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224Ra and its implications in the East China Sea

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Abstract

The activities of 224Ra in the East China Sea (ECS) were measured by the Mn-fiber adsorption—emanation method. The horizontal and vertical distributions of 224Ra in the ECS in summer and winter were studied. The ranges of 224Ra activities were < lowest limit of detection (LLD)–5.88 Bq/m3 in summer with an average of 0.85 Bq/m3, and < LLD-7.50 Bq/m3 in winter with an average of 0.72 Bq/m3. And the distributions of 224Ra in the surface water were similar in these two seasons, decreasing rapidly with the increasing distance from the coast. The high 224Ra area was located within 30–100 km offshore and the lowest activities appeared in the Kuroshio Current. The vertical distributions of 224Ra showed two different characteristics. The horizontal and vertical eddy diffusion coefficients calculated by the one-dimensional state model of 224Ra were (7.1–88.9) × 106cm2/s and 2.18–163 cm2/s, respectively. The upwelling rates off Zhejiang Province were calculated from 224Ra vertical distribution, which varied from 8.4 × 10−3cm/s to 13.3 × 10−3cm/s in summer and 16.3 × 10−3cm/s to 16.8 × 10−3cm/s in winter.

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Acknowledgment

This study was supported by the Key Project of Chinese National Programs for Fundamental Research and Development(973 program)(No.2005CB422300).

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Authors and Affiliations

  1. Key Laboratory of Global Change and Marine-Atmospheric Chemistry of State Oceanic Administration, The Third Institute of Oceanography of State Oceanic Administration, Xiamen, 361005, China

    Wu Men

  2. College of Oceanography and Environment Science, Xiamen University, Xiamen, 361005, China

    Wu Men, Fenfen Wang & Guangshan Liu

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  1. Wu Men
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  2. Fenfen Wang
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  3. Guangshan Liu
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Correspondence to Wu Men.

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Men, W., Wang, F. & Liu, G. 224Ra and its implications in the East China Sea. J Radioanal Nucl Chem 288, 189–195 (2011). https://doi.org/10.1007/s10967-010-0898-5

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