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

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)


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