摘要
以硕大藨草为材料,采用多核素示踪法研究了该海草作为河口区放射性污染指示物的可能性。结果表明,硕大藨草对^(137)Cs、^(65)Zn、^(60)Co、^(59)Fe、^(54)Mn等核素的积累与核素浓度的相关系数均>0.71;硕大藨草浓集上述核素进入第8天就趋于动态平衡;土壤中的核素经一个月洗脱后,植物体内核素的残留量最低仍达 9.2％,处于可检测范围内。测定了地上茎从海水中及根部从土壤中吸收的核素分别在根部、地下茎、地上茎的浓集系数,结果表明前者的吸收能力大于后者。再通过浓集系数公式的换算,可以同时反映海水、土壤两方面放射性的污染程度。
A sea weed (Scirpus grossus Linn ) was taken as an experimental plant to indicate radioactive pollution in estuaries. The results showed that the accumulation of 137Cs,65Zn, 60Co, 50Fe and 54Mn hy Scirpus grossus was proportional to their concentration in the soil. After the nuclidcs in the soil were washed out for one month, more than 9. 2% of the nuclides in Sctrpus grossus still remained , within the detection limit . Absorption of the nuclides from water by the stem above soil was larger than that from soil by the root. The concentration factors of the root . the stem underneath soil and stem above soil for the nuclides were determined. Radioactive pollution degrees of both the sea water and the soil can be deduced by means of conversion of the concentration factor's formula.
出处
《核技术》
CAS
CSCD
北大核心
1992年第12期744-748,共5页
Nuclear Techniques
基金
国家自然科学基金
