The Migration and Distribution of Tritium Water in Chinese Cabbage(Brassica chinensis)-Soil Ecosystem DYNAMICS OF TRANSFERENCE AND DISTRIBUTION OF ~(95)Zr IN THE TEA-SOIL ECOSYSTEM A KINETIC MODEL OF HTO BEHAVIOUR IN THE SOIL MAIZE SYSTEM THE RADIOACTIVE BACKGROUND OF AGRICULTURAL ECOLOGICAL SYSTEM AROUND QINSHAN NUCLEAR POWER STATION Migration and distribution of radioactive nuclide Zirconium-95 in the aquatic ecosystem DYNAMICS OF ACCUMULATION AND DISAPPEARANCE OF COBALT-60 IN WHEAT-SOIL SYSTEM TRANSFERENCE KINETICS OF RADIONUCLIDE NUCLIDE ~(95)Zr IN FRESH WATER ECOSYSTEM TRANSFERENCE AND DISTRIBUTION OF TRITIUM WATER IN A SIMULATED AQUATIC-TERRESTRIAL ECOSYSTEM THE KINETIC BEHAVIOUR OF STRONTIUM-89 IN THE SIMULATION PADDY