Innovative ICP-MS/MS Method To Determine the Cs/Cs Ratio in Low Activity Environmental Samples.

The Cs/Cs isotopic ratio is a powerful tool for tracing the origin of radioactive contamination. Since the Fukushima accident, this ratio has been measured by mass spectrometry in several highly contaminated environmental matrices mainly collected near nuclear accident exclusion zones and former nuclear test areas. However, few data were reported at Cs environmental levels (<1 kBq kg).