36
ll.
Buried organic horizons contain more cs37 than adjacent
secs
soil layers.
a£3
BE
iz
5
4
a
:
12.
Roots are generally more radioactive than the surrounding
soil except at the soil surface.
13.
Pumice particles in the soil adsorb radionuclides.
14,
Mechanical mixing by animals in old soils and by erosion in
young soils results in a redistribution of radionuclides
in the surface layers.
15.
cst 37 and sr?? are the principal radionuclides entering a
cycle within the soil-plant system.