roughly 5 times the BEIR III risk for 1 rem, or (5x5) to (5x75)/
1,000,000 = 25 to 375 per million or roughly 3 chances in
100,000 to 3 chances in 10,000.
This is, of course, in addition
to the 10.7 chances per hundred normal risk.
Summary
Even using the very conservative assumptions set forth above,
the upper credible limit of genetic risk in consequence of the
return of the Enewetak people - both dri-Enewetak and dri-Enjebi is 0.18 additional case in 1000 births over 30 years.
This means
that it might take five generations before even one extra case
appeared, during which time some 500 or more cases will appear
spontaneously, regardless of where the people reside.