all live for the 30 years, is
pi[ps0
{250°{ing
UNbugs
pie $80 (1 - et) = 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.
is 8949/1134 = 7.9 rads.
11,902/550 = 22 rads.
Thus, the per capita dose for this group
For the original 550, the per capita dose is
The ratio of these two to give an estimate of the
fraction of the full 30 year dose received by the children is 0.36.
The assumption of no deaths in the original 550 returning was made for
simplicity and the lack of good death rate data.
We also compared the age characteristics of the Marshallese from Table IV-3
and the U.S. population in 1970.
curve.
This comparison is given in the attached
The slopes are similar above age 35 but the magnitudes are distorted
by the high birth rate in the Marshall Islands.
However, in terms of the
relative risk the similar slopes suggest that if the natural cancer rates
in the two populations are similar, the relative risk for people above 35 in
both populations would be similar because most of the cancer occurs at ages
from about 40 and above.
However, 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.
Using the preceding calculations for a population of 550, calculations
were made for other population sizes.
For a population of 550 (from preceding):