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