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.
infrared radioluminescence radio-phosphorescence bleaching of IRRL sensitivity cor-rection K-feldspar geochronology
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Buylaert JP, Jain M, Murray AS, Thomsen KJ and Lapp T, 2012. IR-RF dating of sand-sized k-feldspar extracts: A test of accuracy. Radiation Measurements 47(9): 759–765, DOI 10.1016/j.radmeas.2012.06.021.CrossRefGoogle Scholar
Erfurt G and Krbetschek MR, 2003. IRSAR — a single-aliquot regenerative-dose dating protocol applied to the infrared radiofluorescence (IRRF) of coarse-grain k-feldspar. Ancient TL 21(1): 35.Google Scholar
Krbetschek MR, Trautmann T, Dietrich A and Stolz W, 2000. Radioluminescence dating of sediments: Methodological aspects. Radiation Measurements 32(5): 493–498, DOI 10.1016/S1350-4487(00)00122-0.CrossRefGoogle Scholar
Lapp T, Jain M, Thomsen KJ, Murray AS and Buylaert JP, 2012. New luminescence measurement facilities in retrospective dosimetry. Radiation Measurements 47(9): 803–808, DOI 10.1016/j.radmeas.2012.02.006.CrossRefGoogle Scholar
Morthekai P, Thomas J, Pandian MS, Balaram V and Singhvi AK, 2012. Variable range hopping mechanism in band-tail states of feldspars: A time-resolved IRSL study. Radiation Measurements 47(9): 857–863, DOI 10.1016/j.radmeas.2012.03.007.CrossRefGoogle Scholar
Porat N, 2006. Use of magnetic separation for purifying quartz for luminescence dating. Ancient TL 24(2): 33.Google Scholar
Trautmann T, 2000. A study of radioluminescence kinetics of natural feldspar dosimeters: Experiments and simulations. Journal of Physics D: Applied Physics 33(18): 2304, DOI 10.1088/0022-3727/33/18/315.CrossRefGoogle Scholar
Trautmann T, Krbetschek MR, Dietrich A and Stolz W, 1998. Investigations of feldspar radioluminescence: Potential for a new dating technique. Radiation Measurements 29(3–4): 421–425, DOI 10.1016/S1350-4487(98)00012-2.CrossRefGoogle Scholar
Trautmann T, Krbetschek MR, Dietrich A and Stolz W, 1999. Feldspar radioluminescence: A new dating method and its physical background. Journal of Luminescence 85(1–3): 45–58, DOI 10.1016/S0022-2313(99)00152-0.CrossRefGoogle Scholar
Trautmann T, Krbetschek MR, Dietrich A and Stolz W, 2000. The basic principle of radioluminescence dating and a localized transition model. Radiation Measurements 32(5–6): 487–492, DOI 10.1016/S1350-4487(00)00119-0.CrossRefGoogle Scholar