ZENG Xianzhang, QIU Manhua, YIN Mingduan, ZENG Wenyi, HE Jianhua, WAN Xueguo, CHEN Hengliang, LI Jing, TAN Baozeng. An in-situ analysis and measurement of thorium-234, uranium isotopes in seawater[J]. Acta Oceanologica Sinica, 2007, (3): 73-83.
Citation: ZENG Xianzhang, QIU Manhua, YIN Mingduan, ZENG Wenyi, HE Jianhua, WAN Xueguo, CHEN Hengliang, LI Jing, TAN Baozeng. An in-situ analysis and measurement of thorium-234, uranium isotopes in seawater[J]. Acta Oceanologica Sinica, 2007, (3): 73-83.

An in-situ analysis and measurement of thorium-234, uranium isotopes in seawater

  • Received Date: 2006-04-30
  • Rev Recd Date: 2006-12-29
  • A low-level β counting-α spectrum apparatus used for the detection of the β radiation of thorium-234 and α spectrum of thorium-228 simultaneously and an easy operating procedure for the enrichment,radiochemical separating,sampling and measurement of thorium-234 and uranium-238 in the ocean are developed based on the requirements of analyzing export productivity in the euphotic zone via thorium-234-uranium-238 radioactivity disequilibrium.The detecting efficiency both of β and α radiation is higher than 20%.The background of β radiation is less than 0.5 min-1,and the energy resolution of α detector is better than 1%.Total recycle ratio of thorium-234 is about 75%.Using the above apparatus and procedure,the radioactivities of dissolved thorium-234 and uranium-238,particle thorium-234 and uranium-238 in seawater of the South China Sea,the Southern Ocean and the Arctic Ocean were analyzed.
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      沈阳化工大学材料科学与工程学院 沈阳 110142

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