.
..
. .,.
.
..
A population
of 550 was assumed for the one that might move back permanently to
Bikini Atoll.
Values for other initial populations
were obtained by
ratios of the results.
The total population at the end of 30 years is given by the compounding
equation:
’30
,.
= 550 (1 +0.038)30=1684
The number of births’in 30years
!
B = 0.042 X 550
(1
are given by:
3(I
(1.038)X dx
where x is the time between O and 30.
B
= O 042 X 550
~1.038
This gives
[l 03830 - ~1
= 1277
.
,,
Similarly,
the number of deaths in the 30 year period would be:
Deaths = 0.0054 x 550o
Deaths =
0.0054 x 550
In 1.038
“30
(1.038)X dx
J
[1.03830 - 1] = 164
One other datum needed is the reduction in 30 year dose to those born
after the return because of the decrease
in radiation levels and the
smaller amount of time in the 30 year period that is spent on the island.
For this, the total population dose for those born after returning
assuming
an initial dose rate of 1 rad/year
P = 550 Dl
30
e-ax
is given by:
(1.038X) dx
oI
A is the half-life of decrease of the radiation dose, taken here as 30
years.
Because this integral cannot be solved analytical,
tion was obtained by calculating this function
an approximate solu-
for each of 30 years and