The total activity of radioactivity in water is a necessary item for daily radiation monitoring of water,Low background α/β measuring instrument is not suitable for the gross alpha and gross beta in high salt water,The low background liquid scintillation method can effectively solve the problem by the advantages of simple operation,high detection efficiency,and can realize α/β.Under optimized conditions,The crosstalk ratio of the alpha calibration in the beta(Kαβ)and the beta calibration in the alpha(Kβα)was 18.6％and 7.50％respectively,the detection limits of gross alpha and gross beta are 0.052 Bq/L and 0.080 Bq/L respectively.The precision(RSD,n=11)and accuracy are studied by three samples with different salt contents.For gross alpha,the relative standard deviation is 6.9％-8.6％,and the relative error is-6.27％-3.33％.For gross beta,the relative standard deviation is 7.6％-9.3％,and the relative error is-4.44％-9.17％.The spiking recovery test was conducted on different salt samples,The spiked recovery rate of gross alpha is between 91.8％-106％,The spiked recovery rate of gross beta is 93.3％-111％.The liquid scintillation method and low background measuring instrument were used to measure the simulated samples with high salts.The results showed that,the measurement result of Low background α/β measuring instrument is deviates from the recommended value because of influence of high salts,but,the measurement results of liquid scintillation method are consistent with the recommended values of simulated samples.The precision and accuracy of liquid scintillation method for measuring high salinity real samples meet the analytical requirements.
关键词
液体闪烁法/总α、总β/高盐份/水体
Key words
liquid scintillation method/gross alpha and gross beta/high salt/water
维普
万方数据