Three. These data were collected during the August 1981 Field trip to Rongelap and have been mdified to accurately reflect the typical living pattern of the population at Rongelap Atoll. The effective-dose-equivalent rate from internal CS-137 increases as body mass decreases (see Table Three). This occurs because the increase in s~cific activity which results when body mass decreases more than offsets the decline in the amount of photon energy absorbed by the body. most pronounced in the infant. This effect, is Studying the diet of the infant and measuring CS-137 activity in breast milk will provide information to determine the dose equivalent for persons too young to participate in the persorinelmonitoring program. Recent results for current and previously collectd samples are summarized in Table Four. breast milk The consistent ratio between activity in breast milk and body burden will allow assessment of infant’s CS-137 dose equivalent based on historic body-burden data for the mother. An assessment of the 1982 annual committed effective dose equivalent at lbngelap Atoll is given for the average adult in Table Five. The activity intake data for Sr-90, Fe-55, and CO-60 were based on ext”ropolationof prior body-burden and urine anlayses data, and a mathematical model describing the declining continuous intake pattern which was exhibited in the Rongelap population prior to 1981.” Bi-207 activity was below our minimum detection limits, thus, the impact on total committed effective dose equivalent is insignificant. The intake for CS-137 was based on the 1981 and 1982 field — — measurements and a mathematical model for increasing continuous intake. The total effective dose equivalent of 6.1x1O‘“4Sv (61 ~’em) for the calendar year 1982 is less than the 5X10-3 Sv (500 mrem) annual limit recommended by the International Commission on Radiological Protection (ICRY Publication 26) 3