SLIDE 57
Declining continuous intake,
The intake removal rate constant calculated for
each nuclide in the Rongelap and Utirik adult populations is given here.
In
the cases of the Rongelap and Utirik people for who sequential body-burden
a we
avajlable
he constant was fo
to have a positive value for
1350," oS. dee 2355
nd 565.
The 338 data for urine of three adult
males at Rongelap in 1973 and 1976_provided a single tentatiye estimate. The
value of the constant was 7.5 x 10
+ 9.1 x10
d *. For
~~Fe, only one
bioassay estimate was published as a result of studies by the BNL medical
program (Be{2, Co75); thus an estimate was not possible.
For the estimate of
gymlated
Fe intake, the constant was assumed equal to zero.
Thus, for
Fe, radioactive decay was assumed by us to be the only cause of reduced
daily activity intake during the residence interval.
137
Where data were available for comparison, the values of the constant for
Cs and
Sr were found to be similar for both males and females as well as
for residents of both Rongelap and Utirik. The yearly percent decrease in the
atom ingestion rate was computed. A 9% reduction in dietary, Cs was
computed for each year at Ronge Lap and Yeirik. For dietary
~~Sr, an 8%
reduction was estimated.
The
Co and
Zn intakes were reduced rapidly
during the first years post-return to Rongelap Atoll. An 80% per
reduction in dietary
Zn and a 60% per year reduction in dietary
observed for adults.
Also, for agyge males at Rongelap, a tentative value of
3% per year reduction in dietary
Pu was estimated from sparse data.
DECLINING CONTINOUS
INTAKE
Nuclide
Intake Removal Rate
Constant
2Co
2.0x10% 47
nen
1.3x10°% da!
C8
Sr
year
Co were
2.0x10%d!
1.7104 a7
55