Analysis of glow curves of quartz and transluminescence dating

417-419 Computerised Glow Curve Deconvolution (CGCD) of glow curves of (N, N+10 and N+15 Gy) sedimentary quartz has been studied. Equivalent dose (ED) of the sample has been evaluated using the well-known additive dose method by using the individual glow peaks obtained by deconvolution. For unheated sediments, ED can be evaluated either using 312°C peak or 276°C peak. The high temperature peaks, located by us around 420, 458, 488 and 540°C normally not considered for dating may also be used in case of heated sediments/potteries/bricks. Unlike the random values of trap-depth reported in some recent paper, our CGCD results clearly show a linear relation between E~kTm plot, yielding a physically realistic Urbach’s co-efficient i.e. 27 for quartz. </smarttagtype

Applications of PeakFit software in thermoluminescence studies

297-302Some applications of the commercial software “PeakFit v.4.12” in thermoluminescence (TL) studies have been reported. The “PeakFit” is a simple but convenient, powerful tool in extracting the two most important intrinsic trapping parameters namely, the activation energy (E) and frequency factor (s) of TL peaks of complex glow curves, has been demonstrated. This is shown by considering the glow curves of NaCl recorded with various heating rates. The fourth derivative plots of a set of twelve glow curves of D2O ice excited with a dose 7.6 kGy (e-beam 2.2 MeV) and recorded with linear heating rate of 0.05Ks-1 show clearly the existence of as many as eleven TL peaks in the range 77-250 K. These peaks are located at 102.2±1.8, 117.3±1.0, 127.0±1.3, 134.7±1.2, 144.4±1.5, 153.1±1.3, 164.4±1.1, 173.3±1.2, 182.3±1.5, 193.8±1.8 and 201.0±1.6 K, respectively which is in agreement with the recent finding on structure of glow curves of H2O ice.We also demonstrate that the software is a convenient tool not only to locate but also to integrate satellite peaks that may be used for dosimetry/dating. Using this concept, the Dose Response Curves (DRCs) of dosimetric TL peaks of BaSO4 have been constructed