A method of measuring the tritium in seawater based on electrolytic enrichment and ultra-low background liquid scintillation counting techniques was established.The different factors influencing the detection limit we...A method of measuring the tritium in seawater based on electrolytic enrichment and ultra-low background liquid scintillation counting techniques was established.The different factors influencing the detection limit were studied,including the counting time,the electrolytic volume of the seawater samples,the selection of background water,scintillation solution and their ratio.After optimizing the parameters and electrolyzing 350 mL volume of samples,the detection limit of the method was as low as 0.10 Bq/L.In order to test the optimization of system for this method,of the 84 seawater samples collected from the Arctic Ocean we measured,92%were above the detection limit(the activity of this samples ranged from 0.10 Bq/L to 1.44 Bq/L with an average of(0.30±0.24)Bq/L).In future research,if we need to accurately measure the tritium activity in samples,the volume of the electrolytic samples will be increased to further reduce the minimum detectable activity.展开更多
建立了一套水中氚的电解浓集装置,一次可以电解12个样品。水样初始体积为250 m L,电解后的体积是8 m L。每个电解槽的电压3.0±0.2 V,电流12±1 A,电解后样品中氚的浓缩倍数为20±0.5倍,完成电解总共需要72 h。用Quantulus ...建立了一套水中氚的电解浓集装置,一次可以电解12个样品。水样初始体积为250 m L,电解后的体积是8 m L。每个电解槽的电压3.0±0.2 V,电流12±1 A,电解后样品中氚的浓缩倍数为20±0.5倍,完成电解总共需要72 h。用Quantulus 1220液体闪烁谱仪测量,仪器本底1.0 cpm,测量时间600 min时,最低探测限可达0.12 Bq/L。展开更多
基金The project sponsored by the Scientific Research Foundation of Third Institute of Oceanography,Ministry of Natural Resources,under contract No.2020012the Join Project of Xiamen Marine Research and Development Institute under contract No.K191301.
文摘A method of measuring the tritium in seawater based on electrolytic enrichment and ultra-low background liquid scintillation counting techniques was established.The different factors influencing the detection limit were studied,including the counting time,the electrolytic volume of the seawater samples,the selection of background water,scintillation solution and their ratio.After optimizing the parameters and electrolyzing 350 mL volume of samples,the detection limit of the method was as low as 0.10 Bq/L.In order to test the optimization of system for this method,of the 84 seawater samples collected from the Arctic Ocean we measured,92%were above the detection limit(the activity of this samples ranged from 0.10 Bq/L to 1.44 Bq/L with an average of(0.30±0.24)Bq/L).In future research,if we need to accurately measure the tritium activity in samples,the volume of the electrolytic samples will be increased to further reduce the minimum detectable activity.
