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Guosheng Yang obtained his PhD from Institute of Chinese Academy of Sciences (CAS) in 2012. After working in the National Institutes for Quantum and Radiological Science and Technology, Japan (2012-2014) and CAS, China (2014-2015), he is working in the Institute of Radiation Emergency Medicine, Hirosaki University, Japan mainly to develop novel mass-spectrometric methods to measure trace radioisotopes (135Cs, 236U, 129I, 90Sr, Pu isotopes).


Method Development for 236U in Soil Based on use of the new generation of triple-quadrupole ICP-MS (ICP-MS/MS), a novel technique for measuring 236U activities and 236U/238U ratios in soil has been developed. This simple method incoporated two procedures: a total dissolution with HF + HNO3 + HClO4 followed by single DGA chromatographic separation (Figure 1). The analytical accuracy and precision of 236U/238U ratios, measured as 236U16O+/238U16O+, were validated by using the reference materials IAEA-135, IAEA-385, IAEA- 447, and JSAC 0471[1]. U Isotope in the Soil Contaminated by the FDNPP Accident For 46 soil samples lightly and heavily contaminated as 134Cs by the FDNPP accident, the 236U/238U isotopic ratio ((0.99?13.5)×10- 8) was comparable with those of global fallout values found in surface soil in Japan [2, 3], indicating the release of radioactive U from the FDNPP accident was a trace amount. References [1]Yang et al. (2016) Anal. Chim. Acta 944, 44-50. [2]Sakaguchi et al. (2009) Sci. Total Environ. 407, 4238–4242. [3] Sakaguchi et al. (2010) Sci. Total Environ. 408, 5392–5398.

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