Spatial variation of dose rate from beta sources as measured using single grains

摘要: Dose rates across the centre of a 9.7 mm diameter aluminium disc were measured using 10 x array single grains quartz held in holes drilled with 600 µm separation. The dose obtained by measuring OSL signals from that previously had been given known gamma and comparing them those following increasing doses beta source 5 above surface. patterns rate for four 90 Sr/ Y sources. Two found to produce non-uniform at surface, one showing factor two 7.6 area containing array. implications both grain multiple measurements are discussed.