THE MIGRATION PROCESS OF RADIONUCLIDES IN ARTIFICIAL MICROHABITAT

According to the principle of photosythesis with sunlight and CO₂ by phytoplankton supplying food for marine organisms, while the nitrogenous compounds excreted by marine animals are transferred by bacteria into the nitrate for the use of phytoplankton, an artificial microhabitat is built to investigate comprehensively distributive relationship of ¹²⁷Cs, ¹³⁴Cs, ⁶⁵Zn, ⁶⁰Co, ⁵⁰Fe, ⁵⁴Mn in the parts of the microhabitat. The results show that 78% of the ¹³⁴Cs and ¹³⁷Cs in ion state are present in sea water, with 28% of them nearly homogenous envolved in the exchanging processes of the suspensates and organisms, and that 80% of ⁵⁹Fe, ⁵⁴Mn, ⁶⁵Zn, ⁶⁰Co were concentrated by solid substance, whose motion was mainly controlled by biological processes. The factors affecting the distribution of nuclides in each composition are discussed. As another type of research on the controlled ecological system which is a subject currently studied in the world, the present paper is of reference value for studying quantitatively the migration rule of pollutants in the ocean.