ne oe meinRetiegee *
. Figure 4 indicates that v'*h the use of this
qiodel for biological Aalf-ti. , the highest and
“Icwest doses ter all ages from a given intake of
cesium-187 aiffer by a factor of about two.
This occurs exen though body weights vary by a
~€ector.of tut 20, and bioicgical half-times
wary by a fector of about 10. For the younger
ages, those sess than 1 year of age receive the
‘ighest dosz. Those 70 to 80 years of age may
teceive a comparable dose. However, definitive
ar
an
oe
se
Again, if one assumes that the dietary item
Table 2 also presents the average consumption
‘by each age group relative to consumption by
maics less than 1 year of age (the intake
wormalization factor). The average consumption for males less than one year of age is seen
to be 17.8 ounces per day. This is approximately
one-half liter per day (16.9 oz/day).
Table 2. Average daily fresh whole milk
consumption at home in U.S.*
Average consumption
Age
{yeare)
(Ruid ounces!
—
Wale
TA...
9-4..-2222.
3-8...
20-14. ...-..
$5-19_.. 2...
20-24...
25-29_......
90-34_...-.
85-44. ......
45-54...
55-64 8.
>85..
17.8
17.8
16.6
16.9
16.3
11.8
9.8
8.7
38.3
7.6
8.1
8.6
:
No con-
Normalization factor
consumption/ <I
o
sumption fyear male consumption
(percen
Female
Male
16.3
16.9
14.5
12.7
10.2
7.8
6.8
8.7
8.7
8.4
5.9
6.8
38.0
15.9
20.5
25.0
28.9
35.1
39.2
87.5
30.1
42.0
40.9
25.4
1.0
1.0
08
05
.92
06
55
49
47
43
45
48
Female
.82
.
.38
82
82
3
33
38
i
The doses in figure 4, averagedfor each age
zroup, have been modified by the normalization
factors in table 2 to illustrate the effects that
st
se
i
j
1
ABE Goon)
Figure 5. Total whole body and bone marrow dose from
internal cesium-137 versus age (an assumed pattern of
dietary intake of cesium-187 in milk for males less
than 1 year of age consuming 1 »Ci)
The influence of the pattern of milk consumption in table 2 is to reduce the average
doses for most ages relative to the doses in
figure 4.
The sex-related differences in milk consump-
tion cause males to receive higher average
_doses than females for all ages. The difference
fn dose between ages receiving the highest and ;
lowest values is a factor of about four for...
male and about five for female, and males less
than 1 year of age receive the highest dose.
- The yearly dose that would be received by
various age groups from a continuing daily
intake of cesium-—137 may be estimated by
determining the average cesium-137 body
burden during the year and using the following:
,
05
-8l
72
58
padeet
Someat CaranBatetehaste
Femae Bon te ey FeedCones
December 1965
3
- wi interest is whole milk, the doses in figure 4
wan be modiiied by a pattern of intake for milk.
“fable 2 presents data on average at-home milk
consumption may be underestimated for those,
ages consuming whole milk away from home.
0d lenea
consumption may have on
shown in figure 5.
dita for ages greater than 50 are not available .
and the model suggested may not be really
representative for ages over 50 years.
eensumption as a function of age. Values of
-. verage consumption in table 2 were developed
from a percentage distribution of milk intake
by age (Radiological Health Data, January
31963). This study of at-home milk consumption
v¥'as conducted throughout the United States in
July 1962. Since the study did not include
sonsumption of whole milk outside the home,
npOMNEPR Ee ER me ny
a pattern of m
dose, The result.
B/W
+ where:
(5)
Dee ‘85.7
D,=dose rate (rads per year)
B=average body burden (nanocuries)
and W=body weight (kilograms)
The determination of average body burden
for a continuing intake of cesium-137 is de-
scribed in the following section (see equation
(9) and figure 7).
.
116