urine activity concentration-to body burden. Equation 3 was obtained by
integrating Eq. (2).
.
Equations (1) and (2) were used to determine the instantaneous fraction of
atoms removed or added to the atom uptake per unit time, K,, and then the ini-
Ss
tial daily activity ingestion rate required to produce the measured or derived
|
body burden,
Equation (3) was used to determine the number of disintegrations
that occurred in the bodyduring the Tesidence interval ‘ofan individual living
{
on Rongelap or Utirik Atoll,
If the mean residence time in the diet is much much tenet than the resiiiiM
dence interval, then constiiitcontinuous~uptakeis echigved. Falaftons (1) and
—
ns
4
(2) can be converted to the-constant ‘pontinuous equantoys by seolagin Ke with
-\.
Single uptake expressions are obtained by setting ¥ equat tagero,
e
¢
rh
some cases only radioactive decay may remove the nuclide trom/aié
these cases K, would equal zero.
In the case of the fo
In
_ items; for
x/mibios residents,
the maturing of coconut trees during residence on Bikini Atolrcauses a con~
ae
tinuously increasing dietary uptake of 137 ¢,,
>
tive value.
value for
,
fe *Bi
In the case of Rongelap and’ Utirik, Ky was found. to have a positive
137. Cs, 65, Zn, —-60 Co,
and
90 Sr.
gs
.
This indicated that in addition to
radioactive decay, some other removal mechanism decreased the radipactivity in
dietary items during the residence interval.
‘
Thus, ad was toynd' to have 4 nege--:
ag
er:
S33
uk
4
For the nuclide Re, only one meas
surement was published by the BNL Medical Program (Be72); thus an estimate of Ke
was not possible.
are illustrated for adult males and females in Figures 2 to 6.
Two consecutive
“Oo
|e Llakona
urine or body burden data points were used to eliminate the unknown ingestion
Cea wen
TRISTE
whe
Portions of these bioassay data
Bait:hicweeneo
body burden or urine activity concentration.
aeayig Gee
co
Kp was determined by using Eq. (1) or (2) and the population subgroup sean
LU PPere