| ZENG Xianzhang,QIU Manhua,YIN Mingduan,ZENG Wenyi,HE Jianhua,WAN Xueguo,CHEN Hengliang,LI Jing,TAN Baozeng. 2007. An in-situ analysis and measurement of thorium-234, uranium isotopes in seawater. Acta Oceanologica Sinica, (3):73－83 |
| An in-situ analysis and measurement of thorium-234, uranium isotopes in seawater |
| An in-situ analysis and measurement of thorium-234, uranium isotopes in seawater |
| Received:April 30, 2006 Revised:December 29, 2006 |
| DOI： |
| Key words:ocean β counting-α spectrum apparatus radiochemical separating thorium-234 uranium-238 |
| 中文关键词: ocean β counting-α spectrum apparatus radiochemical separating thorium-234 uranium-238 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | ZENG Xianzhang | Key Laboratory of Global Change and Marine-Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | xzh_zeng@126.com | | QIU Manhua | Key Laboratory of Global Change and Marine-Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | YIN Mingduan | Key Laboratory of Global Change and Marine-Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | ZENG Wenyi | Key Laboratory of Global Change and Marine-Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | HE Jianhua | Key Laboratory of Global Change and Marine-Atmospheric Chemistry of State Oceanic Administration, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | WAN Xueguo | China National Nuclear Corporation, Beijing Nuclear Instrument Factory, Beijing 100020, China | | | CHEN Hengliang | China National Nuclear Corporation, Beijing Nuclear Instrument Factory, Beijing 100020, China | | | LI Jing | China National Nuclear Corporation, Beijing Nuclear Instrument Factory, Beijing 100020, China | | | TAN Baozeng | China National Nuclear Corporation, Beijing Nuclear Instrument Factory, Beijing 100020, China | |
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| Abstract: |
| 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. |
| 中文摘要: |
| 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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