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A DIRECT ESTIMATE OF THE INITIAL CONCENTRATION OF 14C IN THE MOUNTAIN AQUIFER OF ISRAEL

Israel Carmi, Joel Kronfeld, Yoseph Yechieli, Elisabetta Boaretto, Miryam Bar-Matthews, Avner Ayalon

Abstract


Five radiocarbon analyses were performed on 5 different sources within Soreq Cave, which was used as a model for the Judea Group Aquifer of Israel (pMCq0). The transit time of rainwater through the roof of the cave to sources within it had been determined with tritium. From this information, the year of deposition of rain on the roof of the cave, which later appeared in one of the sources, was estimated and the atmospheric 14C concentration at that time was ascertained (pMCa0). The parameter Q = pMCq0 / pMCa0 was found to be Q = 0.60 0.04. This makes it possible to calculate the age of water in any well in the Judea Group Aquifer of Israel by measuring its 14C concentration (pMCqt) by use of the decay equation and applying Q.

Keywords


absolute age;aquifers ;Asia ;C 13 C 12;C 14;carbon ;cave environment;Cenozoic ;central Israel;concentration ;Cretaceous ;dates ;flows ;geochemistry ;ground water;hydrochemistry ;isotope ratios;isotopes ;Israel ;Judea Group;Mesozoic ;Middle East;Quaternary ;radioactive isotopes;rates ;Soreq Cave;stable isotopes;terrestrial environment;upper Quaternary

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