【摘要】 作者在建立的人工小生境中,研究了具有生态学意义的¹³⁷Cs、¹³⁴Cs、⁶⁵Zn、⁶⁰Co、⁵⁹Fe、⁵⁴Mn等核素在海水、底质及海洋生物间的转移规律.本文是该项研究的第一部分,研究悬浮物、底质对核素的富集和吸附,考察了核素进入海水后的初始状态.更多还原

【Abstract】 The paper presents the first part of a research work on transfer of radioactive nuclides from sea water to sediments and marine organisms. 137Cs, 184Cs,65Zn,60Co, 59Fe, 54Mn were added to sea water in an aquarium of 1.2 ton, in which the sediments were laid on the bottom. The concentration factors of these nuclides in suspension and sediments were determined, respectively, by means of super-filtering and S-80 multi-analyser with Ge (Li) gamma-ray detector. It was found that the concentration factors of 137Cs and 134Cs were less than those of 65Zn,60Co, and 54Mn in the suspension for two to three orders; 59Fe in filtered sea water was not detectable. It was shown that after nuclides entering sea water, 137Cs and 134Cs were mainly in ionic state, and 65Zn, 60Co, 59Fe and 54Mn in particle or colloidal state. The concentration factors (96 h) of these nuclides in sediments were less than that in suspension also for two to five orders. Thus, a conclusion may be that adsorption rate of nuclides by sediments is slower.更多还原