We have 6 automated Risö readers for dating sediments; 2 TL/OSL-DA-15, one with single grain attachment, and 4 TL/OSL-DA-20; 3 of which are equipped with a pulsed OSL attachment (one also with a photon timer, and one with radioluminescence and Xray-fluorescence) and the other with a stand-alone pulsing box.

Quartz samples are stimulated with blue LEDs emitting at 470 nm, and OSL signals are detected through a UV filter (between 280 and 380 nm). Feldspar samples are stimulated with IR LEDs emitting at 870 nm, and IRSL signals are detected through a combination of blue filters (between 380 and 460 nm).

Quartz is used to date young sediments ranging from a few years to ~100 000 years. Feldspar is mainly used for dating older sediments up to ~ 300 000 years old.

Recent publications

Timing of fluvial sedimentation in the Upper Rhine Graben since the Middle Pleistocene: Constraints from quartz and feldspar luminescence dating. - Boreas, 47 (1): 256-270.
2018, LI, Y., TSUKAMOTO, S., FRECHEN, M. & GABRIEL, G.

Pulsed IRSL: A stable and fast bleaching luminescence signal from feldspar for dating Quaternary sediments. - Quaternary Geochronology, 41: 26-36.
2017, TSUKAMOTO, S., KONDO, R., LAUER, T., & JAIN, M.

New age constraints from the SW Baltic Sea area – implications for Scandinavian Ice Sheet dynamics and palaeo-environmental conditions during MIS 3 and early MIS 2. -Boreas, 46: 34-52.
2017, KENZLER, M., TSUKAMOTO, S., MENG, S., FRECHEN, M., & HÜNEKE, H.

The Agh Band loess-palaeosol sequence – A terrestrial archive for climatic shifts during the last and penultimate glacial–interglacial cycles in a semiarid region in northern Iran. - Quaternary International, 429: 13–30.
2017, LAUER, T., VLAMINCK, S., FRECHEN, F., ROLF, C., KEHL, M., SHARIFI, J., LEHNDORFF, E. & KHORMALI, F.

Contact

Dr. Sumiko Tsukamoto
 +49 511 643-2799

Dr. Astrid Techmer
 +49 511 643-2540