The transfer of 226Ra from irrigation water to basil crops was studied in field conditions. A dedicated basil plot was established and divided into test and control subplots irrigated with water having high (2.1 Bq L−1) and low (0.05 Bq L−1) activity concentrations of 226Ra, respectively. The experiment was performed over a period of 18 months during the autumn, winter and spring seasons, altogether eight cycles of growth and harvest. The activity concentration of 226Ra in basil grown in the test subplots was found to increase from a value of 0.6 Bq kg−1 up to 5.1 Bq kg−1 with successive cycles, compared to a mean value of 0.2 Bq kg−1 for basil grown in the control subplots. The increase in activity concentration of 226Ra in basil grown in the test subplots is mainly attributed to its build-up in the soil in which the level of 226Ra was found to increase by ~ 40%. The effective uptake of 226Ra from the irrigation water (via soil) by the basil plants was found to be approximately 0.4%. The maximal radiation dose following consumption of basil crops grown in the test subplots is negligible (~3 μSv/y).

中文翻译：

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罗勒作物从灌溉水中吸收 226RA

在田间条件下研究了 226Ra 从灌溉水中向罗勒作物的转移。建立了一个专门的罗勒地块，并将其分为测试和控制子地块，分别用具有高 (2.1 Bq L-1) 和低 (0.05 Bq L-1) 活性浓度 226Ra 的水灌溉。该试验在秋季、冬季和春季进行了 18 个月，共有 8 个生长和收获周期。发现在测试子图中生长的罗勒中 226Ra 的活性浓度随着连续循环从 0.6 Bq kg-1 增加到 5.1 Bq kg-1，而生长的罗勒的平均值为 0.2 Bq kg-1在控制子图中。测试子区生长的罗勒中 226Ra 活性浓度的增加主要归因于其在土壤中的积累，其中发现 226Ra 水平增加了约 40%。发现罗勒植物从灌溉水（通过土壤）中有效吸收的 226Ra 约为 0.4%。食用试验子区种植的罗勒作物后的最大辐射剂量可以忽略不计（~3 μSv/y）。