A THIN-LAYER AL2O3-C BETA-TL DETECTOR

High sensitivity thermoluminescence beta dosemeters based on Al2O3:C h ave been developed and tested. The detectors were developed in two con figurations: (1) a thin powder layer of Al2O3:C of surface density fro m 2 to 5 mg.cm(-2) mounted without a binder on aluminium substrates; ( 2) thin single crystals of 20 mg.cm(-2) on a Kapton substrate. The dos imetric characteristics of the dosemeters are presented. It is shown t hat by optimising the combination of the cover thickness, the thicknes s of the sensitive layer, and the substrate the thickness, a nearly fl at beta energy response can be achieved.