rates in the immediate vicinity-.of the houses have been
reduced by a factor of two and eight for remedial actions a and b, respectively.
However, we have estimated that only 35 to 40% of the Bikinian's time will be
spent in the vicinity of his house; therefore, the reduction in total dose is
relatively small because the total dose includes the exposure received from
the areas where he spends the other 60 to 65% of his time.
-20-