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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
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.
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.
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.
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.
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.
Porat N, 2006. Use of magnetic separation for purifying quartz for luminescence dating. Ancient TL 24(2): 33.
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.
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.
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.
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.
Author information
Authors and Affiliations
Corresponding author
About this article
Cite this article
Varma, V., Biswas, R.H. & Singhvi, A.K. Aspects of Infrared Radioluminescence dosimetry in K-feldspar. Geochron 40, 266–273 (2013). https://doi.org/10.2478/s13386-013-0125-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.2478/s13386-013-0125-6