Data on reduction of radioactivity in plants are highly important for making decision on emergency response and remediation of contaminated areas. Dynamics of the ¹³¹I and ¹³⁷Cs concentrations in the weed leaves sampled in the areas affected by the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident in Japan was assessed for the period March–December 2011. The effective half-lives for ¹³¹I and ¹³⁷Cs of 3.8–4.2 days and 7.1–13.3 days in the weed leaves were calculated for the first two months after the deposition. The approach for assessment of the aggregated transfer factors based on the ambient dose equivalent rate was suggested and validated. The geometric means of the soil to the weed leaves aggregated transfer factors were estimated for June–December 2011. Soil to crop ¹³⁷Cs- concentration ratios (buckwheat, brown rice and soybean) were estimated for 2011–2016. Soil to crop concentration ratios were found to decrease in the order of soybean > buckwheat > brown rice. The effective half-lives for ¹³⁷Cs in these crops were estimated to be between 1 and 2.5 years for the period 2011 2016, and longer than 5–7 years after 2016. It was found that these data comply with the Chernobyl related data obtained for similar conditions and complement of international documents on radionuclide transfer in agricultural environment such as the IAEA TRS 472.

有关减少植物放射性的数据对于做出应急响应和污染区域修复的决策非常重要。在日本福岛第一核电站事故（FDNPP）事故影响的地区采样的杂草叶中¹³¹ I和¹³⁷ Cs浓度的动态评估于2011年3月至12月期间进行。131 I和¹³¹ I的有效半衰期¹³⁷在沉积后的前两个月，杂草叶片的Cs为3.8–4.2天和7.1–13.3天。提出并验证了基于环境剂量当量率的聚集转移因子评估方法。估计了2011年6月至12月土壤与杂草叶的几何平均转移因子。估计2011-2016年土壤与作物的¹³⁷ Cs浓度比（荞麦，糙米和大豆）。发现土壤与作物的浓度比按大豆>荞麦>糙米的顺序降低。有效半衰期为¹³⁷这些作物的Cs估计在2011年至2016年之间为1至2.5年，而在2016年之后为5至7年。发现这些数据符合从切尔诺贝利获得的类似条件和国际文件补充的相关数据。农业环境中放射性核素转移的报告，例如IAEA TRS 472。