MARSHALLESE EX PERIENCE
245
TABLE I
STRONTIUM-90 IN MARSHALLESE 24-h URINE
APRIL 1962
Group=
EXPOSED
Male
Female
Total
Age
_(yn
No. of
subjects
Srae
Ca
pe/l
mg/!
|}
52£14
Srea /Ca
pe/g
.
5-15
3
9.3321.70*
189418
> 15
7
9.0641.11
175 426
§32 5
s-15
2
9. 60 42.30
25211
426496
> 15
8
15.8942. 50
104412
165 + 26
5-15
5
9,4441.18
41211
284 466
> 15
15
12, 1041, 66
137 416
113 220
5-15
1
28.60+
0
1404 0
2044 0
> 15
4
8.88 42.46
129411
66414
5-15
-
-
> 15
1
10, 24 43,07
100 £49
143 228
5-15
1
28.604
0
1402 0
2044 0
> 15
1l
9.7542 O7
110431
115421
All
5-15
6
12.6343, 34
422 9
2702455
All
> 15
26
11,4521.30
126 £16
114414
NON-EXPOSED
Male
Female
Total
-
-
=
-
-
TOTAL
* Standard error of estimate
age after the age of 20 [12]. Rongelap females invariably had over twice
as high urinary Sr %/Ca ratio as did males, but the basis for the difference
is not readily apparent,
The third method for estimating internally-deposited Sr9° employs the
.Sr9 /Ca ratio of the diet and the discrimination of the body for calcium
against strontium from diet to bone. From an analysis of the diets of 14male
adult Marshallese, an average daily intake of 67.5 pc Sr°° /g Ca was estimated [5]. With the presently accepted discrimination factor of four, an
equilibrium value for body burden of 17 pe Sr™ /g Ca would be expected.
This calculation requires a number of assumptions, for example, that the
dietary intake of strontium remains essentially constant. While this figure
7
occ
is 9 rough estimate, it does agree well with the value calculated from the
ui inary excretion data. The daily intake of Sr was estimated to be 15 pc,
assuming a daily calcium intake of 1 g [9]. From the curve of Sr9° urinary