10n
the
represent instantaneous values rather than incremental values. This was because the sampling
periods for whole-body counting and unne colJection were very short relative to the intake
period. Addiuonalls. one |. of 24-hr unne sampies (which ever was less) were collected. This
reduced the influence. of mological vanuauon of
aCUVIS concentrauor between morning anc
evening voids. Since urine-activity concentrauion data were usec in vjuauon (1), urine
excreuon rales which were dependent on sen
were adopted tram data in JCRP Publication 23>
(CRP74;.
Values for the quanttues not measured directly and used in equations (1) and i2) wer
taken from the Interature (ICRPS9: ICRPS6s.
ICRP69: ICRP74, ICRP79, Ki78). Coban was
igle
complexed compound. therefore /, was se. at 0.3
(ICRP79). The value off. for “Pu was taken as
"ive
sed
“ate
“TEV
vf k
ult
inOr
uywas
ate
Jue
v1ty
ifn.
dV
of
ary
asi-
Zon
om
ae ee apm te reeks nee ee
the
assumed to be in the form of an organially
the International Commission on Radiologicai
single uptake whole-body retention functions
pads mass differences to vield commuttec
effecuve dose equivalent per unit activity ingested bx a Marshallese aduit.
Co:
05e— #4 0307 fo 7100"
Cg:
0.1 eo 3 «10° ey 0.9e-83* 1G~“t.
67 n-
0.24073 OL OTe mE.
Sr:
0.73 e723 * or 4 GIG e 237 eo
HOP eTa Q peck ees,
+0 17 e725 xin":
Fe 1.0e735*"*. and
239Py-
ons,
re,
was based on use of both equanons (1) and (7)
The average dietary removal rate constant. &.
was first determined using equation {]} and
sequential ufine-acuvity concentration data.
Once the average & was determined. equations
(li) and (2) were set equai to each other and the
body burden was calculated for each unne
measurement. Alter the bods burden was determined. dn estimate of P was made using equation (1) and the average value tor &. In this way
am average value for P wa: obtamed trom all
the urme Sata.
To obiain the S0-yr cumuidtec intake. equation (2) was solved for g and the nghthand side
aT ihe eg uauion was integrated over an ingestion
imterva. of SO yr. Total intakes were related to
comm ied effecuve dose equivalents bx using
conversion factors “committed effective dose
equivalent per uml aclivity ingested” given by
Protection (ICRP79). The committed effecuve
dose equivalent per unit activity ingested giver:
given below for adults were based on ICRP
models and were not corrected for radioactive
decay. These functions. which were used for
making an estimate of aduli intake. were:
en.
the
erla
Cs,
on-
rs
ie
10-* (ICRP79). The longest term rate constant
for Cs was found to be a function of body
mass. The vaiue of this rate constant was adjusted for a 60kg body mass according to
formulas given by Miltenberger (Mi&1). The
om
val
ay
E. T. LESSARD er ui
0.45 7 b9* 1 4 45 en 48x 10%
by ICRP was multiphed by 1.17 te correct for
Statistical analysts of data
The aduh average standarc deviation far
"Cs. Zn or “Sr atom ingestion rate on the day
of return. P . and the dietary removal rate
constant. k. were determined from a set of
calculated values derived from a set of adul:
body-burden measurements and equation (7:
The standard deviation for the adult average
50-yr cumulated intake was determined by
propagation of error techniques involving firs:
and second order partial derivatives and partia!
cross derivatives (Be69). To estimate the error.
partial cross derivatives and partial derivatives
were determined for k and P° with respect to
the 50-yr cumulative intake.
was
heir
Was
ides
where ¢ was in days. An average 60-kg adult
Since only one measurementfor adult average
*Fe body burden was available, the relative
standard deviation of the adult average P* was
3per
weights in the study populations (Con56; Co58;
Co59; Co60; Co62; C063; Co67; Co70; Co75:
of individual adult P°’s which were determined
from the 1970 individual adult “Fe body bur-
dens. Only two values for the set of adult
Anestimate of body burden for “Pu and ”Sr
able and therefore the same method was em-
+0.) e793!
ugh
aeee
sty
body mass was chosen based on the values
observed for male and female adult body
Le80b).
assumed to equal the relative standard deviation
average "Co and *’Pu body burdens were avail-