The number of births in 30 years are given by: /-- ‘3’ B = 0.042 X 550 / /. / (,-’ (1.038)X dx where x is the time between O and 30. 0.042 X 550 ‘=lnl.038— This gives [1 .03830 - 1] =1277 Similarly, the number of deaths in the 30 year period would be: Deaths = 0.0054 x 550 I Deaths = ~5:3; . 550 (1.038)X dx [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 is given by: P = ( J 550 D, o y e-Ax (1.038X) dx A is the half-life of decrease of the radiation dose, taken here as 30 years. Because this integral cannot be solved analytical, an approximate solution was obtained by calculating this function for each of 30 years and summing. original 550. This gave 8949 rads for the total population including the The total dose received by the original 550, assuming that