year net external effective dose equivalent was estimated to be 1.7x107* sv (1.7 rem) at Rongelap and 4.1x10 “ 2 Sv (4.1 rem) at Utirik. The external exposure trate is expected to decline to nearly natural background levels by the year 2072. The ratio of internal committed effective dose equivalent to fifty-years of net external dose equivalent was 1.1 for Utirik and 1.5 for Rongelap. The in-~ ternal portion of these dose equivalent ratios does not include the contribution 3 . . : from 2 Ppa due to the uncertainty in Pu bioassay data. 19