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- W2040419128 abstract "The age of two calcrete nodules (C1 and C2) from the Bala section in the region of Ankara, Turkey, is determined by the Electron Spin Resonance (ESR) method. Three radiation-induced ESR signals at g=2.0056 (A signal), g=2.0006 (C signal) and g=2.0038 (broad signal, BL) were observed. The broad signal (BL) intensity was used as a dating signal. The properties of this dating signal are described in this manuscript. The calcrete nodules were irradiated with a 60Co gamma source and measured with an ESR spectrometer (X-band) to obtain the signal intensity vs. dose curve and fitted well with the single exponential saturation functions. Based on this model, accumulated dose (DE) values for dating are obtained using the multiple-aliquot additive dose method. The DE values of C1 and C2 calcretes are 1880±207 and 671±67 Gy, respectively. The ESR ages of the two calcrete samples are obtained by assessing the annual dose rate (D) from the content of 238U, 232Th and K2O determined by wavelength dispersive X-ray fluorescence (XRF) spectrometry. The results are 761±120 and 419±64 ka, respectively, falling into the Middle Pleistocene Epoch in the geological time scale in agreement with the positions of the stratigraphical record." @default.
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- W2040419128 date "2011-02-01" @default.
- W2040419128 modified "2023-09-26" @default.
- W2040419128 title "ESR dating of calcrete nodules from Bala, Ankara (Turkey): Preliminary results" @default.
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- W2040419128 doi "https://doi.org/10.1016/j.apradiso.2010.10.005" @default.
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