Abstract
For source identification, measurement of 135Cs/137Cs atomic ratio not only provides information apart from the detection of 134Cs and 137Cs, but it can also overcome the application limit that measurement of the 134Cs/137Cs ratio has due to the short half-life of 134Cs (2.06 y). With the recent advancement of ICP-MS, it is necessary to improve the corresponding separation method for rapid and precise 135Cs/137Cs atomic ratio analysis. A novel separation and purification technique was developed for the new generation of triple-quadrupole inductively coupled plasma-mass spectrometry (ICP-MS/MS). The simple chemical separation, incorporating ammonium molybdophosphate selective adsorption of Cs and subsequent single cation-exchange chromatography, removes the majority of isobaric and polyatomic interference elements. Subsequently, the ICP-MS/MS removes residual interference elements and eliminates the peak tailing effect of stable 133Cs, at m/z 134, 135, and 137. The developed analytical method was successfully applied to measure 135Cs/137Cs atomic ratios and 135Cs activities in environmental samples (soil and sediment) for radiocesium source identification.
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