ESR dating of Soma (Manisa, West Anatolia – Turkey) fossil gastropoda shells

Dose estimation, kinetics and dating of fossil marine mollusc shells from northwestern part of Turkey

“…By looking at the thermal behavior of this signal, it can be deduced that the signal is due to the organic carbon radicals. This behavior is in agreement with the other studies about organic carbon radical signals (Griffiths et al, 1982;Ikeya, 1986;Engin et al, 2006;Aydaş et al, 2010). Organic radicals can be used as indicators of past heating conditions of the fossil shell sample.…”

“…After that, the samples were gently crushed with a mortar and the grains were sieved in order to separate the fraction of 125-250 μm. The separated grains were again etched 0.5% acetic acid for a few minutes in order to remove surface defect signal at g¼ 2.0002 caused by pressure in grinding (Engin et al, 2006). Finally, separated grains were washed with distilled water for a few minutes and dried at room temperature.…”

“…During irradiation, conditions of charge particle equilibrium were maintained. Irradiated samples were kept at 100°C for 1 h for eliminate the contribution of unstable paramagnetic centers as recommended in the literature (Barabas et al, 1992a(Barabas et al, , 1992bEngin et al, 2006). All ESR measurements were carried out with a Bruker X band spectrometer (e-scan dosimeter reader) at ambient temperature under the following conditions.…”

“…In recent years, Electron Spin Resonance (ESR) technique has also been used for dating Quaternary fossils of mammals, human remains and shells of both marine and terrestrial molluscs (Molodkov, 1988; Barabas et al, 1992aBarabas et al, , 1992bMolodkov, 1993;Radtke, 1997, 1999;Engin et al, 2006;Kinoshita et al, 2006, Kerber et al, 2011. This technique is useful for Quaternary fossils because it can determine ages older than the maximum limit of 14 C (about 50,000 years) its upper limit is dependent on the saturation of defects and signal stability in older samples and on the thermal stability of the defects (Ikeya and Ohmura, 1981;Radtke et al, 1985;Shimokawa et al, 1992; Ikeya, 1993; Schellmann and Radtke , 1997;Lopes et al, 2013).…”

Electron Spin Resonance Study of Tertiary Sediments in Mae Moh Basin, Lampang Province

“…Since then, ESR technique has found wide variety of applications in chemistry, physics, biology and even in the process control and clinical analysis. Zeller et al (1967) and McDougall (1968) suggested that ESR could also be used in geology and archaeology (Engin et al, 2006).…”