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Review of new facilities on a TL/OSL reader for retrospective dosimetry

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  • Physics


template for two-page abstracts in Word 97 (PC) Review of new facilities on a TL/OSL reader for retrospective dosimetry T. Lappa, M. Jaina, M.H. Kooka, K.J. Thomsena, A.S. Murrayb, J.P. Buylaerta,b aCenter for Nuclear Technologies, Technical University of Denmark, Risø Campus, Roskilde, Denmark bNordic Laboratory for Luminescence Dating, Aarhus University, Risø Campus, Roskilde, Denmark Email of corresponding author: [email protected] This presentation summarises recent major im- provements and new attachments to the Risø TL/OSL reader. These have mainly been in response to the ever growing need (i) for higher precision and accu- racy in dose measurements, (ii) to improve our un- derstanding of the physics of the luminescence pro- cesses, and (iii) to extend the dose range. A pulsed stimulation (POSL) and time resolved (TR) single photon counting facility has been devel- oped [1] to aid investigations in luminescence phys- ics, and for the separation of luminescence signals of interest from mixed signals with very different lumi- nescence lifetimes. The TR-POSL facility, with its high temporal resolution in data acquisition (< 1ns), together with the ability to use different stimulation wavelengths (from blue, green and IR LEDs) and temperatures, provides a powerful tool for investigat- ing the complexity of charge movement during OSL; this, for example, has been recently applied to feld- spar luminescence [2]. The standard POSL offers PMT gating in selectable stimulation off-periods thereby providing a routine approach to maximising the signal-to-noise ratio (by suppressing the break- through), and to isolating the signal of choice from mixed samples. An dedicated program for analysis of TR-POSL data can present the data as 3D surface plots and post-process the data to provide standard OSL decay curves derived from up to 5 individually defined gating intervals. There is considerable demand for extending the age range of luminescence dating

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