ray
7
We conclude that the average Cs‘*”? body burdens have remained
essentially constant since.the spring of 1956. The increase of LS’s burden,
for example, is offset by a decrease in subject.
can be ascribed to dietary fluctuations.
» burden.
These change
The estimate of radioactive contamination of the human body under
continual intake of radioactive foods and water would be greatly aided by tk
establishment of a significant parameter describing the radioactivity of bot
Thus, in the last few years, great efforts have been expended in establishir
whether the Sr”/Ca ratio in the diet leads to a reliable evaluation of Sr i
in the human skeleton. Our first efforts along these lines concerning Cs’?
led to the speculation as to whether the Csi37/K in the diet could be regard.
as a reliable parameter for the estimate of Cs!*? body burden. Contrasted
the findings with the Sr*®/Ca, the Cs*7/K in the body was found to be 2.2 ti:
the ratio in the urine of a single individual. (ANL-5679, p. 29-30, JuneDecember 1956}.
Taking advantage of the constancy of Cs'*? burden experienced in th
last year, the excreta of two of the control subjects ( | and ___) were
collected for several days and analyzed for Cs'®’ and K. The pertinent dat»
obtained are shown in Table 6.
1
ra
TABLE 6
subject
>
<
~
g K/day in urine
g K/day in feces
oe
££=
=
=
CS
s
:
S
2.53
.65
=
2.0
uc Cs'3’/day in urine
33.5
40
duc Csi3 /g K in urine
13.2
20
Cs/K in body*:
ratio pees
Cs/K in urine
2.6
4
1.9
*This ratio has been called assimilation ratio
in the body’‘of the paper.
.
‘oe
&
An assimilation ratio of 1.9 was found for subject_____ and 2.6 for
subject =. The average value is 2.2 which is in agreement with the
bei Zils
previously“reported value for RER. Owing to the low radioactivities due
to K* and Cs!3" in the feces of these subjects and the relatively high content of Ra@& therein, due to natural intake, it has not been possible to de-
termine the fecal Cs'*7/K by simple gammaray analysis alone. Efforts
to measure this ratio are currently under way, Additional pertinent infor
mation is given later in the body of this report, concerning studies on
. Marshallese subjects of relatively high Cs 37 content, who, however, coulc
not be considered in equilibrium with their environment at the time of
measurement.
“BE
ee er
Ciret
ge
ede
io Peed
. Dn, .+e
PRIVACY ACT MATERIAL REMOVED
.
eo
i