Oo
* (1.038*) dx -
A is the half-life of decrease of the radition dose, taken here as 30
years.
oo
Vee
sThis integral cannot be solved analytical
An approximate solution
was obtained by calculating this function for each of 30 years and
summing.
This gave 8949 rads for the total population including the
original 550.
The total dose received by the original 550, assuming
P
' - 222
(i-e
-At
)
~
that all Live for the 30 years, is
= 11,902 rads
-
For those born after the return, the population. would be the
difference between the total population in 30 years, the number of
deaths and the original 550 people or 1134.
Thus, the per capita dose
for this group is 8949/1134 = 7.9 rads.
For the original 550, the ver
capita dose is 11,902/550 = 22 rads.
estimate of the
The ratio of these two to give an
fraction of the full 30 year dose received by the
children is 0.36.
for
The ossumptton of no deaths in the original 550 returning was made
simplicity and the lack of good death rate data.
oe
Onejeans ao
also took-a_briaf—leok—rt She age characteristics of the
Marshallese from Table IV-3 and the U.S. population in 1970. This
comparison is given in the attached curve. ~he—you-ean—see Fhe slopes
are similar above age 35 but the magnitudes are distorted by the high
birth rate in the Marshall Islands.7, However, in terms of the relative,;be
risk the
similar
slopes mestlo
me-‘that if the twe natural cancer rates x
are similar, the relative risk for people above 35 in Doth populations
would ve similar because most of the cancer occurs at age $xabout 40 and
aoove. Howaver, the magnitude of the relative risk in the U.S. used for
the Marshallese will be high by a factor of somewhere around 2-3 because
of the distortion caused by the very high proportion of young people who
have a relatively low natural cancer incidence.