Geological Structure of the Quaternary Sedimentary Sequence in the Klaipeda Strait, Southeastern Baltic - The Baltic Sea Basin - page 140

Fig. 6.5 Glaciodislocated
inter-till organogenic
sediments in the core of
boreholes 36917 and 36922

(blue-green), 3 mm PS-11 (purple) and 2 mm FS-1 (violet) colour glass filters man-
ufactured by the LZOS, JSC (Lytkarino Optical Glass Factory), Russian Federation.
For laboratory irradiation a calibrated 60 Co source delivering 6.5 10 -2 Gy/s of

gamma radiation was used. After irradiation all samples were kept for about 1 month
at room temperature to allow the decay of post-irradiational phosphorescence and
to eliminate some anomalous fading-like effects (Jaek et al. 2007 ) .
The paleodose D e was determined by extrapolating the dose-response curves
to zero IR-OSL intensities using the multiple-aliquot additive dose (MAAD) tech-
nique (up to 66 aliquots, 15 mg/aliquot, 11 dose points). Dose rate data are based
on a laboratory NaI (Tl) gamma spectrometry (for details see, e.g. Molodkov and
Bitinas 2006 ) taking into account the in situ water content and the contribution from
cosmic rays. The internal beta dose from the decay of potassium and rubidium
within K-feldspar grains was obtained from the concentration estimates reported
by Huntley and Baril ( 1997 ) and Huntley and Hancock ( 2001 ) .
IR-OSL dating was performed in the Research Laboratory for Quaternary
Geochronology, Institute of Geology, Tallinn University of Technology.

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