brought about by reactions with the new environment.
3.
Dilution of the newly introduced material into the
environment by the processes of advection,
diffusion and,
turbulent
to a limited extent, molecular diffu-
sion.
.
4,
Sorption to suspended and settling particles in the
water and to bottom sediments.
5.
Biological concentration in various parts of the
biota.
The fundamental physical and chemical processes contributing to the dispersion of radioisotopes in a marine environment present problems in measurement of such complexity that
information,
based on guch measurements,
and sufficient for
adequate description of these processes is limited.
Needed are
detailed oceanographic data concerning the movement and inter-
change of the waters of the great variety of marine environments and physico-chemical data concerning the equilibrium
relations between the elemental components of the complex
matrices which constitute the various parts of the sea.
The biota resident in a particular environment are gen-
erally sensitive to the chemical and physical features
characterize that environment.
which
The addition of radiomaterials
into a marine environment from fallout or the discharge of