‘found in the sgile of the nidweatern U. 8, and that perhaps
15 to 17 mc/mi* is the total to be expected for similar
latitudes elsewhere in the world, the difference: being due |
to our proximity to our own weapons testing site’ in. Nevada.’
These 22 mc/mi2 of Sr90 inthe soil of the U. S.' amount to
about 0.040 MPC2/units inthe top two inches of soil where
that the
human body burden’ of Sr90 might well be! as high |
+o erptmetneten aoenine wt
most of the fallout is absorbed. Earlier, it seems reason, able to conclude on the basis of a plausible mechanism for
. the transport of radiostrontium from the soil to! humans
as 70 percent of the concentration in the top soil on which)
people live; furthar avidence seems to indicate that this
should be reduced to batwean 10 and 30 percent. ‘ There- fore at the moment we would expect, assuming that no fur~
ther weapons are fired, th; the body burden fon children
: born now in America evantu..ly would amount to between
0.004 and 0.010 MPC units.
Consideration of the rate of
si
|;
transfer from the stratosphere tq the ground and the rate
of radioactive decay indicatos that the body burden to be
|
|
no
D4
‘anticipated 15 years from now probably will be substantially
oY
the same as it is today.
-
New evidence has van found for the effect of
rainfall on fallout oy studying thrae particulanly arid
regions; in aach crs. the arount of Sr7¥
in the soil was
‘very’much less than would be prodictad from geographical
location alone. iagiens in which people normally live
. have? enough precipitation so that differences in precipi-
tation do not appsar to affsct tha fallout by more than a
- 2/
As used in this spoech one MPC unit is 1 microcurie -
|
of radiostrontium per kilogram of calcium, or 1 micro- |
curie per average adult human, the "maximum,| Permissible
~ concentration."
A aay q
cons
i
sai ew
wees ne
Ey
~
Le
o
anette, oe be
. factor of 2.