Comparison of the Capability of Mainstream Uranium Particle Analysis Methods
Particle analysis of environmental swipe samples is an important analytical content in nuclear safeguards,playing an important role in exploring undeclared nuclear activities.After nearly 30 years of development,there are currently two internationally used particle analysis technology routes:SIMS method and FT-TIMS method.This article compares the advantages and disadvantages of the two mainstream particle analysis methods in measuring uranium particle isotope ratios,and the results show that in terms of particle recovery,The particle recovery efficiency of both analysis methods is greater than 45%.If the residual influence of cotton fabric is excluded,the recovery efficiency of the two methods is not significantly different;In terms of quality control difficulty,the background of FT-TIMS method for 234U and 236U is generally less than 0.3 CPS,235U is generally less than 2 CPS,238U is generally less than 25 CPS,and SIMS method for 234U,236U,and 238U is generally less than 0.5 CPS;The 235U background is basically less than 2.3 CPS,and the main difference between the two backgrounds is in the 238U aspect,which has little impact on the actual sample analysis;In terms of particle isotope analysis,there is not much difference between the main isotope ratio analysis results of the two methods.TIMS results are slightly better than SIMS.For 234U/238U,TIMS measurement has better internal accuracy and accuracy than SIMS method.For 236U/238U,it is better than SIMS analysis in receiving UH peak interference.TIMS analysis has better internal and external accuracy and accuracy than SIMS method.
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