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VERA Seminar

The half-life of 32Si

Uwe Morgenstern, National Isotope Centre, GNS Science, Lower Hutt, New Zealand
Isotope Hydrology & Water Dating Lab

Measurements made of the half-life of 32Si over the past four decades using a variety of techniques are highly scattered [1]. Even though the scatter is less in the more recent measurements, the half-life is still not known sufficiently. Despite difficulty in measurement, indicated half-lifes of about 100 years made 32Si a potentially very attractive tool in geochronology for the study of anthropogenic impacts.

All of these half-life measurement methods have their problems, reflected in the scatter of the results. We have now, in collaboration with ANU, for the first time measured the 32Si decay directly in a robustly dated Antarctic ice core covering the last 1,000 years, using the highly sensitive AMS technique. The results indicate a  significantly lower half-life of 32Si.

[1] L.K. Fifield, L.K., U. Morgenstern, Silicon-32 as a tool for dating the recent past, Quaternary Geochronology 4 (2009) 400-405. doi:10.1016/j.quageo.2008.12.006


Dienstag, 09.04.2019    16:00 Uhr

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