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bee he ne eet Law
Moo
34
radionuclides in old soils is as follows, in order of greatest
penetrations
cst37
sr’,
sbt?>,
and probably other rare earths.
cof,
6
2n >
1
Cr 44 prt44
1
Eu 39
In the young soils, consisting
almost entirely of parent material, the positions of os37 and
spt2s are reversed and the other radionuclides appear to he
more completely retained in the surface algal crust.
The maxi-
mum concentration of fallout radionuclides remains at the soil
surface, a few inches or less in depth, except in areas where
there has been erosion.
In the eroded areas large particles
containing both soil algae and radionuclides are randomly distributed to a depth of a few inches.
There is some horizontal movement of radionuclides but
such movement appears to be very localized and thus is of little
consequence in the overall picture of distribution.
cst37 ana sr?° are the principal radionuclides entering a
cycle within the soil-plant system.
Any loss from this system
appears to be small (a fraction of one per cent per year), but
a definite conclusion can not be drawn from the data.