We will not discuss further details of these

additional discussion and clarification.

articles and

Doses

listed in this paper are from the Leggett model.

models but refer the reader to the original
their associated references for

Results of Dose Calculations for Rongelap Atoll
Cesium-137 Dose Equivalent

same as that for intake beginning at all other
ages. The annual dose rate in the second year
whenintake begins at birth or at 4 months drops
from the first year doses of 38 mrem and 50 mrem
to about 16 mrem. This result is similar to that
described by lIinuma et al. (1969) for the
Japanese data where the doses to infants and

The dose-equivalent rate calculated for
Rongelap Island using the age-dependent model
for estimating the !57Cs body burden is shownin

Fig. 3. The age-dependent intake of !97Cs is as
described in the “Intake of 79Sr and 137Cs"

children based on whole-body counting wereless

section of the paper for birth (424 pCi/d),

4 months (556 pCi/d), 9 months (773 pCi/d),
1.5y (517 pCi/d), 4 y (594 pCi/d), 12 y
(761 pCi/d), and 18 y (1085 pCi/d), with the
continuous intake in subsequent years decreasing

than adult doses.
The

30-,

50-, and

70-y dose

equivalents are also listed in Table 7 for each
age. The integral 30-y dose equivalent for
intake starting at each age rangeis as follows:
birth, 377 mrem; 4 months, 389 mrem; 9 months,

by radiological decay(i.e., T'/? = 30 y for !37Cs).

The maximum annual dose-equivalent ratesfor
intake at the beginning of each age range are
listed in Table 7.

integral

358 mrem; 1.5 y, 361 mrem; 4 y, 382 mrem; 12 y,

They are birth, 38 mrem;

' 4months, 50 mrem; 9 months, 15 mrem; 1.5 y;

459 mrem, and 18 y, 504 mrem. The corresponding
integral 50-y dose equivalents are birth,

16 mrem; 4 y, 16 mrem; 12 y, 20 mrem;adult,

567 mrem; 4 months, 579 mrem; 9 months,

22 mrem. Thus, the estimated maximum annual

547 mrem; 1.5 y, 551 mrem; 4 y, 572 mrem; 12 y,

dose equivalent for adults is less than for intake
beginning at birth or at 4 months but is about the

649 mrem, and 18 y, 693 mrem. Thus, the integral

30- and 50-y dose equivalent calculated for

Table 7. The integral 30-, 50-, and 70-y effective dose equivalent and maximum annualeffective dose-

equivalentrate for continuous intake of 137Cs beginningat various ages.
Integral dose equivalent

Maximum

30 y

(mrem)
50 y

70 y

Birth

377

567

686

38

4 months
9 months

389
358

579
547

698
667

50°
15

572

692

‘16

Age intake begins

L5y

4y

12 y
18 y

SO001TI.

361

382

459
504

551

649
693

17

671

769
813

dose-equivalent rate
(mrem/y)

16

20
22

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