Abstract
All three cesium isotopes, natural Cs-133 (stable) plus fission Cs-135 (half-life 2.3 Ma) and Cs-137 (half-life 30 y), were measured in two coastal sediment samples using our thermal ionization mass spectrometer equipped with a retarding potential quadrupole lens filter. The 135Cs 133Cs ratio was about 1 × 10 −9 while 137Cs 135Cs was about 0.5 owing to the decay during the past 30 years from their production ratio of about 1. This appears to be the first detection of fallout Cs-135 in nature. Being an isotope ratio, 137Cs 135Cs is a far more powerful chronometer-tracer than Cs-137 alone. In order to explore its potential, we present briefly two simple models to illustrate how this ratio may be used to quantitatively estimate recent sedimentation and erosion rates.
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