High dose measurements using thermoluminescence of CaSO4 : Dy

Thermoluminescence dosimetry has been very successful in monitoring the per sonnel level doses due to high sensitivity and reusability. However, these dosimeters saturate at high doses involved in radiation processing. Present investigations show that the range of high dose measurements can be increa sed by an order of magnitude by increasing the concentration of dysprosium in CaSO4:Dy. A further increase in high dose measurements is possible by co nsidering the ratio of two high temperature peaks. As the ratio of two peak s is an intrinsic property of the material, it is expected that the initial calibration of these dosimeters may not be required. This may be advantage ous at very high doses where calibration of the dosimeters is quite problem atic. Use of thermoluminescence peaks higher than 300 degrees C also make t his technique appropriate for high dose measurements at high temperatures. Published by Elsevier Science Ltd.