Murray, A. S., Olley, J. M., 2002: Precision and Accuracy in the Optically Stimulated Luminescence Dating of Sedimentary Quartz: A Status Review, GEOCHRONOMETRIA Vol. 21, pp 1-16, 2002
The answer of your question easily can be find in internet. Here I am attaching one of them with very basic and important information regarding TL and OSL dating and hope it will be useful to you.
In addition to the reading provided above, you can't go past Aitken (1998), and Prescott and Hutton (1994) for the effect of moisture content on cosmic dose rate.
Aitken, M. J. (1998). "An introduction to optical dating: The dating of Quaternary
sediments by the use of photon-stimulated luminescence." Oxford University
Press, New York.
Prescott, J. R., and Hutton, J. T. (1994). Cosmic-ray contributions to dose-rates for
luminescence and ESR dating - large depths and long-term time variations.