“ENCLOSURE IV V-D The total person-years of observation in the 4 study groups (Rongelap exposed, Ailingnae exposed, Utirik exposed, and current unexposed group is 8280. Rongelap exposed 25 years x 60 people = 1500 5002194 Ailingnae exposed 25 years x 16 people = 400 Utirik exposed _ 25 years x 132 people = 3300 Unexposed (800-1500 series) 22 yrs x 140 peo; = 3080