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Recent progress of $$^{135}$$Cs concentration and $$^{135}$$Cs/$$^{137}$$Cs isotopic ratio measurement

Shimada, Asako 

Cesium-135 is one of the important nuclides to assess the safe disposal of High Level Waste (HLW). Therefore, the calculation code and library to evaluate the $$^{135}$$Cs concentration in HLW have been improved through comparisons with experimental results. On the other hand, even basic data of $$^{135}$$Cs, such as its half-life, have large uncertainty. Because the $$^{135}$$Cs/$$^{137}$$Cs isotopic ratio suggests its origin and introduction date, the ratios in environmental samples are measured to study global fallout from nuclear weapons testing and nuclear accidents. Such measurement methods was attracted attention, in particular, after the accident at the Fukushima Daiichi Nuclear Power Station. Measurement of the $$^{135}$$Cs/$$^{137}$$Cs isotopic ratio in environmental samples was challenging because the radiocesium has a very low concentration and it co-exists with huge amounts of Ba isotopes, which are isobaric interfering nuclides, are co-exist. Chemical separation methods were developed to eliminate interfering nuclides and improve the performance of the mass spectrometer to enable the measurement of the ratios. In this review, the features of the $$^{135}$$Cs/$$^{137}$$Cs isotopic ratio for each origin and recent developments in measurement techniques are summarized.

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