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Aspects of Infrared Radioluminescence dosimetry in K-feldspar

Abstract

Infrared radioluminescence (IRRL) of K-feldspar, detected at peak wavelength of 865 nm, is emerging as a potential geochronometric tool. The present study explores and attempts to optimize the IRRL dating protocols and proposes a revised protocol for estimation of palaeodose. UV light (395 nm; 700 mW/cm2) bleach of 800 s was optimum to remove the trapped charges responsible for IRRL and, reduced the interference of radio-phosphorescence due to prior irradiations. Validation of the proposed protocol was carried out by dose recovery tests on mineral and sediment K-feldspar samples of different provenances. An overestimation in dose recovery was observed and was attributed to difference in sensitivity of natural IRRL and regenerated IRRL. The sensitivity changes were significant and systematic and were documented by repeating bleach-IRRL cycles. Corrections for sensitivity changes between natural and regenerated IRRL, gave reliable results and, have now been included in the proposed dating protocol.

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Infrared radiofluorescence (IR-RF) dating of middle pleistocene fluvial archives of the Heidelberg Basin (Southwest Germany)

–28. [13] Erfurt G and Krbetschek MR, 2003b. Studies on the physics of the infrared radioluminescence of potassic feldspar and on the methodology of its application to sediment dating. Radiation Measurements 37(4–5): 505–510, DOI 10.1016/S1350-4487(03)00058-1. http://dx.doi.org/10.1016/S1350-4487(03)00058-1 [14] Erfurt G, Krbetschek MR, Bortolot VJ and Preusser F, 2003. A fully automated multi-spectral radioluminescence reading system for geochronometry and dosimetry. Nuclear Instruments and Methods in Physics Research Section B 207(4): 487

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