| 摘要: |
| 本研究采用常压蒸馏法测量，利用Quantulas 1220超低本底液闪谱仪测量海水样品中氚活度的方法，对影响测量结果的测量时间、无氚水、闪烁液以及二者混合比例等进行研究. 在优化了这几个参数后，使得方法检测限为1.07Bq/dm3.为了检测方法的适用性，本研究课题组参与IAEA海水氚样品测量，测量结果为2.91±0.35 Bq/dm3，与IAEA参考值（2.80±006 Bq/dm3）相对偏差仅为3.9%，证明了该方法测量海水的可行性.此外，与文献值比较，本方法适用于核电厂运行后，邻近海域海水中氚的测量. |
| 关键词: 海洋化学 3H 液体闪烁计数 测量条件优化 海水 |
| DOI： |
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| 基金项目:国家海洋局第三海洋研究所基本科研业务费专项资金资助项目(海三科2014030)；福建省自然科学基金资助项目（2016J05099） |
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| Optimization of liquid scintillation counting conditions for tritium determination in sea water |
| LIN Feng,YU Tao |
| (Laboratory of Marine Isotopic Technology and Environmental Risk Assessment，Third Institute of Oceanography, SOA， Xiamen 361005， China) |
| Abstract: |
| In order to measure tritium activity in sea water with lowlevel liquid scintillation counter PE Quantulas 1220 spectrometer， we studied the measurement time， appropriate background of water， scintillation cocktail and sample/scintillation ratio. The minimal detectable activity of this method is 1.07Bq/dm3 after optimizations. In order to test the reliability of the method， we participated in the comparison measurement of IAEA seawater samples. The result of our sample is 2.91±035 Bq/dm3 which is only 3.9% to the relative deviation of IAEA reference value （2.80±0.06 Bq/dm3）. It proves the feasibility of our method. Compare with the value reported， it is considered that the method is suitable for tritium measurement in waters adjacent to the nuclear power station． |
| Key words: marine chemistry 3H liquid scintillation counter optimal conditions sea water |
