Study on the interference correction of radioactive nuclide 210Bi in the testing of soil 90Sr
According to the principle that stable isotopes of an element have the same chemical properties as their radioactive isotopes.This study focused on the stable isotopes of strontium,yttrium,lead,and bismuth.Referring to the EJ/T 1035-2011 extraction chromatography rapid method,the study involved collecting and measuring the eluate in batches to draw the elution curves for strontium,yttrium,lead,and bismuth,and explored the adsorption and desorption effects of the resin and verifies whether 210Bi affects the measurement of 90Sr.The correlation between 90Sr and 210Bi was investigated with different activity ratios of 210Bi to 90Sr during the measurement,and the correction method was proposed for the interference of 210Bi during the measurement of 90Sr,which laid the foundation of rapid and accurate analysis of the content of 90Sr in environmental soil samples.The experimental results showed that 210Bi interferes with the analysis of 90Sr by the extraction chromatography method;by adding standard equilibrium solutions to achieve activity ratios of 0.5,1,and 3 for 210Bi to 90Sr,without removing bismuth,the recovery rates of 90Sr spiked samples were 129.7％,165.4％,and 277.9％respectively,indicating that the measurement results of 90Sr were positively correlated with the content of 210Bi in the sample.At an activity ratio of 210Bi to 90Sr ≤ 2,duplicate measurements were conducted,and results were applied to the correction formula.After correction,the recovery rate of 90Sr spiked samples was between 97.9％and 105.2％,verifying the feasibility of the correction method.
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