锰纤维富集-闪烁室法测定水中痕量226Ra本底干扰研究

Study on Background Interference in the Process of Determination of the Trace of^(226)Ra in Water by Manganese Fiber Enrichment-Scintillation Cell Radon Measurement Method

采用海洋学中广泛使用的水中^(226)Ra浓度测定方法,进行超低浓度水样(<0.2Bq/m^(3))的测定。探讨了测定过程中的各种本底来源和降低本底的措施。采取各种措施后,残余空白本底的总和远远小于12 mBq,满足了测定浓度<0.2 Bq/m^(3)的超低浓度镭溶液的要求。提示了进一步降低本底的可能性。

The^(226) Ra concentration measurement method in water widely used in oceanography is used to measure trace concentration water samples(<0.2 Bq/m^(3)).Various background sources and measures to reduce the background in the determination process are discussed.After taking corresponding measures,the sum of the residual blank background is far less than 12 mBq,which meets the requirements for the determination of trace concentration radium solution with a concentration of<0.2 Bq/m^(3).The possibility of further reducing the background is suggested.