A coarse Bayesian approach to evaluate luminescence ages

Abstract

This paper develops a simplified Bayesian approach to evaluate a luminescence age. We limit our purpose to the cause-effect relationship between the age and the accumulated dose. The ac-cumulated dose is given as a function of the age and several others parameters: internal radionuclides contents, gamma dose rate, cosmic dose rate, alpha efficiency, wetness, conversion factors, wetness coefficients, fading rate and storage time. The age is the quantity we are looking for. Bayes' theorem expresses the changes on the probability distribution of age due to the luminescence study. The in-formation before study (prior) comprises what is previously known about the age and the archaeolog-ical model (cultural period, stratigraphic relations, type, etc.) as well as the parameters of the physical model. The accumulated dose consists in the data describing the measurement. The various stages of Bayesian approach were implemented using the software WinBugs. Simulated data sets were used in various models. We present various small models representing typical exam-ples encountered in luminescence dating. © 2013 Silesian University of Technology, Gliwice, Poland.