[en] The accumulative dynamic of ⁸⁹Sr in the kidney bean and its effect on the waters were studied. It is shown that ⁸⁹Sr would transfer to kidney bean rapidly and the accumulation of ⁸⁹Sr in the kidney bean follows a positive exponential relation with time, but follows a negative exponential relation with depth of the soil. After the soil was leached and seeped by rain, the ⁸⁹Sr would enter into waters for 5% and be distributed to each component of waters. The Specific activity of ⁸⁹Sr was low in the waters and hone wort, high in the bottom mud, and highest in the fish and snail, showing that fish and snail can strongly concentrate ⁸⁹Sr in water

[en] The isotope tracer technique was used to explore the effect of different introduction method on accumulation of radioactive strontium in the rice plant. The results showed that concentration of ⁸⁹Sr decreased with time in the rice plant, paddy water and paddy soil for spray and fall treatments. It shows an individual exponential function. For irrigation treatment, change of concentration of ⁸⁹Sr in the rice plant, paddy water and paddy soil was more complicated. The relationship of concentration and time was described as multinomial exponential function. The concentration distribution of ⁸⁹Sr in the paddy soil was identical among three treatments and showed an individual exponential declining with depth. CF value of ⁸⁹Sr was CF_water>CF_soil for each treatment

[en] The ⁸⁹Sr was put into a tea tree-soil system by different ways. The results showed that for ⁸⁹Sr put into the system through the above-ground 1 part of tea tree, its concentration in tea was much higher than that through soil. The concentration of ⁸⁹Sr in older tea was higher than that in shoot for the same treatment. The accumulation and disappearance of ⁸⁹Sr in tea varied with the treatments. For the treatment through the above-ground part, the concentrations of ⁸⁹Sr in older tea and shoot were monotonously decreasing with time. For the treatment through soil the concentration of ⁸⁹Sr in shoot increased initially to a maximum value, then decreased slowly; while the concentration of ⁸⁹Sr in older tea increased quickly in a definite period, then increased slowly to gain a saturated value. In addition, the values of concentration factor of ⁸⁹Sr in the older tea and shoot were determined, too

[en] The adsorption and desorption of ⁶⁰Co in soils and minerals, and the transportation, accumulation, distribution in bean-soil system are studied. The results are as follows: (1) ⁶⁰Co was adsorbed rapidly and desorbed difficultly by soils and minerals. The order of the saturated adsorption rate and K_d (distribution coefficient) of ⁶⁰Co at the balance value was: kieselguhr>paddy soil (loamy clay)>yellowish red soil>kaoline>perlite>silt-loamy soil. The order of D_f (desorption factor) value was: yellowish red soil>silt-loamy soil>kaoline>perlite>paddy soil (loamy clay)>kieselguhr. The dynamic behavior of ⁶⁰Co in the soils and minerals could be described as a closed two--compartment model. (2) After ⁶⁰Co was introduced to the bean-soil system, the concentration of ⁶⁰Co in the root is about 10.4∼23.3 times of that in the stalk, and 30 times of that in the bean pod. The negative correlation between the concentration of ⁶⁰Co in the soil and depth was detected, over 90 per cent of ⁶⁰Co was retained within 6 centimeters of the surface layer, the half residual depth was 2 centimeters. An opened two-compartment model was applied to describe the behavior of ⁶⁰Co in the bean-soil system

[en] Short communications only

[en] The ⁸⁹Sr was added to the tea tree-soil system by different ways. The ⁸⁹Sr in the system through the over-ground part of tea tree, was much more than that through soil. The ⁸⁹Sr concentration in older leaves was higher than in shoot for a definite treatment. The accumulation elimination law of ⁸⁹Sr in leaves varied with the treatments. For the treatment through the over-ground part, the ⁸⁹Sr concentration in older leaves and shoot was monotonously decreased with time increasing. But for the treatment through soil the ⁸⁹Sr concentration in shoot was increased to reach a peak value, and then decreased slowly; while the ⁸⁹Sr concentration in older leaves increased quickly in a period, then increased slowly to attain a saturated value. In addition, the concentration factor of ⁸⁹Sr in older leaves and shoot were determined

[en] Studies on the transport, accumulation, and distribution of ¹⁴¹Ce in simulated paddy and simulated aquatic ecosystem were done. The results are as follows: (1) The concentration of ¹⁴¹Ce in water decreased sharply when ¹⁴¹Ce was put into the paddy through water. The uptake of ¹⁴¹Ce by rice was mainly via root, and redistribution in all parts of rice occurred consequently. ¹⁴¹Ce which was rapidly and almost completely adsorbed by soil could not move readily through the soil, and over 93 percent of that was retained within 4 centimeter of the surface layer. The dynamic behavior of ¹⁴¹Ce in the paddy could be described as a closed three-compartment model. (2) After ¹⁴¹Ce was put into the aquatic ecosystem, the adsorption, condensation, complexation and deposit of ¹⁴¹Ce were quickly generated by physical and chemical processes, and then most of that was adsorbed by silt, aquatic plants and animals. Silt had a great capability of adsorbing ¹⁴¹Ce. The concentration capability of aquatic for ¹⁴¹Ce have the order of: hoenwort>snail>fish. A closed five-compartment model was applied to describe the behavior of ¹⁴¹Ce in the aquatic ecosystem. (9 refs., 2 figs., 7 tabs.)

[en] The absorption of ⁸⁹Sr by rice and effect of application of kieselgur on the absorption behaviour were studied using isotope tracer techniques. The results showed that the ⁸⁹Sr was transferred and accumulated to rice in the ecosystem by absorption action when ⁸⁹Sr was entered the surface water. The specific activity of ⁸⁹Sr in root was the highest. The absorption and accumulation of ⁸⁹Sr in rice were not decreased significantly by application of kieselgur in the surface waster. The specific activity of ⁸⁹Sr in soil follows a negative exponential relation with depth of soil profile

[en] The diminution and distribution of ⁸⁹Sr in the rice-paddy water-soil system and pond water-aquatic-bottom mud system were studied. Mathematical models for simulating it's behaviour have been built. After ⁸⁹Sr was added into paddy water, the ⁸⁹Sr immediately moved to each component of the system. The concentration of ⁸⁹Sr in the water reduced rapidly, however, the concentration of ⁸⁹Sr in the top soil and rice was decreasing. At the time of harvest, the concentration of ⁸⁹Sr was added to aquatic ecosystem, it was immediately moved to each component and the residual concentrations of ⁸⁹Sr were varied with time changing in accordance with polynomial exponential laws. The aquatic could enrich the radioactive ⁸⁹Sr. The maximum concentration factor was 94.7 for snail, 36.7 for fish and only 12.6 for honewort. Therefore, it is obvious that the shells such as snail have higher capacity of decontamination of radioactive Sr in water

[en] The transport, accumulation and distribution of ¹⁴¹Ce in a simulated paddy were studied. The results show that when entering water, ¹⁴¹Ce will be transferred to soil and rice, and the ¹⁴¹Ce concentration in water will decrease rapidly. The ¹⁴¹Ce concentration in rice is higher than that in soil and water. The dynamic change of the ¹⁴¹Ce concentration in the system can be described by multi-component exponential laws. The ¹⁴¹Ce concentrations in water and soil are decreased monotonously with time, and that in rice is increased to a maximum value then decreased. ¹⁴¹Ce is quickly adsorbed by soil and the adsorption rate is higher. More than 95% of ¹⁴¹Ce is detained in 4 cm of soil surface. The ¹⁴¹Ce concentration in soil presents an individual exponential declining with depth of soil