In conjunction with the Geosciences Advisory Unit at the National Oceanography Centre in Southampton we are able to offer this technique for precisely dating very recent sediments.
This is particularly applicable in dating sediment accumulation rates for geohazard analysis in subsea engineering projects.
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These isotopes do not occur naturally but are released into the environment by nuclear blasts.
Over 2000 nuclear tests have been carried out since the first atomic explosion took place in New Mexico in July 1945, and the Japanese cities of Hiroshima and Nagasaki were bombed a few weeks later.
Interestingly, the widgets unnecessarily also maintain separate static arrays for standard three-letter month name abbreviations.
I found a way around this that may have broader interest, and could hopefully inspire to a more general solution in an upcoming Cesium version.