Abstract
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. The 7Be mass activity concentration on July 27 ranged from 34.8 to 147.1 Bq kg−1 in herbaceous plants, from 47.6 to 116.1 Bq kg−1 in subshrubs, and from 15.7 to 56.8 Bq kg−1 in crop plants. The 7Be mass and areal activity concentrations of a mixture of herbaceous plants increased from 66.8 to 288.7 Bq kg−1 and from 0.7 to 46.5 Bq m−2, respectively, during the growing season. On an areal basis, the fraction of 7Be 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 of 7Be mass and areal activity concentrations in the inter-sampling intervals and the amount of precipitation.
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Acknowledgments
The authors would like to thank Mr. David Warrington for his helpful comments and for editing the manuscript. The work was supported by the National Basic Research Program of China (973 Program) (No. 2007CB407201), the National Natural Science Foundation of China (No. 40901127, 41071194) and the Special-Funds of Scientific Research Programs of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau (No.10502-Z12-6).
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Zhang, F., Yang, M. & Zhang, B. Beryllium-7 activity concentration in plants on the Loess Plateau, China. J Radioanal Nucl Chem 289, 353–359 (2011). https://doi.org/10.1007/s10967-011-1078-y
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DOI: https://doi.org/10.1007/s10967-011-1078-y