Study of dose rate profile at sample disks in a Risø OSL single-grain attachment system

A continuous drop of the beta dose rate with increasing radial distance from the centre of the disk was observed in the experiments, indicating that grains located in the central part of the disk absorbed a higher dose than those placed in the outer region of the hole matrix. This experimental dose profile pattern was also confirmed by the results of the Monte Carlo calculation. It can therefore be concluded that different calibration factors, depending on the grain location, should be applied in order to improve the reliability of equivalent dose assessment using single-grain OSL measurements.