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The ionizing radiation produces electron-hole pairs: Electrons are in the conduction band and holes in the valence band.The electrons that have been excited to the conduction band may become entrapped in the electron or hole traps.

The project objectives first consists in exploring and separating OSL emissions from quartz of different sensitivity to light and to isolate components suited for specific dating applications with the Linear Modulation technique.The OSL dosimeter's maximum equivalent dose measurement for x-ray and gamma ray photons is 1000 rem.This page was contributed by Dr Georgina King from the Aberystwyth Luminescence Research Laboratory in the Institute for Geography and Earth Sciences. OSL is used on glacial landforms that contain sand, such as sandur or sediments in glacial streams. However, room exists for a chronology of sand profiles for the northern margins of the Thar Desert.The Ghaggar River flood plain at Rajasthan, northwestern India, in the northern margin of the Thar Desert, is bordered by sand dunes.Testing improved techniques (LM-OSL) to recognize incomplete or inhomogeneous signal resetting at deposition and to precisely determine the true burial dose. Extending the upper limit of luminescence dating through use of RTL emissions from heated and from sedimentary quartz. Improving and ensuring of dose rate calculations using different low-level methods including modeling of disequilibrium and spatial non-homogeneity if applicable. Comparing dating results from loess with independent chronologies and other high resolution records of rapid climate change.Several studies have used luminescence dating to investigate sand mobilization activity in extreme western areas and the southern margin of the Thar Desert, India.Elucidation of the environmental changes of the Ghaggar Basin requires knowledge of many aspects of sand dune formation.We measured optically stimulated luminescence (OSL) using the single aliquot regenerative-dose (SAR) protocol for sand of eight palaeo-dunes and two flood silts of both sides of the present Ghaggar Basin and Chautang Basin flood plains.We analyse the quartz or feldspar minerals in sand deposits. When these quartz or feldspar minerals are exposed to the ionising radiation emitted by the radioactive isotopes in zircons, electrons within the crystals migrate and become trapped in their crystal structure. The number of trapped electrons depends on the total amount of radiation that the mineral has been exposed to. If we assume that the radiation dose rate of the sediment has remained constant over time, then if we measure that dose rate, we can calculate the sample age. Under stimulation of light the electrons may free themselves from the trap and get into the conduction band.From the conduction band they may recombine with holes trapped in hole traps.




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