Daybreak 2200 OSL readers are widely used for luminescence dating applications.As the sample irradia- tion and illumination may affect discs in adjacent positions

it is critical to confirm that these factors do not introduce significant systematic errors.Effects of cross-irradiation and cross-bleaching were examined and quantified using fine-grain quartz and highly sensitive CaSO

4

:Tm dosimeters

and the irradiation offset time was measured.The cross-bleaching effect on adjacent aliquots is non-linear with no more than 15% OSL signal reduction following 10ks illumination with the power of blue LED being at 95% maximum.But at positions other than the nearest neighboring sample

almost no effect of cross-bleaching was found.The cross-talk dose

even to the nearest samples

was about 0.2‰of the applied dose

and it decreased with increasing distance from the source.Offset time of the built-in Beta source shutter is 0.22 s

which can be neglected in regular dating

and leak dose of the source can be ignored as well. Finally

measurement consistency at Position 0.5

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…and 55 of the sample tray is better than 3% in relative stan- dard deviation.