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Abstract
Radioluminescence (RL) from aluminium oxide (Al 2O 3:C) crystals and organic scintillators such as the blue-emitting BCF-12 can be used for precise real-time dose rate measurements during radiation therapy of cancer patients. Attaching the dosimeters to thin light-guiding fiber cables enables in vivo use. The light signal is detected by a photomultiplier tube (PMT). Unfortunately Cerenkov light and fluorescence are also generated in the fiber cable itself during irradiation, and this so-called stem effect can be significant compared with the dosimeter signal. In the case of Al 2O 3:C, this problem can be circumvented for pulsed beams due to the long life-time of the main luminescence center. In contrast, chromatic removal seems to be the most effective method for organic scintillators, but is found to yield some experimental complexities. In this paper, we report on dose rate measurements using BCF-12 as well as Al 2O 3:C. We focus our attention on comparing the efficiency of stem effect removal of the two materials, as well as the accuracy of the resulting depth–dose curves.
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