Radioactive cesium isotope ratios as a tool for determining dispersal and re-dispersal mechanisms downwind from the Nevada Nuclear Security Site

Analysis of cesium isotope compositions in environmental samples by thermal ionization mass spectrometry – 1. A preliminary study for source analysis of radioactive contamination in Fukushima prefecture

“…When studying Cs isotopes by mass spectrometry of Cs, isobaric interferences with Ba must be considered [5][6][7][8][9]. Although a higher filament current would enhance the sensitivity of Cs isotope analysis, the typical filament current both of this study and other reports [5][6][7][8][9] was set to approximately 1 A to avoid the isobaric interference of Ba. The mass spectrum obtained in this study shows no peak at atomic mass of 138 (Figure 1), which indicated that no Ba ion was detected during our measurement.…”

“…Because the generation of radioactive 135 Cs depends on the neutron flux, the isotopic ratio of 135 Cs (T 1/2 = 2.3 × 10 6 ) and 137 Cs is used for analyzing the operations of nuclear facilities [5][6][7][8][9]. This suggests that the isotope ratio analysis of the 135 …”

Application of Mass Spectrometry for Analysis of Cesium and Strontium in Environmental Samples Obtained in Fukushima Prefecture

“…Assumed that this precision could be applied for the isotopic ratio of 90 Sr/ stables Sr, the isotopic ratio of 90 Sr/ stable Sr must be higher than 10 6 . For the natural sample, since the Sr concentration ranges from ppb level to several hundred ppm level (Fig.…”

“…3 10 6 ) is also generated during the operation of reactors. Because of the difference in the generation process and the half-life of radioactive Cs, the isotopic ratios of 134 Cs/ 137 Cs and 135 Cs/ 137 Cs have been used for analyzing the operations of nuclear facilities [2][3][4][5][6]. Naturally occurring Sr has four stable isotopes ( 84 Sr, 86 Sr, 87 Sr, and 88 Sr), on the other hand, and the isotopic composition of Sr generated in reactors [1] are totally different from the natural abundance [7].…”

135Cs/137Cs isotopic composition of environmental samples across Europe: Environmental transport and source term emission applications

“…Expected trends in 137 Cs concentrations and 135 Cs/ 137 Cs isotope ratios from European emission source terms A brief discussion of anticipated variations in radiocesium concentrations and isotope ratios for major European emission source terms is given in this section in order to provide context for the results of this work; for in depth analyses of these factors the reader is referred to the following references [UNSCEAR 2000;UNSCEAR 2008;Mackenzie and Scott, 1993;McCubbin et al, 2002;Snow et al, 2015c;Snyder et al, 2012;Taylor et al, 2008;Russell et al, 2015].…”