Ramadan A B, Diab H M, Monged Mohamed H E
Egyptian Nuclear and Radiological Regulatory Authority, Egypt.
Egyptian Nuclear and Radiological Regulatory Authority, Egypt.
J Environ Radioact. 2021 Aug;234:106632. doi: 10.1016/j.jenvrad.2021.106632. Epub 2021 May 4.
The transfer of Cs and Sr from soil to different plants has been studied in two successive pot field-grown experiments. Five plant species (Oryza Sativa, Tritichum Vulgares, Vicia Faba, Sesamum Orientale and Trifolium Alexandrinum) were grown in pots with sandy clay loam soil contaminated with varying amounts of Cs or Sr. The absorption of the radioisotopes was measured in different parts of the plants and their activity concentration was significantly increased with increasing radioactivity of both radioisotopes in the soil. The distribution pattern of the total absorbed Cs or Sr in different plants after soil contamination shows that the shoots of these plants contained the highest percentage of both radionuclides (65.8-73.8% for Cs and 77.3-80.7% for Sr) followed by roots (16.4-22.4% for Cs and 19.5-21.4% for Sr) and finally by grains/seeds (4.9-12.9% for Cs and 0.3-1.3% for Sr). The transfer factors of Sr were higher than those of Cs for shoots of the tested plants, and were in the ranges of 2.3×10 - 4.8×10 and 8.8×10 - 2.0×10 for Cs and Sr, respectively. The transfer factors of grains or seeds were significantly lower than those of roots or shoots. Also, the transfer factors of leguminous plants were higher than those of cereal plants. Regarding Trifolium plant, the highest activity concentration of both isotopes was found in the second harvest samples.
在连续两个盆栽田间种植实验中，研究了铯和锶从土壤到不同植物的转移情况。将五种植物（水稻、普通小麦、蚕豆、芝麻和埃及三叶草）种植在装有被不同量铯或锶污染的砂质粘壤土的花盆中。测量了植物不同部位对放射性同位素的吸收情况，并且随着土壤中两种放射性同位素放射性的增加，其活度浓度显著增加。土壤污染后不同植物中总吸收的铯或锶的分布模式表明，这些植物的地上部分所含两种放射性核素的百分比最高（铯为65.8 - 73.8%，锶为77.3 - 80.7%），其次是根部（铯为16.4 - 22.4%，锶为19.5 - 21.4%），最后是谷物/种子（铯为4.9 - 12.9%，锶为0.3 - 1.3%）。对于受试植物的地上部分，锶的转移因子高于铯，铯和锶的转移因子范围分别为2.3×10 - 4.8×10和8.8×10 - 2.0×10。谷物或种子的转移因子明显低于根部或地上部分。此外，豆科植物的转移因子高于谷类植物。对于三叶草植物，在第二次收获的样品中发现两种同位素的活度浓度最高。
