Egyptian Nuclear and Radiological Regulatory Authority, Egypt.
Egyptian Nuclear and Radiological Regulatory Authority, Egypt.
J Environ Radioact. 2021 Sep;235-236:106648. doi: 10.1016/j.jenvrad.2021.106648. Epub 2021 May 15.
The transfer of Cs and Sr from fallout to plants was studied in two successive pot experiments. Five plant species (Oryza Sativa, Tritichum Vulgares, Vicia Faba, Sesamum Orientale and Trifolium Alexandrinum) were grown in pots containing sandy clay loam soil. For simulating foliar contamination, radioactive Cs and Sr solutions were sprayed once with different activity concentrations gently on the shooting system. After 8 weeks of radioactivity application to the above first four plants and 4 weeks to the last one, the total absorption of Cs and Sr and their distribution in different parts of the tested plants were determined. Most of the absorbed Cs and Sr accumulated in shoots with proportions ranged from 70.8 to 81.9% and from 88.9 to 95.0%, respectively for different plants. The absorbed Cs and Sr by grains/seeds followed that of shoots with values ranged from 11.9 to 19.2% and from 5 to 10.9%, respectively. The percentage of Cs absorbed by roots ranged from 6.2 to 10.0% among different plants, while Sr in roots of plants was below the minimum detectable activity of the detector. For Trifolium, most of the absorbed Cs and Sr accumulated in the first harvest (81.9 and 98.6%). The aggregated transfer factors (T) of both radionuclides under foliar conditions were to a great extent similar. The average values of T factors (mkg) of Cs and Sr, respectively, in rice grains were 3.4 × 10 and 1.6 × 10; in wheat grains were 4.2 × 10 and 2.1 × 10; in bean seeds were 4.9 × 10 and 2.6 × 10; and in sesame seeds were 2.8 × 10 and 1.2 × 10. Those T factors of grains/seeds were substantially lower than those obtained with straw of the corresponding plant species.
采用连续两次盆栽实验研究了放射性核素 Cs 和 Sr 在沉降物到植物间的转移。选用 5 种植物（水稻、黑麦草、菜豆、芝麻和三叶草），种植在含有砂壤土的盆钵中。为了模拟叶面污染，用放射性 Cs 和 Sr 溶液以不同的活度浓度一次性轻柔地喷洒到植物的生长点上。上述前 4 种植物在接受放射性物质 8 周后，最后一种植物在接受放射性物质 4 周后，测定植物对 Cs 和 Sr 的总吸收及其在不同植物器官中的分布。大部分吸收的 Cs 和 Sr 积累在植物地上部分，不同植物地上部分的 Cs 和 Sr 分别占总吸收量的 70.8%至 81.9%和 88.9%至 95.0%。植物籽粒/种子对 Cs 和 Sr 的吸收量分别占地上部分吸收量的 11.9%至 19.2%和 5%至 10.9%。不同植物根部对 Cs 的吸收量占植物总吸收量的 6.2%至 10.0%，而植物根部对 Sr 的吸收量低于探测器的最小可探测活度。对于三叶草，大部分吸收的 Cs 和 Sr 积累在第一次收获中（81.9%和 98.6%）。在叶面条件下，两种放射性核素的综合转移系数（T）在很大程度上是相似的。在水稻籽粒中，Cs 和 Sr 的 T 因子平均值（mkg）分别为 3.4×10 和 1.6×10；在小麦籽粒中，Cs 和 Sr 的 T 因子平均值（mkg）分别为 4.2×10 和 2.1×10；在菜豆种子中，Cs 和 Sr 的 T 因子平均值（mkg）分别为 4.9×10 和 2.6×10；在芝麻种子中，Cs 和 Sr 的 T 因子平均值（mkg）分别为 2.8×10 和 1.2×10。这些籽粒/种子的 T 因子明显低于相应植物物种秸秆获得的 T 因子。
