Beryllium-7 activity concentration in plants on the Loess Plateau, China

Beryllium-7 activity concentration in plants on the Loess Plateau, China
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中国黄土高原植物中铍7活性浓度

DOI:
10.1007/s10967-011-1078-y
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发表时间:
2011-04
影响因子:
1.6
通讯作者:
Zhang, Bo
Zhang, Bo
中科院分区:
化学4区
文献类型:
--
作者:
Zhang, Fengbao;Yang, Mingyi;Zhang, Bo

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2005年生长季,对黄土高原植物体中天然宇宙源放射性核素铍-7(7 Be)的放射性浓度进行了测量。7月27日的7 Be质量活度浓度在草本植物中为34.8至147.1 Bq kg− 1,在亚灌木中为47.6至116.1 Bq kg− 1,在作物中为15.7至56.8 Bq kg− 1。在生长季节,草本植物混合物的7 Be质量浓度和面积放射性浓度分别从66.8 Bq kg− 1和0.7 Bq m−2增加到288.7 Bq kg− 1和46.5 Bq m−2。在土壤-植物系统中,植物中7 Be的含量在生长季节从0.4%增加到8.4%。7 Be质量浓度和面活度浓度在采样间隔内的增加与降水量呈线性正相关。
The activity concentration of beryllium-7 (7Be), a naturally occurring cosmogenic radionuclide produced in the upper atmosphere, was measured in plants on the Loess plateau of China during the growing season of 2005. The7Be mass activity concentration on July 27 ranged from 34.8 to 147.1 Bq kg−1in herbaceous plants, from 47.6 to 116.1 Bq kg−1in subshrubs, and from 15.7 to 56.8 Bq kg−1in crop plants. The7Be mass and areal activity concentrations of a mixture of herbaceous plants increased from 66.8 to 288.7 Bq kg−1and from 0.7 to 46.5 Bq m−2, respectively, during the growing season. On an areal basis, the fraction of7Be in plants in the soil–plant system increased from 0.4 to 8.4% during the growing season. Positive linear correlations were found between the increases of7Be mass and areal activity concentrations in the inter-sampling intervals and the amount of precipitation.
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