Instability of luminescence responses in feldspar-and quartz-based paleo-dosimeters |
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Authors: | I Jaek A Molodkov V Vasilchenko |
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Institution: | (1) Institute of Geology, Tallinn Technical University, 5 Ehitajate St., Tallinn, 19086, Estonia;(2) Tartu University, Tartu, Estonia |
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Abstract: | It is shown that repeated cycles of laboratory irradiation/heating, being a component part of the majority of luminescent
dating protocols, cause a change in sensitivity of quartz and feldspars. As a rule, these changes relax within one month and
the sensitivity tends toward its initial value. The analysis of experimental data confirms that these phenomena are caused
by thermo-and radiation-induced ionic processes and cannot be connected to tunneling. In addition, ionic processes cause an
increase in the sensitivity of quartz on heating to temperatures approaching that of the phase transition in quartz (573°C).
The dose sensitivity (stored or liberated light sum per unit absorbed dose) of quartz starts growing even when it is moderately
heated (to about 300°C), which is typical of dating procedures.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 6, pp. 819–824, November–December, 2008. |
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Keywords: | luminescence dating fading ionic processes tunneling processes |
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