Selfdose measurements in routine personal and environmental TLD systems

Passive TLD systems are widely used to measure low doses (below 0.15 mSv/month) in personal and environmental monitoring. In order to achieve enough viability in this range it is necessary to characterize the selfdose response of the detector, including phosphor and hanger with metallic and plastic filtrations. CIEMAT has performed different selfdose response of the detector, including phosphor and hanger with metallic and plastic filtrations. CIEMAT has performed different selfdose studies in the UDO Laboratory for the most common TL materials, but this works shows the importance of selfdose in routine equipments such as Panasonic personal and environmental TLD systems. Results on measured selfdose rates show slight differences between phosphors but other parameters can be noticeable. The presence of metallic elements (filters, rings) can increase the selfdose rate more than ten times. Variations in batch production could be also appreciated