| Autor: |
Anderse, C. E., Marckmann, C. J., Aznar, M. C., B&3x00F8;tter-Jensen, L., KjæR-Kristoffersen, F., Medin, J. |
| Předmět: |
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| Zdroj: |
Radiation Protection Dosimetry; 2006, Vol. 120 Issue 1-4, p7-13, 7p, 1 Diagram, 1 Chart, 5 Graphs |
| Abstrakt: |
Although the radioluminescence (RL) signal from optical fibre Al2O3:C dosemeters used in medical applications is essentially proportional to dose rate, the crystals used so far are imperfect in the sense that their RL sensitivity changes with accumulated dose. A computational algorithm has been developed that corrects for these sensitivity changes. We further report on a new system that effectively separates the RL signal generated in the crystal from fluorescence and Cerenkov emission generated in the optical fibre cable using a gating technique in connection with pulsed linear accelerator radiation beams. The dosimetry system has been used for dose measurements in a phantom during an intensity-modulated radiation therapy (IMRT) treatment with 6 MV photons. The RL measurement results are in excellent agreement (i.e. within 1%) with both the OSL results and the dose delivered according to the treatment planning system. RL signals from Al2O3:C can be used for real-time dose rate measurements with a time resolution of ~0.1 s and a spatial resolution only limited by the size of the detector (<0.5 mm). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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