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Cretaceous aggregate and reservoir effect in dating of binding materials

Michalska D., Pazdur A., Czernik J., Szczepaniak M., Żurakowska M.

Geochronometria

2013

Vol. 40, no. 1

33-41

Lime mortars may contain carbon from different origins. If the mortars are made of totally burnt lime, radiocarbon dating yields the true age of building construction. The presence of carbona-ceous aggregates gives the so-called dead carbon effect, which may generate older ages. Another source of carbon is charcoal present in mortars. An attempt has been made to apply the radiocarbon method to mortars of archaeologically estimated age from the Dead Sea region. Petrographical anal-yses of these samples show the carbonaceous character of the binder and large amounts of limestone aggregate. Determination of the mineral composition of the mortars and comparison with the geology of the surrounding, allows the provenance of the raw materials to be identified. They probably repre-sent the Cretaceous rocks of the Judea Group. Separate radiocarbon dates were made on bulk mortar samples, binder, charcoal fragments and sepa-rated fractions from mortars. In the case of binder-aggregate mixture the reservoir effect correction has been applied.

Sample preparation in the Gliwice Radiocarbon Laboratory for ams 14C dating

Goslar T., Czernik J.

Geochronometria

2000

Vol. 18

1-8

The Accelerator Mass Spectrometry has been used in 14C dating for several years. The 14C concentration is measured in graphite target. In the Gliwice Radiocarbon Laboratory a system to produce graphite targets has been built. This system will be used for 14C dating of terrestrial plant and zooplankton macrofossils in lake sediments, and later, in routine 14C dating of small samples.

First measurements of natural radioactivities of 210Pb in the Institute of Physics, Silesian University of Technology

Goslar T., Ganowicz M., Czernik J., Sikorski J.

Geochronometria

2000

Vol. 18

29-34

In this paper we describe the first measurements of 210Pb concentrations in sediments, performed in the Institute of Physics, Silesian University of Technology, Gliwice. The reliability of our method has been tested by the 210Pb measurements in the sediments of Lake Gościąż. The reasons for the non-monotonic profile of 210Pb in these sediments have been discussed. We also report and discuss the 210Pb measurements in the sediments formed in front of the Skeidarar glacier (Iceland).