854
BENINSON, RAMOS, AND TOUZET
Table 3— MEAN STABLE STRONTIUM IN FOODS
Food
Numberof
samples
Calcium,
% in ash
Strontium,
ppm in ash
Mg of Sr/
g of Ca
Milk
Baberlac compuesto
24
10
15.0
11.8
140
123
0.95 + 0.08
0.85 + 0.09
Milk Nido
10
11.3
140
1.26 + 0.21
15.6
116
0.92 + 0.06
90
0.59 + 0.09
Eledé6n con fécula y
glicidos
Baberlac simple
Biberol
Yogalmina
Levulosa
10
10
9
11.3
14.2
10
17.4
200
10
25.2
551
2.28 + 0.38
10
6.4
170
2.65 + 0.40
310
200
9.91 + 1.10
0.80 + 0.06
10
Osteolact
10
Nestégeno
10
Eled6n con fécula
10
Secalbum
Nesttin
Quaker
Farex
7
10
15.2
15.3
13.7
14.6
3.13
25.0
171
70
110
140
100
1.50 + 0.20
0.48 + 0.08
1.15 + 0.05
0.72 + 0.06
1.02 + 0.15
0.69 + 0.05
Composite Diets
Age group, months
6 to 9
9 to 12
12 to 24
24 to 36
Adults
10
9
10
10
10
1.21
1.24
1.31
1.35
1.75
+
+
+
+
+
0.20
0.17
0.26
0,21
0,22
information and the mean levels given in Tables 1 to 3; the results
are summarized in Table 4. Strontium-90 intakes are meansof the pe-
riod 1961-1963; annual values show an increase of about 40% in these
three years. Table 4 shows that for young children the strontium/
calcium and the *Sr/calcium ratios in total dietare very close to those
in milk, In particular, the Sr/calcium ratio in total diet averaged over
the first year of life can be taken to be the same as that of milk. Typical intakes are on the order of a few picocuries of Sr and about 1 mg
of natural strontium per day.
90Sr AND NATURAL STRONTIUM IN BONES OF CHILDREN
90s;
Samples of bone were limited at most to a few bones per child.
Skeletal-burden estimations must, therefore, rely on some knowledge
of the distribution of values within the body. There is some evidence of
a very high turnover in the skeleton in the first two years of life,’ and
therefore it will be assumed that bones are uniformly labeled.